JP7143692B2 - Body motion detector and radiography system - Google Patents

Description

The present invention relates to a body motion detection device and a radiation imaging system provided with this device.

Movie shooting (also called serial shooting), in which radiation exposure and image data generation are repeated multiple times with a single operation of the exposure switch, takes longer than still image shooting (several seconds to tens of seconds). During imaging, the subject may move (body movement may occur). If there is body movement of the subject during moving image capturing, the obtained moving image data may not be usable for diagnosis. In that case, it becomes necessary to perform another imaging, and the subject is unnecessarily exposed to radiation for one imaging.

In order to minimize such useless radiation exposure, it is desirable to be able to immediately stop imaging when the subject moves during moving image imaging. Therefore, conventionally, techniques such as those described in Patent Documents 1 and 2 have been proposed.
In Patent Literature 1, the difference between an image output during video shooting and an image output at the previous timing is obtained for each of a plurality of areas, and the presence or absence of body movement in each area is determined based on the difference. A technique is described in which radiation irradiation is stopped when it is determined that there is body movement in a region.
Further, Japanese Patent Application Laid-Open No. 2002-200000 describes a technique for superimposing the outline of a subject extracted from an image taken by a camera on an image taken by the camera afterward.

Japanese Patent Application Laid-Open No. 2007-082907 Japanese Patent No. 6056974

In the technique described in Patent Document 1, since the entire image is used as a comparison target, a region other than the region of interest in which the diagnosis target such as the lungs and heart is photographed (a region that does not affect diagnosis even if there is body movement is photographed). Also, if body motion is detected in the
In addition, body movements include actions to be diagnosed, such as expansion and contraction of the lungs and beating of the heart. It cannot be determined whether it is body movement or not.
In addition, the technique described in Patent Document 2 is to take an image with a camera after the positioning of the subject is completed, extract the contour, and superimpose display of the image and the contour until the irradiation of radiation is started. ing. That is, the technique described in Patent Document 2 is for still image shooting, and is not designed to detect body movement during moving image shooting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to enable detection of body movements that affect diagnosis when imaging a moving image of a subject.

In order to solve the above problems, the present invention
an acquisition means for acquiring a plurality of image data from an imaging means capable of repeatedly generating image data of a subject based on one imaging operation;
site designating means for designating a specific site that is required not to cause body movement different from the specific body movement to be diagnosed, for each image data acquired by the acquisition means;
motion detection means for detecting motion of the specific part designated by the part designation means based on a plurality of image data;
body movement determination means for determining the presence or absence of a body movement different from the specific body movement based on the movement detected by the movement detection means ;
The movement detection means detects the amount of movement, which is the magnitude of movement of the specific part, as a component in a first direction, which is the direction in which the specific body movement is performed, and a component in a second direction different from the first direction. , and detected separately,
The body motion determining means detects when the amount of motion in the first direction detected by the motion detecting means exceeds a first threshold for comparison with the amount of motion in the first direction, or when the motion detecting means Body motion different from the specific body motion when the detected amount of motion in the second direction exceeds a second threshold different from the first threshold for comparison with the amount of motion in the second direction It is characterized by determining that there was

According to the present invention, it is possible to detect body movements that affect diagnosis when capturing a moving image of a subject.

1 is a block diagram showing the configuration of a radiation imaging system according to an embodiment of the first invention; FIG. 2 is a block diagram showing the configuration of a radiographic apparatus included in the radiographic imaging system of FIG. 1; FIG. 2 is a perspective view of a radiographic apparatus provided in the radiographic system of FIG. 1; FIG. 2 is a side view showing an example of the configuration of the radiation imaging system of FIG. 1; FIG. FIG. 10A is a side view and a plan view of a radiographic apparatus included in a radiographic imaging system according to a modification of the same embodiment; 2 is a ladder chart showing the flow of imaging using the radiation imaging system of FIG. 1; It is a block diagram showing the structure of the radiography system based on 1st embodiment of 2nd invention. FIG. 8 is a block diagram showing the configuration of a body motion detection device included in the radiation imaging system of FIG. 7; It is an example of a specific part designated by the body motion detection device of FIG. FIG. 10 is a block diagram showing the configuration of a radiation imaging system according to a second embodiment of the second invention; FIG. 1 is a side view of a radiation imaging system according to an example; FIG. 1 is a side view showing part of a radiation imaging system according to an example; FIG. It is a graph for explaining the principle of the embodiment. 1 is a side view showing part of a radiation imaging system according to an example; FIG. 1 is a perspective view showing part of a radiation imaging system according to an embodiment; FIG. 1 is a side view showing part of a radiation imaging system according to an example; FIG. It is a side view showing a part of radiography system which concerns on the same Example. 1A and 1B are a plan view and a side view showing a radiographic device included in the radiographic imaging system according to the same embodiment, and a radiographic image captured by the system; FIG. 1A and 1B are a plan view and a side view showing a radiographic device included in the radiographic imaging system according to the same embodiment, and a radiographic image captured by the system; FIG. It is a conceptual diagram for demonstrating the principle of the modification of the same Example. It is a side view showing the radiography apparatus with which the radiography system which concerns on the same Example is provided. 1 is a conceptual diagram for explaining the principle of a radiation imaging system according to an embodiment; FIG. 1 is a perspective view showing a radiographic apparatus included in a radiographic imaging system according to an embodiment; FIG. FIG. 2 is a plan view showing a radiographic device included in the radiographic system according to the embodiment; FIG. 2 is a plan view showing a part of a radiographic apparatus included in the radiographic imaging system according to the embodiment; 1A and 1B are a plan view and a side view showing a radiographic apparatus included in a radiographic imaging system according to an embodiment; FIG. 1 is a perspective view for explaining an imaging method using a radiation imaging system according to an embodiment; FIG. 2A and 2B are a plan view and a cross-sectional view of a marker M included in the radiography system according to the embodiment; FIG. 1 is a side view showing a radiation imaging system according to an example; FIG. 1 is a side view showing a radiation imaging system according to an example; FIG. 1 is a perspective view for explaining an imaging method using a radiation imaging system according to an embodiment; FIG. It is a top view showing the radiography apparatus with which the radiography system which concerns on the same Example is equipped. It is a side view showing the radiography apparatus with which the radiography system which concerns on the same Example is equipped. 1 is a perspective view for explaining an imaging method using a radiation imaging system according to an embodiment; FIG. It is a conceptual diagram for explaining the principle of the embodiment. 4 is a flowchart of processing executed by the radiation imaging system according to the embodiment; FIG. 11 is a flowchart of processing executed by a radiation imaging system according to a modification of the embodiment; FIG. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. 1 is a perspective view of a radiation imaging system according to an example; FIG. 38 is a block diagram showing the configuration of the radiation imaging system of FIG. 37; FIG. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. 1A and 1B are diagrams for explaining an imaging method using a radiation imaging system according to an embodiment, and a front view of a display unit included in the system; FIG. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. FIG. 11 is a flowchart of processing executed by a radiation imaging system according to a modification of the embodiment; FIG. 1 is a block diagram showing the configuration of a radiation imaging system according to an example; FIG. 4 is a timing chart showing the operation of part of the radiation imaging system according to the embodiment; 1A and 1B are a side view and a perspective view of a partial configuration of a radiation imaging system according to an embodiment; FIG. 4 is a flowchart of processing executed by the radiation imaging system according to the embodiment; 1 is a side view showing a radiation imaging system according to an example; FIG. 1A and 1B are a side view and a perspective view of a partial configuration of a radiation imaging system according to an embodiment; FIG. 1 is a side view of a partial configuration of a radiographic imaging system according to an embodiment; FIG. 4 is a flowchart of processing executed by the radiation imaging system according to the embodiment; It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system based on the modification of the same Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. 1 is a side view of a radiation imaging system according to an example; FIG. < Figure 66 >It is the block diagram which displays the constitution of the radiation imaging system. 1 is a side view showing a radiation imaging system according to an example; FIG. It is a figure for demonstrating the conventional imaging method. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. 1 is a side view showing part of a radiation imaging system according to an example; FIG. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. It is a figure for demonstrating the imaging method using the radiography system which concerns on an Example. FIG. 75 is a plan view of a marker used in imaging using the radiation imaging system of FIG. 74;

<First invention embodiment>
First, an embodiment of the first invention will be described with reference to the drawings. However, the present invention is not limited to the illustrated examples.

[Configuration of radiation imaging system]
First, the outline of the radiation imaging system 100 of the first embodiment will be described. FIG. 1 is a block diagram of a radiation imaging system 100 of this embodiment.

As shown in FIG. 1, the radiation imaging system 100 of this embodiment includes a system main body 100A and one or a plurality of radiation imaging apparatuses (hereinafter referred to as imaging apparatuses 100B).
In addition, the radiography system 100 is connected to an image analysis device (not shown), a radiology information system (RIS), an image archiving and communication system (PACS), etc., by wire or wirelessly. It is possible.

Further, the radiography system 100 of the present embodiment can be a mobile system for taking a radiographic image by going to a subject S (subject) who is difficult to move, for example. In that case, it is preferable that the system main body 100A is provided with wheels 1a and configured as a mobile medical vehicle, and the radiation imaging apparatus 100B is of a panel type (portable type).
In the following, an example in which the radiation imaging system 100 is configured to be mobile will be described. Therefore, in the following description, the system main body 100A will be referred to as the medical vehicle 100A.
The radiation imaging system 100 of this embodiment can also be used by being installed in, for example, an imaging room of a hospital.

The mobile car 100A sets various imaging conditions, irradiates the subject S and the imaging device 100B behind it with radiation, performs predetermined image processing on the image data input from the imaging device 100B, and converts the image. It is configured to be able to display and output image data to the outside.
The details of the medical care vehicle 100A will be described later.

The imaging device 100B is communicably connected to the medical vehicle 100A by wire or wirelessly.
The imaging device 100B can generate image data of a radiographic image by receiving radiation from the outside (the medical care vehicle 100A).
Details of the imaging device 100B will also be described later.

The radiation imaging system 100 of the present embodiment configured as described above irradiates the subject S placed in front of the imaging device 100B with radiation (such as radiation) from the medical vehicle 100A, thereby capturing a still image of the subject S. and at least one of serial shooting.
The serial imaging in this embodiment means that the subject S is repeatedly imaged based on one imaging operation (depression of an exposure switch 31a, which will be described later). In addition to irradiation, the imaging device 100B repeats charge accumulation and signal value readout multiple times in a short time (repeatedly generating image data of the subject S) to obtain a series of multiple images.
Hereinafter, a series of multiple images obtained by serial imaging will be referred to as a dynamic image, and individual images forming the dynamic image will be referred to as frame images.

[Electrical configuration of rounding car]
Next, an electrical configuration of the medical cart 100A that constitutes the radiation imaging system 100 will be described.
The medical care vehicle 100A includes a housing 1 having wheels 1a, an imaging control unit 2, a radiation irradiation device 3, a console 4, a power supply unit 5, and the like.

The imaging control unit 2 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a storage unit, a crystal oscillator, and the like (not shown).
The CPU of the imaging control unit 2 reads the system program and various processing programs stored in the storage unit, develops them in the RAM, and controls the operation of each unit of the medical vehicle 100A according to the developed programs.
The storage unit of the imaging control unit 2 is composed of a non-volatile semiconductor memory, hard disk, or the like, and stores various programs executed by the imaging control unit 2 and parameters necessary for executing processing by the programs. It is also possible to store data such as processing results.

The communication unit 21 includes a wired communication interface (hereinafter referred to as a wired communication IF) 21a for performing wired communication with the imaging device 100B by inserting a communication cable extending from the imaging device 100B, and a wireless interface (hereinafter referred to as a wired communication IF) 21a for performing wireless communication with the imaging device 100B. It has a wireless communication interface (hereinafter referred to as IF) 21b, and the connection method can be switched between wired and wireless based on a control signal from the CPU.

The radiation irradiation apparatus 3 includes an operation unit 31, a radiation control unit 32, a high voltage generator (high voltage generator) 33, a radiation source 34 (tube) 34, a collimator 35, and the like.

The operation unit 31 is configured to be operable by the user, such as a button and a touch panel, and detects the operation content of the user (the type of button pressed, the contact position of the finger or the touch pen, etc.) and uses it as operation information. It is designed to output to the radiation control unit 32 .
Further, an exposure switch 31 a for instructing the irradiation of the radiation X by the user is connected to the operation unit 31 . The exposure switch 31a is a two-stage switch.
Then, the operation unit 31 detects what stage the exposure switch 31a has been operated, and outputs it to the radiation control unit 32 as exposure switch information.
Note that the exposure switch 31a may be a remote-operable switch that is connected to the medical vehicle 100A by wire or wirelessly. In this way, the user can control the irradiation of radiation from a place remote from the radiation irradiation device 3 of the medical cart 100A.

Based on operation information from the operation unit 31, the radiation control unit 32 controls various imaging conditions (conditions related to the subject S such as the site to be imaged and physique, radiation such as tube voltage, tube current, irradiation time, and current time product). It is possible to set the conditions related to the irradiation of
Further, the radiation control unit 32 transmits control information for instructing the start of voltage application (radiation irradiation) to the high voltage generator 33 based on the reception of the exposure switch information.

Upon receiving the control signal from the radiation control unit 32 , the high-voltage generator 33 applies a voltage to the radiation source 34 according to preset radiation irradiation conditions.
In addition, since it is conceivable that the mobile inspection car 100A performs imaging in the ward where the subject S is hospitalized, not in an imaging room where radiation leakage is prevented to the outside, the radiation output of the radiation irradiation device 3 is Imaging may be performed by weakening the radiation irradiation device 3 fixed in the imaging room. In this case, the high voltage generator 33 may be configured to operate with weaker power than the one fixed in the imaging room.

The radiation source 34 has, for example, a rotating anode or filament (not shown). Then, when a voltage is applied from the high voltage generator 33, the filament emits an electron beam corresponding to the voltage toward the rotating anode, and the rotating anode generates a dose of radiation X corresponding to the intensity of the electron beam. ing.
Specifically, the radiation source 34 emits radiation continuously when voltage is continuously applied from the high-voltage generator, and emits radiation in pulses when a voltage in pulses is applied. ing.
That is, the radiation irradiation apparatus 3 of the present embodiment is compatible with all of still image photography, continuous irradiation serial photography, and pulse irradiation serial photography.

A collimator 35 is provided at the irradiation port of the radiation source 34 (on the optical path of the radiation X).
The collimator 35 has, for example, a plurality of shielding blades arranged to form rectangular openings above, below, left and right of the optical path of the radiation X, and an adjustment mechanism (not shown) for moving the shielding blades. The collimator 35 can adjust the irradiation field of radiation by changing the positions of the shielding blades with the adjustment mechanism based on the control signal from the radiation control unit 32 .

The console 4 is configured as a computer or a dedicated control device, and includes a control section, a storage section, an operation section, etc. (not shown).
Then, when the console 4 receives the image data from the imaging device 100B, it automatically or based on a predetermined operation of the user performs image processing such as predetermined correction processing on the image data, and generates a processed image. It's like
The term “image processing” used herein refers to processing for adjusting the visibility of an image by changing the brightness, density, etc. of the image.

Also, the console 4 determines the system configuration, more specifically, the connection form between itself and the image analysis apparatus.
The console 4 also compresses the processed image data to generate compressed image data, or thins out some frame image data from the processed image data to generate thinned image data, based on the determination result of the system configuration. It is possible to generate
Also, the console 4 can transmit at least one of processed image data, compressed image data, and thinned image data to the image analysis device via the communication unit 42 .

The display unit 41 is configured by a monitor such as an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube), and displays display signals input from the control unit of the console 4 or input from the imaging control unit 2 via the console 4. The radiographing order information and the photographed image are displayed according to the instruction of the display signal.
Also, the display unit 41 displays a display image based on the processed image data.
In addition, the display unit 41 may be connected to the medical vehicle 100A by wire or wirelessly so that remote display is possible. In this way, the user can confirm various information from a place away from the radiation irradiation device 3 of the medical care vehicle 100A.
Also, a sub-monitor other than the display unit 41 may be connected by wire or wirelessly.

The communication unit 42 includes a wired communication IF 42a for performing wired communication with the outside by inserting a communication cable extending from the image analysis device, and a wireless communication IF 42b for performing wireless communication with the outside. , it is possible to switch the connection method between wired and wireless.

The power supply unit 5 includes a battery (built-in power supply) 51, a power distribution unit 52, a power cable 53, and the like.
The battery 51 is configured to be able to supply the power stored in itself to the power distribution unit 52 and store the power supplied from the power distribution unit 52 .
The power distribution unit 52 has a power cable 53 with a plug 53a at its tip, and is configured to receive power from the outside by inserting the plug 53a into a nearby outlet.
The power distribution section 52 distributes the power supplied from the battery 51 or the outside to each section of the medical care vehicle 100A.

Although the wiring for distributing electric power from the power distribution unit 52 to each unit is omitted in FIG. It is
Voltages that the power distribution unit 52 can handle are, for example, 100 V and 200 V, and frequencies that it can handle are 50 Hz and 60 Hz. Therefore, it is possible to receive power supply from both a domestic power source and a commercial power source.
Note that the above voltage and frequency are an example when the radiation imaging system 100 is used in Japan, and by changing the specifications of the power distribution unit 52, it is possible to support use in other countries and regions. is.

[Configuration of radiation imaging apparatus]
Next, a specific configuration of the imaging device 100B included in the radiation imaging system 100 will be described. FIG. 2 is a block diagram showing the electrical configuration of the imaging device 100B, and FIG. 3 is a perspective view of the imaging device 100B.
FIG. 3 illustrates a panel-shaped portable radiographic imaging apparatus 100B, but the present invention can also be applied to a so-called stationary radiographic imaging apparatus integrally formed with a support stand or the like. Applicable.

The imaging device 100B according to the present embodiment is a so-called indirect type that converts emitted radiation (radiation or the like) into electromagnetic waves of other wavelengths such as visible light and obtains electric signals, and is shown in FIGS. As shown, in addition to the housing 61, a control unit 62, a radiation detection unit 63, a reading unit 64, a communication unit 65, a storage unit 66, an atmospheric pressure sensor 67, a temperature sensor 68, each unit 61 to A bus 69 connecting 68 is provided.

The control unit 62 is composed of a CPU (Central Processing Unit), a RAM (Random Access Memory), and the like. Upon receipt of a control signal or the like from an external device such as the console 4, the CPU of the control unit 62 reads out various programs stored in the storage unit 66, develops them in the RAM, and executes the programs according to the developed programs. Various kinds of processing are executed, and the operation of each unit of the photographing apparatus 100B is centrally controlled.

The radiation detection unit 63 is composed of a substrate on which pixels each having a radiation detection element or a switching element that generates an electric charge corresponding to the dose of radiation X upon receiving the radiation X are arranged two-dimensionally (in a matrix).
The radiation detection unit 63 incorporates a scintillator or the like, converts the emitted radiation X into light of other wavelengths such as visible light with the scintillator, and generates charges according to the converted light (so-called indirect type). ), or a so-called direct type that directly generates charges from the radiation X without using a scintillator or the like.

The reading unit 64 is configured to read the amount of charge emitted from each pixel as a signal value and generate image data from a plurality of signal values.
The communication unit 65 is configured to be able to receive various control signals, various data, and the like from external devices, and transmit various control signals, generated image data, and the like to external devices.
The storage unit 66 is composed of a non-volatile semiconductor memory, a hard disk, or the like, and stores various programs executed by the control unit 62 and parameters required for execution of processing by the programs.
Further, the storage unit 66 can store image data generated by the reading unit 64 and various data processed by the control unit 62 .
The atmospheric pressure sensor 67 and temperature sensor 68 will be described later.

A power switch 61a, an operation switch 61b, an indicator 61c, a connector 61d, and the like are provided on the side surface of the housing 61, as shown in FIG.
One of the plurality of surfaces of the housing 61 is a radiation entrance surface 61e.
Here, the surface of the housing 61 will be described as the radiation incident surface, but the surface of the substrate constituting the radiation detection unit 63 or the surface of the scintillator may be used as the radiation incident surface.

In the imaging apparatus 100B configured in this manner, when the control unit 62 turns off each switch element of the radiation detection unit 63 and is exposed to radiation, charges corresponding to the dose of radiation are accumulated in each pixel. . Then, when the control unit 62 turns on each switch element to release charge from each pixel, the reading unit 64 converts each charge amount into a signal value and reads it out as image data.

[Structure of moving parts of the mobile inspection car]
Next, the movable portion of the medical cart 100A will be described. FIG. 4 is a side view of the medical cart 100A and the imaging device 100B.

As shown in FIG. 4, the medical cart 100A includes a medical cart main body 101, an arm 102, and a radiation irradiation unit 103. As shown in FIG.
In this embodiment, the imaging control unit 2 , the console 4 , and the power supply unit 5 are housed in the medical vehicle main body 101 .
In this embodiment, the radiation irradiation unit 103 has a case 103a, the radiation source 34 of the radiation irradiation device 3 is stored in this case 103a, and the collimator 35 is located at the end of the case 103a. attached to the
A power supply line (not shown) that connects the high voltage generator 33 of the radiation irradiation device 3 and the radiation source 34 is passed through the arm 102 .

The lower end of the arm 102 is pivotally supported by the medical vehicle main body 101 by a first rotation axis A1 that extends in the horizontal direction of the medical vehicle main body 101 (for example, the direction orthogonal to the paper surface of FIG. 4), so that the arm 102 can rotate. It's becoming That is, it is possible to move the upper end of the arm 102 up and down.
The size of the angle (hereinafter referred to as the arm rotation angle α) formed by the vertical line Lv and the straight line extending in the extending direction of the arm 102 (hereinafter referred to as the arm axis Aa) is such that the intermediate portion and the tip portion of the arm 102 do not touch the medical vehicle main body 101 or the floor. It is possible to set any value within the non-contact range.
The pivotal position of the lower end of the arm 102 to the medical vehicle body 101 is not particularly limited, but as shown in FIG. This is preferable from the viewpoint of securing a wide shooting space below.
Here, although the size of the angle formed by the vertical line Lv and the arm axis Aa is defined as the arm rotation angle α, the arm rotation angle may be defined with reference to another line or plane (for example, a horizontal plane).

The case 103a of the radiation irradiation unit 103 is rotatably supported by the tip of the arm 102 by means of a second rotation axis A2 extending parallel to the _first rotation axis A1 at the upper end of the arm 102. . That is, it is possible to change the direction of the radiation irradiation port (collimator 35).
The size of the angle formed by the arm axis Aa and a straight line connecting the focus F of the radiation emitted by the radiation source 34 and the center C of the aperture formed by the shielding blades in the collimator 35 (hereinafter referred to as the optical axis Ao of the radiation) ( Hereinafter, the irradiation unit rotation angle β) can be set to any value within a range in which the case 103 a and the collimator 35 do not come into contact with the arm 102 .

Although FIG. 4 illustrates the case where the focal point F of the radiation is positioned between the second rotational axis A2 and the collimator 35, even if the focal point F is positioned on the extension line of the second rotational axis A2 Alternatively, the second rotation axis A2 may be positioned between the focal point F and the collimator 35. Also, the second rotation axis A2 may not be on the extension line of the optical axis Ao of the radiation.
Also, here, the size of the angle formed by the arm axis Aa and the optical axis Ao of the radiation is defined as the irradiation unit rotation angle β. may be defined.

A first angle detection means for detecting the magnitude of the arm rotation angle α is provided near the _first rotation axis A1, and the magnitude of the irradiation unit rotation angle β is provided near the second rotation axis A2. A second angle sensing means is provided for sensing.
As such angle detection means, for example, a potentiometer using a variable resistor or a rotary encoder using a pulse counter can be used.
Each angle detection means transmits the detected arm rotation angle α and irradiation unit rotation angle β to the imaging control unit 2 and the console 4 at any time, and the numerical values are displayed on the display unit 41 . It's like

[Radiation irradiation angle and focal height]
In the medical cart 100A, the distance from the _first rotational axis A1 to the second rotational axis A2 is d2 _, the distance from the _second rotational axis A2 to the focal point F of radiation is d3, and the predetermined reference in the medical cart body 101 Let h1 be the height from the height (hereafter referred to as the device reference height) to the _first rotation axis A1. These values are known values at the time of designing and manufacturing the medical cart 100A.
Then, the magnitude of the angle formed by the optical axis Ao of the radiation and the vertical line Lv (hereinafter referred to as the radiation irradiation angle θ) is the height from the apparatus reference height to the focus F of the radiation (hereinafter referred to as the focus The height h _x ) is represented by the following formula (2).
θ=180°−(α+β) (1)
h _x = h ₁ + d ₂ cos α−d ₃ cos θ (2)
Here, although the size of the angle formed by the optical axis Ao of the radiation and the vertical line Lv is defined as the radiation irradiation angle θ, it may be defined based on another specific plane or line.
Also, here, the explanation is given using "degree" as the unit of the angle, but in the calculation of the trigonometric function, the unit may be converted to a unit such as radian as appropriate.

The imaging control unit of the medical vehicle 100A or the control unit of the console 4 performs the above-described calculations based on the arm rotation angle α and the irradiation unit rotation angle β detected by the first and second angle detection means, thereby It has the function of detecting the height of the source. That is, the imaging control section or the control section of the console 4 constitutes the first height detection means in the present invention.

As a conceptual diagram, FIG. 4 exemplifies a case where only rotation is performed with a rotation axis that is a straight line perpendicular to the plane of FIG. 4 . However, it is not necessary to limit the rotation direction to that shown in FIG. 4, and it is also possible to combine a rotation mechanism having a rotation shaft that rotates in other directions (for example, the direction along the plane of FIG. 4). Even in such a case, the radiation irradiation angle θ and the focal height _hx can be obtained, for example, by obtaining the distances between the adjacent rotation axes and calculating the angles formed by the planes orthogonal to the rotation axes. It is possible to arithmetically obtain by calculating each distance and adding each distance in consideration of the size of the angle formed by each plane.
Moreover, in FIG. 4, the example which has 2nd rotating shaft A2 on arm axis|shaft Aa was shown. However, the present invention does not have to be limited to such a configuration. It may be configured such that a plurality of rotation axes are positioned. Even in the case of such a configuration, the distance (the amount of deviation) between the arm axis Aa and the other rotation axis can be grasped at the design and manufacturing stages. , .theta., _hx can be calculated arithmetically.
Also, in addition to the rotation mechanism, one or a plurality of extension mechanisms and elevating mechanisms can be combined. Even in such a case, the radiation irradiation angle θ and the focal point height _hx can be calculated arithmetically, for example, by taking into account the increase or decrease in the distance due to the extension mechanism or the lifting mechanism to the distance between the rotation axes. It is possible to ask for

[Arrangement height of imaging device]
The photographing device 100B, as also shown in FIG. 2, has an atmospheric pressure sensor 67 that measures the atmospheric pressure at the height at which it is located.
The atmospheric pressure sensor 67 may be built in the photographing device 100B, or may be provided outside the housing.
Moreover, from the viewpoint of avoiding reflection in the image, the air pressure sensor 67 is preferably arranged on the peripheral portion of the substrate constituting the radiation detection section 63 or on the back side of the substrate.

In addition, as shown in FIG. 2, the imaging device 100B also includes a temperature sensor 68 for measuring the temperature around the imaging device 100B.
The mounting position of the temperature sensor 68 is not particularly limited, but it is preferable to dispose it away from a heat-generating portion of the imaging device 100B.

Between the atmospheric pressure P measured by the atmospheric pressure sensor 67, the temperature (air temperature) T measured by the temperature sensor 68, and the installation height h of the photographing device 100B, for example, the relationship represented by the following formula (3) holds. .
h={((P ₀ /P) ^(1/5.257) −1)×(T+273.15)}/0.0065 (3)
Here, _P0 is the reference atmospheric pressure at the reference height such as sea level.

The imaging control unit of the medical care vehicle 100A or the control unit of the console 4 performs the above calculation based on the measured value (air pressure P) measured by the atmospheric pressure sensor 67 and the measured value (temperature T) measured by the temperature sensor 68. Thus, it has a function of detecting the height of the imaging device 100B. That is, the imaging control section or the control section of the console 4 constitutes the second height detection means in the present invention.
Note that the calculation of the arrangement height h may be performed within the imaging device 100B.

By the way, the reference atmospheric pressure _P0 changes according to weather changes. Therefore, it is necessary to correct the measured atmospheric pressure according to the weather conditions at the time of measurement.
As a correction method, for example, a specific measurement value measured by the atmospheric pressure sensor 67 when the photographing device 100B is placed at a specific position is stored, and the height of the photographing device 100B detected based on the specific measurement value is corrected. There is a way. Specifically, a calibration unit on which the imaging device 100B can be mounted is provided in a portion of the medical cart 100A at a specific height (for example, the medical cart body 101), and the air pressure sensor 67 when the imaging device 100B is accommodated therein. and the measured value by the temperature sensor 68 is stored as a specific measured value.
By doing so, the medical cart 100A is provided with the storage means of the present invention, and the height of the photographing device 100B is the air pressure and temperature measured at that height, and the air pressure measured when placed on the calibration unit. And based on the temperature, it can be calculated as a relative height with reference to the calibration section.

Assuming that the height of the calibration section is h _t and the air pressure in the calibration section is P _t , h _t is expressed by the following equation (4).
h _t = {((P ₀ /P _t ) ^(1/5.257) −1) × (T + 273.15)}/0.0065 (4)
Further, from the above formula (4), the reference pressure P0 is represented by the following formula ( ₅ ).
P ₀ =P _t [{0.0065 h _t ^{/(T+273.15)}+1} ] 5.257 (5)

Here, if h _t =0 in order to calculate the height at which calibration is performed, then P ₀ =P _t .
For this reason, the relative height h _diff from the height at which calibration is performed is calculated using the pressure P _t measured at the height at which calibration is performed and the pressure P measured at an arbitrary height, using the following formula ( 6) can be expressed as follows.
h _diff ={((P _t /P) ^(1/5.257) −1)×(T+273.15)}/0.0065 (6)
For example, if the device reference height is set to the height at which calibration is performed, h _diff =h _p .

Although the case where the height hp of the photographing device _100B is obtained from the measurement value of one air pressure sensor 67 has been described as an example, the photographing device 100B is provided with a plurality of air pressure sensors 67, and the measurement of each air pressure sensor 67 is performed. It can also be obtained from the value. Specifically, the portion provided with the atmospheric pressure sensor 67 is defined as the _first portion P1, and the _second portion P2, which is different from the _first portion P1, measures the atmospheric pressure at the height at which it is located. A _two -atmospheric sensor 67A is provided, and a second temperature sensor 68A is provided. It has a function of detecting the height of the _two parts P2. Then, based on the height of the _first part P1 and the height of the _second part P2, for example, an average value of each height is calculated, or an arithmetic means such as a weighted average considering the arrangement of each atmospheric pressure sensor 67 can be used to calculate the height of a part other than the _first part P1 and the _second part P2 in the imaging device 100B, and use it as the height of the imaging device 100B.
Alternatively, a gravity sensor may be installed in the photographing device 100B to correct the calculated angle value of the photographing device 100B from the atmospheric pressure sensor 67. FIG.

[SID]
The height difference _hs between the focus F of the radiation and the _imaging device _100B shown in FIG. be done.
h _s =h _x -h _p (7)
Therefore, SID, which is the distance from the focus F of the radiation to the radiation incident surface of the imaging device 100B, is obtained by the following formula using the height difference hs calculated here and the radiation irradiation angle _θ calculated by the above method. (8).
SID=hs/cos _θ (8)

Based on the detected height of the radiation source and the height of the imaging device 100B, the radiography control unit of the medical vehicle 100A or the control unit of the console 4 determines the distance from the focal point F of the radiation generated by the radiation source 34 to the imaging device 100B. It has a function to calculate That is, the photographing control section or the control section of the console 4 constitutes the distance calculation means in the present invention.
Also, the console 4 displays the calculated distance on the display unit 41 . That is, the console 4 and the display unit 41 constitute display means in the present invention.

[Method for calculating arrangement angle of photographing device]
Next, a method of calculating the angle of the radiation incident surface of the imaging device 100B will be described.
When there are two different parts P ₁ and P ₂ located along the radiation incidence plane in the imaging apparatus 100B, the distance between these two parts is d _p , and the distance between the first part P ₁ and the second part P ₂ is Assuming that the height difference is h _p2 , the magnitude of the angle formed by the radiation incident surface of the imaging device 100B and the horizontal plane (hereinafter referred to as incident surface inclination angle θ _p ) is expressed by the following equation (9).
θ _p =sin ⁻¹ (h _p2 /d _p ) (9)
Although the angle formed by the plane of incidence of radiation and the horizontal plane is defined as the radiation irradiation angle θ here, it may be defined with reference to another specific plane or line.

_In order to calculate this incident surface _inclination angle _θp , for example, as shown in _FIG . , is provided with a second atmospheric pressure sensor 67A for measuring the atmospheric pressure at the height at which it is located, and is provided with a temperature sensor 68, and detects the height of the _first portion P1 by performing the above-described calculation, It has a function of detecting the height of the _second portion P2 based on the measured value measured by the atmospheric pressure sensor 67 .
Further, the imaging control unit of the medical cart 100A or the control unit of the console 4 has a function of calculating the incident plane inclination angle _θp based on the detected height of the _first part P1 and the height of the _second part P2. have. That is, the imaging control section of the medical cart 100A or the control section of the console 4 constitutes angle calculation means in the present invention.

Two temperature sensors 68 may be arranged in the same manner as the atmospheric pressure sensors 67 and 67A, but one temperature measuring device may be used as a representative. Further, the imaging apparatus 100B may reach a temperature different from the temperature of the ambient air due to operation and heat transfer from the subject S. Therefore, the temperature of the temperature detection means arranged in the other part of the photographing device 100B may be used as the ambient air temperature.

In certain imaging techniques, radiation is preferably applied to the imaging apparatus 100B so that the optical axis Ao of the radiation is orthogonal to the radiation incident surface. On the other hand, in other imaging procedures, it may be desirable to irradiate the imaging apparatus 100B with radiation such that the optical axis Ao of the radiation forms a specific angle with respect to the radiation incident surface.
Further, the magnitude of the angle formed by the optical axis Ao of the radiation and the radiation incident surface of the imaging device 100B (hereinafter referred to as the imaging device arrangement angle θ _diff ) is determined by the radiation irradiation angle θ calculated by the above method and the incident angle θ calculated here. It is represented by the following formula [10] using the plane inclination angle _θp .
θ _diff =θ−θ _p (10)

The imaging control unit of the medical cart 100A or the control unit of the console 4 has a function of calculating and outputting the difference between the radiation irradiation angle θ and the incidence plane inclination angle _θp (imaging device arrangement angle θ _diff ). As a specific output method, there is a method of displaying on a display unit or transmitting a calculated value to an external display device (not shown).
By displaying the imaging device arrangement angle θ _diff in this way, the user can adjust the radiation irradiation angle θ and the incidence plane inclination angle θ _p while checking the current imaging device arrangement angle θ _diff . The imaging device arrangement angle θ _diff can be easily set to a desired angle.

Here, an example of obtaining one angle from the two atmospheric pressure sensors 67 has been described, but the _third atmospheric pressure sensor 67B is provided at the third portion P3 which is not in a straight line connecting the two atmospheric pressure sensors 67. can be
In this way, the imaging device arrangement angle θ _diff can be obtained three-dimensionally, and the imaging device arrangement angle θ _diff of the imaging device 100B with respect to the optical axis of the radiation can be uniquely obtained.

The radiation imaging system 100 of the present embodiment calculates the imaging apparatus arrangement angle θ _diff between the SID or the radiation incident surface and the optical axis Ao of the radiation as described above, and displays the result on the display unit. ing.
By doing so, the user can easily know the center of gravity of the imaging device 100B and the height of the center.

[Basic flow of shooting]
Next, a basic flow of imaging using the radiation imaging system 100 will be described. FIG. 6 is a ladder chart showing the basic flow of examination using the radiation imaging system 100 of this embodiment.

In the first photographing preparation work, first, the console 4 receives a photographing order from the RIS or the like via the access point 6 or the like (step S1).
Then, the user determines various shooting conditions based on the received shooting order (step S2). Specifically, the user operates the operation unit 31 to select one of a plurality of shooting conditions or to input a numerical value. When performing serial photography, the frame rate, photography time, number of frames, etc. are also determined.

When the imaging conditions are determined, the imaging control unit 2 of the medical vehicle 100A is instructed by the console 4 to set the radiation irradiation conditions of the high voltage generator 33 and the collimator 35 based on the input contents to the operation unit 31. The photographing range, filter type, etc. are set (step S3), and readout conditions (binning range, etc.) of the photographing device 100B are set (step S4).
Note that the setting of various imaging conditions may be automatically performed by the console 4 without being determined by the user.
Also, if the radiation imaging system 100 is provided with a plurality of imaging devices 100B, one of them is selected here.

After the shooting preparations are completed, the user starts the positioning work.
In the positioning work, first, the medical cart 100A is moved to the vicinity of the subject S (step S5). Then, the plug 53a of the power cable 53 is inserted into an outlet so that power can be supplied from the outside (step S6). As described above, since the power supply unit 5 of the medical vehicle 100A is compatible with both a home power supply and a commercial power supply, it can be used not only in operating rooms, intensive care units, hospital rooms, etc., but also in the home of an at-home subject S. can be powered by

Then, the imaging device 100B, the radiation source 34, and the subject S are arranged at positions suitable for the purpose of imaging (step S7). For example, the imaging device 100B is inserted between the inspection target site of the subject S lying on the bed and the bed, or is brought into contact with the side of the subject S, and the radiation source 34 is sandwiched between the subject S. is arranged so as to face the photographing device 100B.
Specifically, the position of the radiation irradiation unit 103 and the orientation of the irradiation port are adjusted while viewing the SID and the imaging apparatus arrangement angle θ _diff displayed on the display unit 41 .
At this time, for example, by providing a light source (not shown) in the case 103a of the radiation irradiation unit 103 and turning on this light source, the same range as the irradiation field to be irradiated with radiation can be illuminated with visible light. keep it In this way, the position of the imaging device 100B can be easily adjusted by aligning the optical axis of visible light with the center of the radiation entrance surface.

After the positioning is done, the user moves on to the shooting work.
In the imaging operation, the user presses the exposure switch 31a (step S8). Then, the photographing control unit 2 adjusts the timings of the high voltage generator 33 and the photographing device 100B and executes photographing. Specifically, when the first step of the exposure switch 31a is pressed, the radiation source 34 is prepared (rotation of the rotor in the case of a rotary anode type), and the imaging apparatus 100B transitions to an imaging ready state.
Here, the user confirms whether or not the radiation irradiation device 3 and the imaging device 100B are ready for imaging. Here, if the medical cart 100A is provided with a status display section for displaying whether or not the radiation irradiation device 3 and the imaging device 100B are in an imaging-ready state, confirmation can be made according to the display contents of the status display section. conduct. With such a configuration, the user can confirm at a glance whether or not shooting is possible. You don't have to, and you can easily check the status.

After confirming that it is ready for imaging, the user presses the second stage of the exposure switch 31a. Then, the radiation control unit 32 controls the high voltage generator 33 to generate radiation continuously for a set period of time or repeatedly in pulses at a set cycle (step S9). The imaging control unit 2 causes the imaging device 100B to repeat reading and accumulation at the set frame rate (generate image data, step S10).
When the preset imaging time elapses, the imaging control unit 2 stops radiation irradiation and reading by the imaging device 100B. Note that even when the exposure switch 31a is released during imaging, radiation exposure and readout of the imaging apparatus 100B are stopped.

After the user finishes imaging, the radiation imaging system 100 enters an operation for image confirmation.
First, the imaging device 100B transfers the generated dynamic image data to the console 4 via the communication unit 21 of the medical vehicle 100A (step S11). Then, the console 4 sequentially performs image processing on the plurality of frame image data constituting the transferred dynamic image data to generate processed dynamic image data (step S12).
Then, the console 4 displays the dynamic image based on the processed dynamic image data on the display section 41 (step S13). It should be noted that an image subjected to simple image processing may be displayed during shooting in order to display the image quickly.
After photographing is completed and image processing is performed on all frame image data, the dynamic image can be confirmed on the display unit 41 .

By checking the dynamic image displayed on the display unit 41, the user determines whether or not re-imaging is necessary (step S14).
After confirming the image, if the user determines that re-imaging is unnecessary (imaging is successful), the image data is stored in the console 4 or transferred to an external device as required.
Thus, a series of photographing ends.

As described above, the radiation imaging system 100 according to the embodiment of the first invention includes the radiation irradiation device 3 having a radiation source that generates radiation, the imaging device 100B that generates image data of a radiation image by receiving radiation, and the radiation source a first height detection means for detecting the height of the imaging device 100B, a second height detection means for detecting the height of the imaging device 100B, and the height and the second height of the radiation source detected by the first height detection means distance calculation means for calculating SID (the distance from the focal point F of the radiation generated by the radiation source to the imaging device 100B) based on the height of the imaging device 100B detected by the detection means; and display means for displaying.

Therefore, while viewing the displayed current SID, the position of the radiation source or the imaging apparatus 100B can be adjusted so that the displayed SID becomes a desired value, so that the SID can be easily adjusted. can be done.

<Second invention first embodiment>
Next, a first embodiment of the second invention will be described with reference to the drawings. In addition, here, the same code|symbol is attached|subjected to the structure similar to 1st invention, and the description is abbreviate|omitted.

[Radiation imaging system]
First, the outline of the radiation imaging system 200 of this embodiment will be described. FIG. 7 is a block diagram of the radiation imaging system 200 of this embodiment.

As shown in FIG. 7, the radiation imaging system 200 according to this embodiment includes the same system main body 100A and imaging device 100B as the radiation imaging system 100 according to the first invention embodiment, or the system main body 100A according to the first invention embodiment. , except for the SID measurement and display functions, and in addition to the photographing device 100B, a body motion detection device 100C is provided.
The body motion detector 100C is communicably connected to the system body 100A. Note that FIG. 7 illustrates a case in which the body motion detecting device 100C is connected by wire, but a wireless connection is also possible.
The body motion detection device 100C can detect the body motion of the subject S during imaging.
The body motion detection device 100C may not be an independent device, but the console 4 may also serve as the body motion detection device 100C.

In the radiation imaging system 200 of this embodiment configured in this manner, radiation (radiation etc.), it is possible to perform at least one of still image photography and serial photography of the subject S.
That is, based on one imaging operation (pressing of the exposure switch 31a), the object S is repeatedly imaged (the imaging device 100B repeats charge accumulation and signal value readout a plurality of times in a short period of time). Dynamic images can be obtained.
That is, the system main body 100A and the photographing device 100B constitute photographing means in the present invention.

[Body motion detector]
Next, a specific configuration of the body motion detection device 100C included in the radiation imaging system 200 will be described. FIG. 8 is a block diagram showing the configuration of the body motion detection device 100C.

As shown in FIG. 8, the body motion detection device 100C includes a control section 71, a communication section 72, a storage section 73, a bus 74 connecting the sections 71 to 73, and the like.
The control unit 71 is composed of a CPU (Central Processing Unit), a RAM (Random Access Memory), and the like. The CPU of the control unit 71 reads various programs stored in the storage unit 73 based on reception of control signals and the like from external devices such as the radiation irradiation apparatus 3 and the console 4, develops them in the RAM, Various processes are executed according to the expanded program, and centralized control is performed on the operation of each unit of the photographing apparatus 100B.

The communication unit 72 receives various control signals from the system main body 100A, receives image data from the photographing device 100B, and transmits various processing results (determination results of body movement, which will be described later) to the system main body 100A. is configured to allow
The storage unit 73 is composed of a nonvolatile semiconductor memory, a hard disk, or the like, and stores various programs executed by the control unit, parameters required for execution of processing by the programs, and the like.
Further, the storage unit 73 can store the image data received from the imaging device 100B.

The control unit 71 of the body motion detection device 100C configured in this manner has the following functions.
For example, the control unit has a function of acquiring a plurality of image data from the imaging device 100B.
In the present embodiment, the first image data (not necessarily the first image) is acquired from the imaging device 100B at the timing when radiation imaging is started, and then images are repeatedly acquired at predetermined time intervals. All the image data may be acquired each time the imaging device 100B generates the image data, or the image data may be acquired every predetermined number of images.
The acquired image data is stored in the storage unit.
The control unit 71 having such functions constitutes an acquisition means in the present invention.

In addition, the control unit 71 has a function of designating the specific parts P ₄ to P ₇ that are required not to cause body movements different from the specific body movements to be diagnosed for each acquired image data. there is
"Specific body movements to be diagnosed" include heartbeats, expansion and contraction of the lungs, vertical movement of the diaphragm, movement of surrounding bones associated with these movements, blood flow, and the like.
On the other hand, the “body motion different from the specific body motion” is the displacement, rotation, or the like of the entire body part to be imaged.
Therefore, the "specific parts P ₄ and P ₅ " include, for example, shoulders and flanks as shown in FIG. Moreover, in this embodiment, since radiographic images are used, the spine and clavicle can be set as the specific parts _P6 and _P7 by extracting the bones.
The control section 71 having such a function constitutes the part specifying means in the present invention.

Further, the control section 71 has a function of detecting the motion of the specific parts P ₄ to P ₇ specified by the part specifying means based on a plurality of image data.
Specifically, common specific parts in two or more image data out of a plurality of acquired image data are compared with each other, and the amount of displacement of the specific part (or a small area or point within the specific part) is calculated. Measured as an amount of movement.
It is also possible to detect the amount of movement of the specific parts P ₄ to P ₇ by dividing them into a first direction component, which is the direction in which the specific body movement is performed, and a second direction component, which is different from the first direction. is.
In addition, when the specific parts P ₄ to P ₇ are the parts whose movement is difficult to detect, an indicator (marker M) is attached to the area of the body surface of the subject S that overlaps the specific part. It is also possible to detect the motion based on the amount of displacement of the index object.
The control section having such functions constitutes the motion detection means in the present invention.

The control unit 71 also has a function of determining whether or not there is a body motion different from a specific body motion based on the detected motion.
Specifically, when the amount of motion of a specific part, which is the magnitude of the detected motion, exceeds a predetermined threshold, it is determined that there is body motion different from the specific body motion, and when the amount of motion is equal to or less than the threshold, It is determined that there was no body movement (body movement is to the extent that it does not affect imaging).
Note that when detecting the motion amount of a specific part by dividing it into a first direction component and a second direction component, the first threshold for comparison with the motion amount in the first direction and the motion amount in the second direction and a second threshold for comparison with can be set respectively.
The control unit 71 having such functions constitutes body movement determining means in the present invention.

For example, when performing serial radiography of the lung field, specific body movements associated with respiration occur in the shoulders in the vertical direction to some extent, but body movements in the horizontal direction do not normally occur. Therefore, when the shoulder is specified as a specific part and serial radiography of the lung field is performed, if lateral body movement is detected in the shoulder, it can be determined that the subject S has lost balance during radiography. .
In addition, when the body movement in the vertical direction is too large in the shoulder, it can be determined that the body movement in the vertical direction different from the specific body movement is occurring in the shoulder.
In addition, since the spine normally does not move in any direction during serial imaging, if the spine is designated as a specific site and serial imaging is performed, body motion in any direction will be detected in a specific body. It can be determined that the body motion is different from the motion.

Note that the control unit 71 may have a function of warning the user that body movement that affects diagnosis has occurred when it is determined that there is body movement.
Specifically, the warning is given by displaying a message to that effect on the display unit, emitting sound from a speaker, or lighting a lamp.
By doing so, the control section will control the warning means in the present invention.

Further, the control unit 71 may have a function of interrupting radiation irradiation from the radiation source when it is determined that there is body movement.
Specifically, when it is determined that there is body movement, a predetermined control signal is transmitted to the console 4 or the imaging control unit, and when the console 4 or the imaging control unit receives this control signal, radiation is emitted. A signal instructing to stop irradiation is transmitted to the radiation control unit.
By doing so, the control section serves as the photographing interrupting means of the present invention.
Either one of the warning function and the radiation irradiation interrupting function may be provided, or both of them may be provided.

[Basic flow of shooting]
The flow of imaging using the radiation imaging system 200 according to this embodiment is also basically the same as that using the radiation imaging system 100 according to the first embodiment of the invention (see FIG. 6).
In the placement of the imaging device 100B and the radiation source 34 (step S7), the placement of the imaging device 100B and the radiation source 34 is arranged using the display function of the SID and the imaging device placement angle θ _diff described in the first embodiment of the invention. It can be carried out.
When the user presses the second stage of the exposure switch 31a to repeat irradiation of radiation (step S10) and generation of image data (step S11), image data is acquired by the body motion detector 100C, and body motion is detected. Continue to judge whether or not
When the preset imaging time elapses without the body movement detecting device 100C determining that there is body movement, imaging ends.
On the other hand, if the body motion detection device 100C determines that there is a body motion during shooting, the shooting is interrupted immediately after that.

<Second invention second embodiment>
Next, a second embodiment of the second invention will be described with reference to the drawings. In addition, here, the same code|symbol is attached|subjected to the structure similar to 1st invention, and the description is abbreviate|omitted.

[Radiation imaging system]
First, the outline of the radiation imaging system 300 of this embodiment will be described. FIG. 10 is a block diagram of the radiation imaging system 300 of this embodiment.

The radiation imaging system 300 according to the first embodiment detects body movement based on the image data generated by the imaging device 100B. Body motion is detected based on the generated image data.
Therefore, the radiation imaging system 300 according to this embodiment includes an optical camera 43 in addition to the configuration described in the first embodiment.
As in the first embodiment, the body motion detection device 100C may not be an independent device, but the console 4 may also serve as the body motion detection device 100C.

The optical camera 43 is communicably connected to the apparatus main body (console 4) by wire or wirelessly. Then, the image data of the photographed image (either a still image or a dynamic image) is transmitted to the main body of the apparatus.
The optical camera 43 also repeatedly photographs the subject S during radiation imaging (including serial imaging).
In other words, the optical camera 43 also serves as a photographing means in the present invention.
The position of the optical camera 43 is not particularly limited as long as the position of the subject S being radiographed can be photographed. For example, as shown in FIG. preferably.

Also, the control unit of the body motion detection device 100</b>C according to this embodiment has a function of acquiring a plurality of image data from the optical camera 43 .
The acquired image data may be stored in the storage unit, or may be discarded without being stored after being used for body motion detection.

Since the optical camera 43 cannot image a specific part (spine or bone) in the body, in the serial imaging using the radiation imaging system 300 according to the present embodiment, the index is placed on the body surface of the subject S. It is preferable to attach an object and detect the motion based on the motion (displacement amount, displacement direction) of the index object attached to the subject S. FIG.
The identification of the index object may be performed automatically by the body motion detection device 100C by identifying the color of the index object, or by displaying the image acquired from the optical camera 43 on the display unit and displaying the displayed image. This may be done based on the user's designation of the area when viewing the image.
In addition, as long as the body movement detection device 100C can identify the indicator in the image data, the material, shape, and size of the indicator are free. For example, if the indicator is made of a material with high radiation transmittance, it is possible to prevent the indicator from appearing in the radiographic image while judging the presence or absence of body movement.

As described above, the body motion detection device 100C of the radiation imaging systems 200 and 300 according to the first and second embodiments of the second invention repeatedly generates image data of the subject S based on one imaging operation. an acquisition means for acquiring a plurality of image data from an imaging means capable of obtaining a specific body part that is required not to cause body movement different from the specific body movement to be diagnosed for each image data acquired by the acquisition means a motion detecting means for detecting the motion of the specific part specified by the part specifying means based on a plurality of image data; and a specific body motion based on the motion detected by the movement amount calculating means. is equipped with a body motion determining means for determining the presence or absence of different body motions.

For this reason, body movement is not determined for parts other than specific parts (parts that do not affect imaging even if body movement occurs), and only when body movement different from specific body movement occurs in specific parts It can be determined that there is movement.

Next, a description will be given of problems that may newly arise in carrying out the embodiments of the first and second inventions and specific examples for solving the problems.
It should be noted that the techniques described in the following examples may be used in radiation imaging systems to which the first and second inventions are not applied.

[Measurement method (1)]
As described above, the conventional radiation imaging system has the problem that it is difficult to grasp the SID and adjust it to a predetermined SID, because the SID changes depending on the imaging technique, the imaging situation, and the condition of the subject S. rice field.
In view of such problems, the first invention solves the above problems by calculating the SID based on the length and angle of each part of the system and displaying it. Alternatively, a stereo camera 44 capable of measuring the distance between itself and the subject S may be provided at a site where the radiation irradiation unit 103, the relative position of the radiation irradiation unit 103 does not change, or where the relative position can be detected. good. As a specific mounting location of the stereo camera 44, it is preferable to use the radiation irradiation unit 103 as shown in FIG.

Since the distance between the focal point F of the radiation and the stereo camera 44 is determined at the time of designing and manufacturing the system main body 100A, this distance is added or subtracted from the distance measured by the stereo camera 44, and the estimated subject SID can be calculated by summing the body pressure of S.
If the SID calculated in this way is displayed on the display unit, while looking at the current SID displayed, the radiation source or the imaging device can be adjusted so that the displayed SID becomes a desired value, as in the first invention. Since the position of the device 100B can be adjusted, the SID can be easily adjusted.

[Measurement method (2)]
In view of the problem that it was difficult to grasp the SID and adjust it to a predetermined SID in the conventional radiation imaging system, for example, as shown in FIG. A transmission means 103d provided at a portion where the relative position with respect to the portion 103 does not change or a portion where the relative position can be detected, and simultaneously transmits a first signal traveling at a predetermined speed and a second signal having a different speed from the first signal; A receiving means 7 provided in the photographing apparatus 100B for receiving the first and second signals respectively is provided, and a difference between the time when the receiving means 7 receives the first signal and the time when the second signal is received is displayed on the console 4 or the like. A function as a calculation means for calculating the distance between the radiation irradiation unit 103 and the imaging apparatus 100B based on Td (see FIG. 13) may be provided.
For the first and second signals, signals having different velocities such as sound waves and radio waves can be used.
By doing so, the current SID can be grasped, and the photographing can be performed with an appropriate SID.

[Measurement method (3)]
Further, in view of the problem that it was difficult to grasp the SID and adjust it to a predetermined SID in the conventional radiation imaging system, for example, as shown in FIG. A first transmitting means 103d for transmitting a specific signal and a first receiving means 103e for receiving the specific signal, which are provided at a site where the relative position with respect to the unit 103 does not change or at a site where the relative position can be detected; A second receiving means 7 for receiving the specific signal and a second transmitting means 7A for transmitting the specific signal immediately after the second receiving means 7 receives the specific signal from the first transmitting means 103d or after a specific time has passed. and the difference between the time when the first transmitting means 103d transmits the specific signal and the time when the first receiving means 103e receives the specific signal from the second transmitting means 7A. and calculating means for calculating the distance of .
A sound wave, an electric wave, or the like, for example, can be used as the specific signal.
By doing so, the current SID can be grasped, and the photographing can be performed with an appropriate SID.

It should be noted that the plurality of receiving means 7 in the description of the measurement method (2) above may be arranged at three or more different receiving points in the photographing device 100B. In this way, it is also possible to calculate the imaging device arrangement angle θ _diff of the imaging device 100B.
In this case, radio waves or sound waves of different frequencies may be transmitted from the transmitting means 103d to the respective receiving means 7. FIG. By doing so, interference of radio waves or sound waves can be prevented, and calculation of SID and the like can be performed more reliably.
In this case, a plurality of transmitting means 103d corresponding to each receiving means 7 may be arranged at a plurality of different locations in the radiation irradiation section 103, as shown in FIG. 15, for example. In this way, interference can be prevented more reliably.
Alternatively, the transmitting means 103d may be combined into one and arranged at one place. By doing so, the number of parts can be reduced, and the configuration including the imaging control unit 2 and the radiation control unit 32 can be simplified.

Further, instead of transmitting the first and second signals from the radiation irradiation unit 103 side to the imaging apparatus 100B, a transmission unit is provided in the imaging apparatus 100B and a reception unit is provided in the radiation irradiation unit 103 side so that the signals from the imaging apparatus 100B The first and second signals may be transmitted toward the radiation irradiation unit 103 side. In the case of the configuration of this embodiment, the number of processes on the receiving means side increases, so the control unit tends to be heavy or large, and there is a possibility that the photographing apparatus 100B will be difficult to carry. By doing so, it is possible to prevent the photographing device 100B from becoming heavy or becoming large.
Further, an air pressure sensor 67 and a temperature sensor 68 may be provided, and the time at which the signal is received by the receiving means or the calculated distance may be corrected based on the values measured by these sensors. In this way, more accurate distances and angles can be calculated.
Also, as the sound wave, a sound wave having a frequency outside the audible range may be used. In this way, when the imaging device 100B is arranged, the user and the subject S do not feel uncomfortable due to the sound.

[Measurement method (4)]
Further, in view of the problem that it was difficult to grasp the SID and adjust it to a predetermined SID in the conventional radiation imaging system, for example, as shown in FIG. a grid (radiation A selective transmission section (G) may be provided on the radiation focal point (F) side of the imaging apparatus 100B, and the SID and the like may be calculated based on the radiographic image captured through this grid (G).

As shown in FIG. 16A, when the focal point F of the radiation and the imaging device 100B are separated by a predetermined distance, and the thin plates Ga constituting the grid G are all parallel to the radiation, the thin plates Ga block the radiation. Since the radiographic image Ir captured by the imaging device 100B is entirely black because the radiographic image Ir is captured by the imaging device 100B.
On the other hand, as shown in FIG. 16(b), when the focus F of the radiation approaches the imaging device 100B, there is not much difference in the angle between the radiation and the thin plate Ga at a location near the center of the radiation incidence surface, and the radiation is projected onto the thin plate Ga. Since the light reaches the imaging device 100B without being blocked by Ga, the central portion of the radiation image Ir becomes black. However, the relative angle between the radiation and the thin plate Ga near the periphery of the radiation incident surface is large near the end of the imaging device 100B, and the radiation is blocked by the thin plate Ga, resulting in the imaging device 100B. , the periphery of the radiographic image Ir becomes whiter than the central portion. The degree to which the radiation image Ir becomes white changes depending on how much the distance between the focus F of the radiation and the imaging device 100B has changed from the predetermined distance.
By using this principle, it is possible to calculate the current SID based on the dose of radiation that can be measured from the densities of the central portion and peripheral portion of the radiographic image Ir.

In addition, as shown in FIG. 17, when the radiation incident surface of the imaging device 100B is tilted, the radiation is totally blocked by the thin plate Ga and becomes difficult to reach the imaging device 100B. Become. The degree to which the radiation image Ir becomes white changes according to the degree of inclination of the radiation incident surface with respect to the optical axis Ao of the radiation.
By using this principle, the current imaging apparatus arrangement angle θ _diff can be calculated from the overall density of the radiographic image Ir.

The grid G is located at a position facing the periphery of the radiation incident surface _61e as shown in FIG. It is desirable to arrange it with the width as narrow as possible.
18(a), the grid G may be in the shape of a rectangular frame so as to face the four sides of the radiation entrance plane, or as shown in FIG. 19(a). It is good also as L shape which opposes.

Since the image of the subject S is also superimposed on the image of the grid G, the current SID and the imaging apparatus arrangement angle θ _diff may be detected by performing imaging without the subject S present.
_In addition, since the image of the subject S is also superimposed on the image of the grid G, as shown in _FIG . The current SID and the imaging device arrangement angle θ _diff may be detected based _on the processed signal value V2.

Further, an actuator 8 or the like that can move the grid G may be provided, and as shown in FIG. 21, the grid G may be retracted to a region that does not face the radiation incident surface 61e during imaging.
Alternatively, a diagnostic image may be captured while the grid G is arranged, and the current SID and the imaging apparatus arrangement angle θ _diff may be obtained from the diagnostic image.
Further, before capturing the diagnostic image, the current SID and the imaging device arrangement angle θ _diff are calculated from the density of the image obtained by irradiating the grid G with radiation weaker than that when the diagnostic image is captured, and Based on this value, the SID and the imaging device arrangement angle θ _diff may be adjusted.

[Measurement method (5)]
Further, in the conventional radiation imaging system, in view of the problem that it was difficult to grasp the SID and adjust it to a predetermined SID, for example, as shown in FIG. 103 relative to the optical camera 43, which is fixed or provided at a detectable site, and acquires an optical image in the irradiation direction of the radiation, and the size of the subject S or the imaging device 100B shown in the optical image Io. and calculating means for calculating the SID of the.
In this case, the size of the subject S or the imaging apparatus 100B is previously input to the console 4 or the like, and the imaging magnification of the optical camera 43 is unchanged.

By doing so, the current SID can be grasped, and the photographing can be performed with an appropriate SID.
In addition, unlike the measurement method (4) above, there is no need to irradiate radiation for determining the SID before imaging, so the exposure dose of the subject S can be reduced.

If a monocular camera is used as the optical image acquisition means, only one camera can be used, and image processing can be performed more easily than with a compound eye camera.
Also, if a monocular camera is used, calibration can be completed easily.
Further, the photographing magnification of the optical image acquiring means may be variable by grasping in advance the relationship between the photographing magnification and the photographing range.
Further, a correction means for correcting distortion of the photographing range of the optical image acquisition means may be provided.

[Calibration method]
In the calibration method in the above-described embodiment, it is necessary to place the photographing device 100B in advance at a specific position whose height is known. There is a problem that an error occurs due to changes in atmospheric pressure, etc.
In addition, if the camera is moved to a location with a different height (for example, different floors in a building several times) to shoot after the calibration, the height at which the camera 100B is installed will change. There is a risk that an SID different from the actual one will be displayed if calibration is not performed.
Also, when the imaging apparatus 100B is fixed and operated, the atmospheric pressure fluctuates greatly due to the passage of high/low pressures, so there is a risk that an SID different from the actual one will be displayed unless detailed calibration is repeated. there were.

In view of such a problem, a second atmospheric pressure sensor 67A that measures the atmospheric pressure at the height at which the medical vehicle 100A is located is provided at the above-mentioned specific part of the medical care vehicle 100A, and based on the measured value measured by the second atmospheric pressure sensor 67A , the detected height of the photographing device 100B may be corrected.
In this way, the height of the imaging device 100B is determined by the measured values of the atmospheric pressure sensor 67 and the temperature sensor inside the imaging device 100B and the measured values of the second atmospheric pressure sensor 67A (however, the temperature around the medical vehicle 100A is determined by the imaging device 100B is assumed to be the same as the ambient temperature), the height can be calculated as a relative height with reference to a specific portion of the medical cart 100A.
That is, the second atmospheric pressure sensor 67A arranged on the medical care vehicle 100A can always be used to cancel atmospheric pressure fluctuations, so there is no need to perform a calibration operation.

[Calibration switch]
In the height measurement of the imaging device 100B using the atmospheric pressure sensor 67 in the above-described first invention embodiment, the pressure change around the imaging device 100B or the radiation imaging system 100 and the height change accompanying the movement of the floor etc. Calibration should be done at the right time. However, if calibration is performed at a timing unintended by the user, the display of the SID or the like may change at a timing unintended by the user, causing a problem.

In view of such a problem, the photographing apparatus 100B is provided with a calibration start button 61f that can be operated by the user as shown in FIG. can be
By doing so, the calibration can be performed at the timing intended by the user, and the problem that the display of the SID or the like changes at the timing unintended by the user can be reliably avoided.

Note that the calibration start button is shared with the other switches 61a and 61b, and the calibration is started when the button is operated in an unusual manner (for example, long press or double click). can be
Also, the button may be provided on the system main body 100A side (for example, the display unit 41 or the like) instead of providing it on the imaging device 100B.
Further, when the calibration is started, the fact may be notified to the user by display, voice, or the like.
Furthermore, an OK button may be provided separately from the button for starting calibration, and even if the button for starting calibration is operated, calibration may not be started until the OK button is operated (an erroneous operation prevention lock function may be used). may be held).

[Barometric pressure sensor placement position]
The imaging device 100B has an airtight structure to prevent liquids (such as blood) from entering. Therefore, in the above-described first embodiment of the invention, if the atmospheric pressure sensor 67 is to be incorporated in the photographing device 100B, the atmospheric pressure sensor 67 will be arranged in the inner space Sp1 of the airtight structure of the photographing device 100B, and the outside of the photographing device 100B. barometric pressure cannot be measured accurately.
In view of this problem, for example, as shown in FIG. 24, an intermediate space Sp2 that does not have an airtight structure is provided in the imaging device 100B, and the atmospheric pressure sensor 67 is positioned inside the imaging device 100B and inside the airtight structure. You may make it arrange|position outside space Sp1.
In this way, even when the atmospheric pressure sensor 67 is incorporated in the imaging device 100B, the atmospheric pressure around the imaging device 100B can be accurately measured.

[Atmospheric pressure sensor arrangement structure]
As described above, when the atmospheric pressure sensor 67 is arranged outside the airtight structure, the atmospheric pressure sensor 67 may be exposed to liquid (such as blood), making the atmospheric pressure sensor 67 unusable and making it impossible to calculate the SID or the like. be.
In view of such problems, the communication path 61g that communicates the intermediate space Sp2 and the outer space of the photographing device 100B may be formed thin, and the parts constituting the communication path 61g may be detachable.
Specifically, as shown in FIG. 25, an intermediate space Sp2 (outside the inner space Sp1, which is an airtight structure) provided with the air pressure sensor 67 in the housing 61 of the imaging device 100B and the outer space of the housing 61 A detachment portion 61h having a communication passage 61g for communicating with is provided.

As a specific method of making the detachable portion 61h detachable from the housing, for example, one of the housing and the detaching portion 61h is formed with a recess and the other is formed with a protrusion that fits into the recess. It can be a fit method.
Also, the width of at least a portion of the communication path 61g on the housing side, the removal portion 61h side, or both is narrowed.

In this way, even if the imaging device 100B is splashed with liquid, the liquid is stopped by the narrow communication passage 61g, so it is possible to prevent the liquid from reaching the atmospheric pressure sensor 67 and making the atmospheric pressure sensor 67 unusable. can.
Further, even if the communicating passage 61g is clogged with liquid and cannot be removed, the air pressure can be measured again by replacing the removable portion 61h.

The end portion of the communication passage 61g in the detached portion 61h may be formed as an air intake portion wider than the intermediate portion.
In addition, the width of one of the housing-side end of the communicating passage 61g in the detaching portion 61h and the opening of the intermediate space Sp2 provided with the atmospheric pressure sensor 67 in the housing is widened to form a connecting portion, and the connecting portion of the detaching portion 61h is formed. The passage 61g and the opening of the housing may be easily connected.
Alternatively, at least a portion of the communication path 61g on the housing side, the detachment portion 61h side, or both may be provided with a folding portion for making it difficult for the liquid to flow, or a liquid pool portion with an intentionally widened width. good.
At least part of the communication path 61g may be made of a hydrophobic material, or conversely, a part of it may be made of a hydrophilic material.
Also, an absorber that absorbs liquid may be arranged on at least a part of the wall surface forming the communicating passage 61g.
In addition, when an abnormality is detected in the measured value of the atmospheric pressure sensor 67, such as no change in the measured value of the atmospheric pressure sensor 67 for a certain period of time, notification to the effect that an abnormality has been detected or notification to prompt replacement of the detachable portion 61h. may be performed.

[Placement of barometric pressure sensor on the holder]
In addition, if the atmospheric pressure sensor 67 is built into the photographing device 100B, the atmospheric pressure sensor 67 will be arranged inside the airtight structure of the photographing device 100B, and the atmospheric pressure outside the photographing device 100B cannot be measured accurately. In view of this problem, for example, as shown in FIG. 26, the air pressure sensor 67 may be arranged in the holder H that includes the photographing device 100B.
In this way, the holder H does not need to have an airtight structure, so the air pressure can be accurately measured, and the height can be accurately calculated from the measured air pressure.

A battery, a control unit for calculating the height from the measured value, and a communication unit for transmitting the calculated height to the outside may be provided in the holder H. In this way, the air pressure can be measured with the holder H alone.
At that time, the air pressure measured by the air pressure sensor 67 inside the holder H or the height calculated by the controller inside the holder H may be sent directly to the system main body 100A, or via the imaging device 100B. You may make it transmit to the system main body 100A. In this way, the height information can be transmitted simply by performing short-distance data communication between the holder H and the photographing device 100B, so the energy required for communication can be reduced.

Also, the power used by the holder H may be configured to be supplied from the imaging device 100B. In this case, a connector may be provided at a portion of the holder H where the connector of the photographing device 100B is fitted so that the power supply may be received by wire through the connectors of both, or the power may be supplied wirelessly using an electromagnetic action or the like. You can also receive it.
Also, as shown in FIG. 26(b), the holder H may be provided with a grid G. FIG.

[Use of sensors]
In serial imaging, the subject S may move and deviate from the desired imaging state after the user positions the subject S and before imaging is started, or during imaging.
In addition, when it is difficult to distinguish whether the movement of the subject S is a specific body movement to be diagnosed or a body movement other than the specific body movement not to be diagnosed, using only the captured image. There is

In view of such problems, for example, as shown in FIG. , and whether or not the measured value sent from the sensor Se1 is caused by a body movement other than a specific body movement that is not subject to diagnosis, by means of judgment such as an arithmetic expression according to the imaging technique; Alternatively, determination may be made as to whether body motions other than specific body motions are of a level that makes it difficult to use them as diagnostic images.
As a specific attachment method, for example, sticking with a sticky substance or the like can be mentioned.
Further, the sensor Se1 to be attached includes, for example, an acceleration sensor, an angle sensor, a gyro sensor, a geomagnetic sensor, and the like.
In addition, when the console 4 determines that there is a level of body movement that is difficult to use as a diagnostic image, the console 4 notifies the user or stops radiation irradiation to stop imaging.

In this way, the level of body motion other than the specific body motion can be grasped from the measured value by the sensor Se1. If the level is not usable for diagnosis, the risk of exposing the subject S to unnecessary exposure can be reduced by notifying the user or canceling the imaging.
The motion information detected by the sensor Se1 may be directly transmitted to the system main body 100A, or may be transmitted to the system main body 100A via the imaging device 100B.

[Using Markers]
By performing imaging with the marker M attached to the subject S, it is possible to know the state of the subject S from the captured image of the marker M. FIG. The marker M used at that time has a relatively simple shape such as a cylindrical shape, but such a marker M has the same shape whether the subject S is tilted to the right or to the left. Therefore, the direction of the imaging device arrangement angle θ _diff could not be detected. As a result, there is a problem that it is not possible to properly instruct the subject S in which direction to incline.

In view of such problems, a marker M having a hole Ma penetrating in a direction inclined with respect to the attachment surface to the subject S may be used.
More specifically, for example, as shown in FIG. 28, a device is used in which holes Ma are provided at four locations, upper, lower, left, and right, which penetrate toward the mounting surface when viewed from the radiation irradiation direction. Each hole Ma is inclined away from the center of the marker M toward the mounting surface. Note that FIG. 28 shows only a cross-sectional view of the marker M in the left-right direction, but the cross-sectional view in the up-down direction is the same.

When the marker M is irradiated with radiation, the radiation is attenuated when it passes through parts other than the hole Ma, so the dose of radiation reaching the subject S and the imaging apparatus 100B is reduced. On the other hand, since the radiation is not attenuated in the hole Ma, the dose of the radiation reaching the subject S and the imaging apparatus 100B is higher than the radiation that has passed through parts other than the hole Ma.
Generally, in a radiographic image, portions with strong attenuation of radiation are displayed in white, and portions with weak attenuation are displayed in black.

Here, when the marker M is arranged so that the mounting surface and the optical axis Ao of the radiation are perpendicular to each other, the holes Ma formed in the left and right sides of the marker M are inclined in opposite directions, but the direction of inclination is opposite. Since the angles of inclination with respect to the optical axis Ao are the same, the widths of the holes Ma (slits) on the left and right sides of the marker M viewed from the side of the focal point F of the radiation appear to be the same as shown in FIG. 28(a).
On the other hand, when the marker M is arranged so that the mounting surface is inclined by θ with respect to the optical axis Ao of the radiation, the angles of inclination of the holes Ma on the left and right sides of the marker M with respect to the optical axis Ao are different between the left and right. The widths of the holes Ma (slits) on the left and right sides of the marker M when viewed from the focal point F side of , appear different on the left and right as shown in FIG. 28(b). Specifically, the hole Ma in the direction in which the marker M is tilted appears large. The width of the hole Ma varies in proportion to the angle θm at which the mounting surface of the marker _M is inclined with respect to the optical axis Ao.

By using this principle, it is possible to calculate in which direction and how much the marker M is tilted.
Therefore, by doing so, the tilt direction of the subject S with the marker M can be estimated from the tilt direction of the marker M, and the direction of the subject S can be adjusted to a direction suitable for imaging. can.

It is desirable that the marker M be made of a material having a large radiation attenuation coefficient (for example, metal, magnet, etc.) so that the edge portion of the hole Ma can be clearly identified.
However, in some cases, it is desirable to use a material with a small radiation attenuation coefficient (for example, resin, wood, etc.) for the material of the marker M. This is to make it easier to take an image of the marker portion when the image behind the marker is also desired to be used as a diagnostic image.
By recognizing the marker portion of the image through image processing and performing image correction such as changing the contrast of the marker portion, processing to make the marker less visible on the image may be further performed.
Further, the calculation of the tilt direction and the tilt angle based on the captured image of the marker M may be performed by the system main body 100A side, or may be performed by the image processing section of the imaging device 100B.

[Subject movement detection]
In addition, in serial imaging, there is a problem that the subject S may move and deviate from the desired imaging state during the period from when the user positions the subject S to when the imaging is started, or during imaging. In view of this, for example, as shown in FIG. 29, the radiation irradiation unit 103 is provided at a site where the relative position with the radiation irradiation unit 103 does not change, or at a site where the relative position can be detected, and the radiation direction (subject S) is provided. , an actuator 103b provided in the arm 102, a connecting portion between the arm 102 and the radiation irradiation unit 103, or the like, for controlling the irradiation direction of the radiation, and the console 4 and the imaging control unit 2, the optical image Io of the subject S photographed by the optical camera 43 is image-processed to detect the movement of the subject S; may be provided with a function as control means for controlling the .

In this way, even if the subject S moves, a desired imaging state can be maintained by detecting the movement of the subject S and controlling the position of the radiation irradiation unit 103 according to the movement. .
It should be noted that the correction direction and correction amount of the position of the radiation irradiator 103 are notified to the user based on the detection results of the detection means (to assist the user's adjustment) without having the function of the actuator 103b or the control means. may
Further, as the motion of the subject S, not only the direction but also the angle may be detected.
If it is difficult to detect the movement of the subject S by image processing, a marker M is attached to the subject S, the movement of the marker M is detected by image processing, and the movement of the subject S is estimated. You may make it

[Use of camera]
In imaging the subject S in the standing position or imaging in an imaging room, the positions of the radiation irradiation unit and the imaging device can be adjusted relatively easily.
However, imaging using the mobile inspection vehicle 100A is often performed on a subject S who is difficult to stand up or move, in a recumbent position (for example, lying on his/her back on a bed, obliquely to the upper surface of the bed). direction)). In this case, it is necessary to place the radiation irradiation unit 103 at a high position and irradiate the radiation downward. becomes difficult.
In particular, it becomes more difficult for a short user (for example, a female engineer) to take an image.

In view of such problems, for example, as shown in FIG. An optical camera 43 capable of photographing and a display unit 41 for displaying an image photographed by the optical camera 43 may be provided.
In this way, the user can adjust the positions of the imaging device 100B, the subject S, and the radiation irradiation unit 103 from the viewpoint from the radiation irradiation unit 103 displayed on the display unit 41, thereby improving workability. be able to.
In addition, it is possible to reduce the risk of capturing a radiographic image that cannot be used for diagnosis due to inadequate positional adjustment of the imaging device 100B, subject S, and radiation irradiation unit 103 .

[Use of pressure sensor (1)]
When imaging the subject S in the supine position, the imaging device 100B is arranged between the bed and the subject S. As shown in FIG. Therefore, it is difficult to visually recognize the imaging device 100B from the radiation irradiation unit 103 side, and it is difficult to grasp the relative position between the subject S and the imaging device 100B. Therefore, it is difficult to position the subject S at a desired position.
In view of such problems, for example, as shown in FIG. 31, a pressure sensor Se2 that measures the pressure acting on the imaging device 100B and a display unit 41 that displays the measurement result of the pressure sensor Se2 are provided. good too.
As the pressure sensor Se2, for example, as shown in FIG. 32, a planar sensor that can measure the in-plane pressure distribution and is arranged parallel to the radiation incident surface 61e, or a pressure sensor that can measure the pressure at one point and can measure the radiation incident surface 61e. For example, a plurality of them are arranged in an array along a surface.

The radiation entrance surface 61e of the imaging device 100B is divided into a plurality of areas (upper and lower, left and right, or both), and a pressure sensor Se2 is arranged in each area to detect whether or not pressure is applied to each area. You may do so.
Also, the pressure sensor Se2 may be arranged so as to detect the pressure of a specific site.
Further, the pressure sensor Se2 may be provided on the side of the radiation incident surface 61e of the imaging device 100B as shown in FIG. 33, or may be provided on the side away from the radiation incident surface 61e of the imaging device 100B. .

When the pressure sensor Se2 is provided on the side of the radiation incident surface 61e of the imaging device 100B, the pressure sensor Se2 can be arranged on the side of the imaging device 100B that the subject S directly touches. , can be measured faster and more sensitively. Also, this makes it possible to grasp the position of the subject S more quickly and accurately.
Further, when the pressure sensor Se2 is provided on the side of the radiation entrance surface 61e of the image capturing apparatus 100B, the radiation detection unit 63 accumulates electric charges according to the radiation transmitted through the pressure sensor Se2. Depending on the structure, the pressure sensor Se2 may be reflected in the radiation image Ir. However, the radiographic image in which the pressure sensor Se2 is reflected is also reflected in the radiographic image when the subject S is not present. is acquired in advance, and image processing such as subtracting the image of the pressure sensor Se2 from the radiographic image of the subject S is performed to easily remove the reflection of the pressure sensor Se2.
On the other hand, when the pressure sensor Se2 is provided on a surface away from the radiation incident surface 61e of the imaging device 100B, the imaging device 100B can acquire an image that does not pass through the pressure sensor Se2. There is no need to remove reflections.

In this way, for example, the distribution 41a of the measured values by the pressure sensor Se2 represented by an ellipse as shown in the lower part of FIG. can be displayed on the display unit 41 . From such information, it is possible to detect which part of the imaging device 100B the subject S is applying pressure to.
In addition, it is possible to estimate the position of the subject S with respect to the imaging device 100B from the information on which part the subject S is applying pressure to, thereby positioning the subject S at a desired position. can do.

It should be noted that, up to this point, an imaging procedure has been described in which it is preferable to place the subject S so that the body axis of the subject S passes through the center point of the radiation entrance plane 61e. It can also be applied to imaging techniques other than the case.
For example, in an imaging procedure in which it is desirable to position the subject S so that the body axis of the subject S passes through a reference point shifted laterally from the center of the radiation entrance plane 61e by a predetermined distance (for example, two-thirds to the right). 31(b), it is sufficient to determine whether or not the reference point is positioned between two ellipses representing the distribution of measured values.

In addition, the radiation imaging system has a function as monitoring means for monitoring the value of the pressure sensor Se2 even during imaging, and when the monitoring means detects a change in the value of the pressure sensor Se2, the imaging apparatus 100B is detected by sound, light, display, or the like. Stops radiation irradiation when the monitoring means detects a change in the value of the pressure sensor Se2 or functions as a notification means for notifying the user that there is a possibility that the positional relationship between the and the subject S has changed, and a function as a photography stop means for stopping photography.
In this way, when the imaging device 100B or the subject S moves (for example, the imaging device 100B slides down) when serial imaging is performed, the positional relationship between the imaging device 100B and the subject S changes, resulting in a desired image. It is possible to detect that there is a possibility that shooting has not been performed.

[Use of length measurement means]
When preparing for imaging, when performing still image imaging, or when performing serial imaging, it is necessary to position the subject S at a desired position of the imaging apparatus 100B.
In view of such problems, for example, as shown in FIG. 34, the length measuring means 9 may be provided at the end of the imaging device 100B.
In this way, it is possible to grasp whether or not the subject S is positioned at a desired position with respect to the imaging apparatus 100B, and to perform imaging while the subject S is appropriately positioned. can.

The length measuring means 9 may be provided on one side of the imaging device 100B to detect the position of the subject S from the distance from one side, or may be provided on both sides of the imaging device 100B to detect the subject from the distance from both sides. Although the position of the subject S may be detected, the position of the subject S can be detected more accurately by providing similar length measuring means 9 on both sides of the imaging apparatus 100B. It is useful when it is preferred to be positioned in the center of device 100B.
The length measuring means 9 may be, for example, a measure that can be pulled out from the housing, or may be a non-contact type using a laser. If the length measuring means 9 does not directly require a hand, the length measurement can be continued even during the serial imaging, and it can be confirmed whether or not the subject S has moved from a suitable imaging state during the serial imaging.
Further, when it is determined that the object S is moving as a result of the length measurement, it is possible to warn the user or stop the radiation irradiation and stop the imaging.

[Use of proximity sensor]
Further, in consideration of the problem that it is necessary to position the subject S at a desired position of the imaging device 100B when preparing for imaging, when performing still image imaging, or when performing serial imaging, In addition to providing a proximity object detection sensor or a contact detection sensor, the radiation imaging system is provided with a function as a judgment means for judging the presence or absence of an object approaching the proximity object detection center or the presence or absence of an object contacting the contact detection sensor. can be
As the proximity object detection sensor, for example, a capacitive sensor or the like can be used.
In addition, as a contact detection sensor, a resistive film method, an acoustic pulse recognition method, an ultrasonic surface acoustic wave method, an infrared light shielding method, a capacitance method, a surface capacitance method, a projective capacitance method, an electromagnetic An induction system or the like can be used.

Also, as shown in FIG. 35, the proximity object detection sensor Se3 and the contact object detection sensor Se3 are preferably arranged so as to extend linearly at the end of the imaging device 100B.
Moreover, in such a case, the sensor Se3 may have a plurality of areas along the extension direction, and may detect the approach or contact of an object for each area.
In this way, it is possible to determine the position of the nearby object or the contacting object with respect to the photographing device 100B, or whether the proximate object or the contacting object is located at a desired position (for example, the central portion of the photographing device 100B). can be determined.
Further, the sensor Se3 may notify the user of the detection result for each area.

[Positioning confirmation from captured image]
In addition, in view of the problem that it is necessary to position the subject S at a desired position of the imaging apparatus 100B when preparing for imaging, when performing still image imaging, or when performing serial imaging, one image captured during serial imaging is An image of the eye may be used to confirm whether or not the subject S is positioned at the desired position.

Specifically, for example, it is configured to operate according to the flow shown in FIG. First, the first image is taken (step S1), and the first image is obtained (step S2). Then, it is determined whether or not the subject S is positioned at a desired position (step S3). If it is determined in step S3 that the subject S is positioned at the desired position (step S3; Yes), the second and subsequent images are taken (step S4), and the process ends. On the other hand, if it is determined in step S3 that the subject S is not positioned at the desired position (step S3; No), that fact is notified (step S5), and imaging is stopped as necessary.

It should be noted that the determination of whether or not the subject S is positioned at the desired position in step S3 may be performed by changing the determination method and determination conditions for each imaging technique.
For example, by determining whether or not the image is bilaterally symmetrical from part or all of the image, it is determined whether or not the subject S is positioned in the center of the image. By comparing the image of the same composition as the image of the imaging technique to be imaged with the imaged image, it is possible to determine whether or not the subject S is positioned at a desired position.

If the subject S moves from the desired position before the imaging is started, there are cases where the imaging is not performed to obtain a photographic image that can be used for diagnosis. However, according to this embodiment, when it is determined that the image is not usable for diagnosis, the user is notified that the subject S is moving from the desired position. By confirming whether or not the image can be used for diagnosis, and stopping the imaging when it cannot be used for diagnosis, the subject S is prevented from being wastefully exposed to radiation. can be prevented.
Further, by automatically stopping imaging when it is determined that the subject S has moved from a desired position, it is possible to further prevent the subject S from being unnecessarily exposed to radiation.

If the information between a plurality of adjacent frame images obtained by serial imaging is important, not only the first image, but also a plurality of images from the first image until the information between the adjacent frame images can be discriminated. You may make it discriminate|determine based on the image of .
By doing so, it is possible to accurately determine whether an image can be used for diagnosis even in an imaging technique in which the difference between a plurality of adjacent frame images is important for diagnosis.

In addition, if the image processing takes a long time and the determination cannot be completed before the second image is captured, the image determination for the first image may be performed in parallel with the operation of capturing the second and subsequent images.
Specifically, it is configured to operate according to the flow shown in FIG. 37, for example. First, the first image is captured (step S11), and the first image is acquired (step S12). Subsequently, the imaging of the second and subsequent frames (step S13) and the confirmation of the imaging stop instruction (step S14) are alternately repeated, and in parallel, it is determined whether or not the subject S is positioned at the desired position. (step S15). If it is determined in step S15 that the subject S is positioned at the desired position (step S15; Yes), the process ends. Therefore, serial shooting can be continued to the end. On the other hand, if it is determined in step S15 that the subject S is not positioned at the desired position (step S15; No), an instruction to stop imaging is output (step S16). Then, since it is confirmed in the process of step S14 that there has been an instruction to stop photographing, this fact is notified (step S17), and photographing is stopped as necessary.

In this way, even if image processing takes a long time, imaging can be continued without delaying the imaging timing of the second and subsequent images, and when it is determined that the images are not usable for diagnosis, the subject can In order to notify the user that the S is moving from the desired position, the user can confirm whether the image being captured can be used for diagnosis by the notification, and cannot be used for diagnosis. In this case, by stopping imaging, it is possible to prevent the subject S from being unnecessarily exposed to radiation.
Further, by automatically stopping imaging when it is determined that the subject S has moved from a desired position, it is possible to further prevent the subject S from being unnecessarily exposed to radiation.
Also, in the above description, determination is performed for the first shot image of serial photography, but determination may be performed for the second and subsequent images instead of the first shot.
For example, the first photographed image may be unstable and unsuitable for determination because it is the first time that radiation is irradiated. In such a case, determination may be made by imaging after the first and subsequent images have stabilized radiation.
Also, depending on the imaging technique, the subject S may move in a permissible manner. For example, when the subject S breathes, body movement occurs according to the breathing. When it is desired to make a determination with respect to such a specific timing of the permissible body movement, the determination is made not on the first image but on the captured image corresponding to the timing of the imaging technique as described above. You can do it.

[Use of pressure sensor (2)]
When imaging, the subject S is required to be in sufficient contact with the imaging device 100B. However, since the imaging device 100B is installed on the back of the subject S, it is difficult to check whether the subject S is in sufficient contact with the imaging device 100B. As a result, although the subject S is away from the image capturing apparatus 100B, the user performs image capturing without noticing this, resulting in a problem that a desired radiographic image cannot be obtained.
In particular, in the follow-up observation before and after surgery, it is necessary to photograph changes over time such as the size of the affected area. Since it is difficult to confirm the contact state of the two, it was difficult to match the conditions.
Further, in serial imaging, the subject S may move and deviate from the desired imaging state after the user positions the subject S and before imaging is started or during imaging. In particular, when imaging a subject S lying on a bed, the imaging device 100B is not sufficiently fixed, and the slightest movement of the subject S causes the imaging device 100B to move, changing the positional relationship between the subject S and the imaging device 100B. , there were cases where the desired shooting conditions were not met.

In view of such problems, a pressure sensor that measures the pressure acting on the imaging device 100B and a display unit 41 that displays the measurement result of the pressure sensor may be provided.
As the pressure sensor, for example, a planar sensor that can measure the in-plane distribution of pressure and is arranged parallel to the radiation incident surface, or a pressure sensor that can measure a single point of pressure and is arranged in an array along the radiation incident surface. and the like.
In addition, the radiation entrance surface of the imaging device 100B is divided into a plurality of areas (upper and lower, left and right, or both), and a pressure sensor is arranged in each area to detect whether or not pressure is applied to each area. may
Also, a pressure sensor may be arranged to detect pressure at a specific site.

In this way, the display unit 41 can display the distribution of the measured values of the pressure sensor represented by ellipses as shown in FIG. can be displayed. From such information, it is possible to determine whether or not the subject S is in a state of being in sufficient contact with the imaging device 100B, and the user appropriately instructs the subject S on the state of contact with the imaging device 100B. Alternatively, it can be adjusted.

As shown in FIG. 38C, when the left and right pressure values (ellipse sizes) displayed on the display unit 41 are different, the contact of the subject S with the imaging device 100B is to the left or right. It may be biased. FIG. 38(c) illustrates a case where the left and right pressure values are different, but similarly, due to the difference in the upper and lower pressure values, the contact of the subject S with the imaging device 100B is biased to either the upper or lower side. state may be.
In this way, the user can estimate the contact state of the subject S with the imaging device 100B from the difference in pressure value, and the user can instruct the subject S to change the contact direction to an appropriate direction. can be done.

[Comparison confirmation with still image shooting]
In some cases, still images are captured before serial imaging is performed, and whether or not the subject S is positioned at a desired position on the imaging device 100B is checked using the captured still images. However, even if it is confirmed from the still image that the subject S is positioned at the desired position, the subject S or the imaging device 100B moves during the transition from the still image imaging to the serial imaging, and the desired imaging cannot be performed. There was no problem.
In view of such a problem, a still image captured in advance is stored, and then the still image is compared with the first frame image captured during serial imaging, so that the subject S can be positioned at a desired position. You may make it confirm whether positioning is carried out.
For example, it is possible to confirm by executing a process in which step S3 in FIG. 36 (determination of the first image) is changed to a comparison determination with a still image captured in advance.
The confirmation at that time can be automatically determined by performing, for example, a process of comparing the correlation between images in the determination unit.
As a result of the comparison, when it is determined that the difference between the first frame image and the still image is large, the user is notified of the difference, or the irradiation of radiation is stopped to stop the imaging.

In this way, when it is determined that the image cannot be used for diagnosis, the user is notified that the subject S is moving from the desired position. It is possible to prevent the subject S from being unnecessarily exposed to radiation by confirming whether or not it can be used and stopping the imaging when it cannot be used for diagnosis.
Further, by automatically stopping imaging when it is determined that the subject S has moved from a desired position, it is possible to further prevent the subject S from being unnecessarily exposed to radiation.

If the information between a plurality of adjacent frame images obtained by serial imaging is important, not only the first image, but also a plurality of images from the first image until the information between the adjacent frame images can be discriminated. You may make it discriminate|determine based on the image of .
By doing so, it is possible to accurately determine whether an image can be used for diagnosis even in an imaging technique in which the difference between a plurality of adjacent frame images is important for diagnosis.

In addition, if the image processing takes a long time and the determination cannot be made in time for the second photographing, as in the above "Positioning confirmation from the photographed image", one It is also possible to adopt a configuration in which image discrimination is performed for the first sheet.
In this way, even if image processing takes a long time, imaging can be continued without delaying the imaging timing of the second and subsequent images, and when it is determined that the images are not usable for diagnosis, the subject can In order to notify the user that the S is moving from the desired position, the user can check whether the image being captured is available for diagnosis by the notification, and it cannot be used for diagnosis. In this case, by stopping imaging, it is possible to prevent the subject S from being unnecessarily exposed to radiation.
Further, by automatically stopping imaging when it is determined that the subject S has moved from a desired position, it is possible to further prevent the subject S from being unnecessarily exposed to radiation.

[Body motion detection method (1)]
In serial imaging, it is difficult to distinguish whether the movement of the subject S is a specific body movement (breathing) to be diagnosed or a body movement other than the specific body movement that is not to be diagnosed. can be difficult to do.

In view of such problems, for example, as shown in FIGS. 39 and 40, the radiation imaging system is provided with a center-of-gravity detection device 100D for detecting the center-of-gravity position of the subject S, and changes in the center-of-gravity position during imaging are identified. Body motion other than body motion may be detected.
The center-of-gravity detection device measures the load at, for example, at least three points in the plane (the points may be aggregated and derived from the measurement of the linear pressure or the surface pressure) when the subject S is placed thereon. It is assumed that the center of gravity can be estimated from the coordinates of the points and the load values.
Further, the body motion detecting device 100C is provided with a function of determining presence/absence of body motion based on the transmitted time-series information of the center-of-gravity position.
When the body motion detecting device 100C determines that there is body motion, it notifies the user to that effect or stops the shooting.

Since the body movement due to respiration is very small, in this way, the body movement due to movement can be detected separately from the body movement due to respiration without attaching any special equipment to the subject S.
It is also applicable to multiple positioning (standing or sitting).
Also, it can be introduced to an existing radiation imaging system.
As in the first embodiment, the body motion detection device 100C may not be an independent device, but the console 4 may also serve as the body motion detection device 100C.
Alternatively, the body motion detecting device 100C may time-differentiate the center-of-gravity information arranged in chronological order, and use the amount of change as the determination criterion. In this way, erroneous detection can be reduced.

[Body motion detection method (2)]
In addition, in serial imaging, whether the movement of the subject S is a specific body movement (breathing) to be diagnosed or a body movement other than the specific body movement not to be diagnosed is determined only by the photographed image. In view of the problem that it may be difficult to distinguish between the two, the radiation imaging system is provided with a pressure detection means 100E for detecting the surface pressure due to the weight of the subject S, and the change in pressure is detected by a specific body during imaging. Body motion other than motion may be detected.
More specifically, a pressure sensor as the pressure detection means 100E may be provided in the panel-shaped photographing device 100B.
The pressure sensor may be integrated with the imaging device 100B. Alternatively, a sheet-shaped pressure sensor may be separately provided and attached to the photographing device 100B as required.
For example, as shown in FIG. 41, the pressure detection device can be arranged at the position where the subject S stands, the seat on which the subject S sits, the top of the bed, or the like so as to overlap the imaging device 100B.
Further, the body motion detecting device 100C is provided with a function of determining presence/absence of body motion based on the transmitted time-series information of the center-of-gravity position.
When the body motion detecting device 100C determines that there is body motion, it notifies the user to that effect or stops the shooting.

Body motion due to respiration is very small compared to body motion that affects images necessary for diagnosis, and the pressure change is sufficiently small compared to pressure changes due to body motion that affects images necessary for diagnosis. Since it is extremely small, it is difficult to be detected by the pressure detection means. Therefore, the pressure change detected by the pressure detecting means can be considered to be caused by body movement to the extent that the image required for diagnosis is affected. Therefore, in this manner, the body motion due to movement can be detected separately from the body motion due to respiration without attaching any special equipment to the subject S.

In the case of serial radiography, unlike still image radiography, normal body movements of the subject S can be radiographed as dynamics. Such normal body movements include, for example, breathing and heartbeat.
On the other hand, when photographing the normal body movement of the subject S, the subject S may move unintentionally by the user or may affect whether the diagnosis is possible. Such unintended body movements of the user or body movements that affect whether or not a diagnosis can be made include, for example, movements of the subject S tilting in the front, back, left, and right directions and falling down.
This unintended body movement of the user, or body movement that affects whether or not a diagnosis can be made, is often larger than normal body movement. , or the pressure change due to body movement, which influences whether or not the diagnosis is possible, is often large.
Therefore, when pressure is detected by the pressure detection means, and pressure fluctuations exceeding a specific pressure are detected, it can be considered that body movement that is not intended by the user or that affects whether or not the diagnosis is possible has occurred.

Therefore, in this way, unintended body movements of the user or body movements that affect diagnosis can be detected by distinguishing them from normal body movements without attaching any special equipment or the like to the subject S. can be done.
It should be noted that body motion detection using this pressure detection means can be applied to a plurality of positionings (standing or sitting).
Also, it can be introduced to an existing radiation imaging system.
The body motion detection device 100C may not be an independent device, but the console 4 may also serve as the body motion detection device 100C.

[Body movement control means]
Further, in the body motion detection using the body motion detection method described above, for example, as shown in FIG. The stagger of the subject S and the movement of joints may be physically restricted by f.
The fixing tool f may be fixed so as to straddle the joints of the subject S, such as the trunk and arms of the subject S, or the trunk and legs.
Further, the fixing tool f may be incorporated in a device or a tool, and may be configured to prevent the device or the tool from being displaced in addition to fixing the joint.
Further, the fixing tool f may be configured to be attachable to the photographing device 100B, such as a grip bar g.
Moreover, the fixture f may be provided in a device other than the imaging device 100B, such as a stretcher.
Further, the fixture f may have a structure that holds down the joint itself instead of straddling the joint to fix it.

By doing so, the body movement itself of the subject S can be reduced.
In addition, since the movement of bones is reduced, the accuracy of image processing can be improved and noise can be reduced.
In addition, it is desirable that the means for restricting body movement, such as the fixture f, be made of a material that easily transmits radiation. For example, it is desirable to use a material such as resin that easily transmits radiation, instead of using a material such as metal that does not easily transmit radiation.
Alternatively, it is desirable that the means for restricting body movement, such as the fixture f, be located at a position avoiding the region of interest to be observed by imaging.

[Body motion detection method (3)]
It should be noted that an acceleration sensor may also be used in photographing using the fixture f described above.
Specifically, the fixing tool f is provided with an acceleration sensor, and a transmission means for transmitting the signal to the body motion detection device 100C is provided.
Also, the body motion detection device 100C is provided with a function of determining presence/absence of body motion based on a signal from the acceleration sensor.
By doing so, the reliability of body motion detection is improved.

[Body motion detection method (4)]
Further, in photographing using the fixing tool f described above, a force detection sensor may be used together.
Specifically, a force detection sensor is provided on the surface of the fixture f that contacts the subject S, and transmission means for transmitting the signal to the body motion detection device 100C is provided.
Also, the body motion detection device 100C is provided with a function of determining presence/absence of body motion based on a signal from the acceleration sensor.
Note that the force detection sensor may be arranged only at one point to detect acceleration at one point, or a plurality of sensors may be consecutively arranged to estimate the body motion from the respective correlations.
Also, the sensor may have resolution in a certain range, or it may output only a high or low signal.
By doing so, the reliability of body motion detection is improved.

[Display of possible body movement range]
In the second embodiment of the second invention described above, the subject S is photographed by the optical camera 43 during radiography, and the region _R1 in which body movement of the subject S is allowed is derived from the photographed image. Or you may make it notify to a user.
Specifically, the console 4 or the like is provided with a function of deriving the permissible region _R1 in which the body movement of the subject S is permitted based on the captured image. The permissible region _R1 is displayed around the imaged subject S using the display unit 41 provided at a visible position.
In this way, by visually presenting the permissible region R ₁ (range) to the subject S, the subject S is warned not to leave the permissible region R ₁ . can be done.
It should be noted that the photographing may be stopped when the allowable region _R1 is exited.

[Subject holding part]
In addition, in the body motion detection methods (1) and (2) above, the fixture f that fixes the subject S is used, and the fixture f that can fix or regulate a part of the subject S prevents the subject from swaying or joints. may be physically restricted.
In particular, when the subject S is a human body or an animal, the subject S has concave portions and convex portions due to its biological structure. As a result, it becomes difficult to suppress the body movement of the subject S for a long time and maintain the initial posture of the subject S.

Therefore, as shown in FIG. 44, for example, the fixture f is formed in the shape of a flat plate on which the entire subject S can be placed, and has an opening O on the surface of which at least part of the body of the subject S enters. , unevenness, or a combination thereof.
In particular, if the part of the subject S that breathes, such as the face, is pressed, it becomes difficult for the subject S to breathe, causing more pain and discomfort, and it is more difficult to suppress body movement and maintain posture. becomes more difficult.
Therefore, as shown in FIG. 443, by providing a concave portion or an opening O in a portion of the fixture f that faces the breathing portion such as the face, the subject S can be prevented from feeling pain or discomfort, and can be held for a long time. It is possible to suppress body movement over a period of time.
The fixture f may be incorporated in the imaging table Ta itself, or may be detachable from the imaging table Ta.
By doing so, the body movement itself of the subject S can be reduced.
In addition, since the movement of bones is reduced, the accuracy of image processing can be improved and noise can be reduced.

[Body motion detection and shooting interruption]
In serial imaging, it is difficult for the user to quantitatively grasp body movements of the subject S occurring during imaging.
In view of such a problem, the body movement of the subject S that affects the dynamic analysis process may be detected from the captured dynamic image.
Specifically, for example, as shown in FIG. 45, the radiation imaging system measures the amount of movement of a specific region R ₃ of the body region R ₂ (outline) set in the captured image, An image processing device (not shown) is provided for determining whether or not body movement has occurred based _on the amount of movement of R3.
For detecting the body region _R2 of the subject S, for example, a discriminant analysis method can be used.
Template matching processing, for example _, can be used to measure the motion amount of the specific region R3.
When it is determined that body movement has occurred, the fact is notified to the user (displayed on the display unit 41), or photography is stopped.

In this way, the user can quantitatively determine whether or not re-imaging due to body movement is necessary, rather than intuitively.
Further, by detecting the body motion, the notification means such as the console 4, the speaker 31b, the display unit 41, or a lamp (not shown) can be used to notify the user that the body motion has occurred. In this way, the user can perform an operation such as releasing the depression of the exposure switch 31a by receiving the notification, thereby interrupting the imaging.
Alternatively, the photographing control unit 2 may be configured to automatically interrupt photographing based on the detection of body movement. Further, when shooting is automatically interrupted, it may be configured to notify that shooting has been interrupted due to body movement.

[Body movement level display]
Further, as described above, when the body movement of the subject S is detected from the dynamic image, the degree of influence of the body movement of the subject S occurring during imaging on the analysis may be determined.
Specifically, for example, as shown in FIG. 46(a), a specific region _R4 of the body region is designated, and an image processing device (not shown) is processed based on the measured amount of movement of the specific region _R4 . Provide a function to calculate the magnitude of the predicted impact that will occur in dynamic analysis processing.
The calculated degree of influence is displayed on the display unit 41 in the form of a graph, for example, as shown in FIG. 46(b).

Further, it is possible to adopt a configuration in which the magnitude, direction, timing, frequency, and the like of body movement are taken into account to calculate the degree of influence according to the type of analysis. In such a case, for example, as shown in FIG. 46B, the degree of influence may be notified to the user by displaying the degree of influence for each type of analysis.
For example, when analyzing the ventilation volume as A analysis processing, even if the subject S moves left and right within the allowable range, the size of the lung field for each frame image is analyzed and acquired from the captured image. It is possible to calculate the expansion/contraction amount of the lung field. Therefore, for example, if the analysis of the amount of expansion/contraction of the lung field is selected as the A analysis process in FIG.
On the other hand, when analyzing the movement of bones during breathing, if the user's unintended body movement other than breathing causes the whole body to move, the movement of the bones during breathing will be reflected in the body movement other than breathing. Since the movement is added by the user's unintended body movement, the degree of influence of the body movement increases. Therefore, for example, if bone movement analysis during respiration is selected as B analysis processing in FIG.

Depending on the analysis process selected in this way, the degree of influence of body movement varies depending on the size, direction, timing, frequency, etc. of body movement, and it is possible to display the degree of influence by calculating with an appropriate calculation method for each is.
It should be noted that the decision to stop shooting may be made by the user who has confirmed this display. In this way, the user can determine whether or not re-imaging due to body movement is necessary, taking into consideration the influence on the dynamic analysis process to be performed later.

[Judgement by level]
In addition, it is possible to set in advance the level of influence, which serves as a dividing point for determining whether re-imaging is possible or whether to interrupt the imaging.
In addition, when a preset level is exceeded, a notification means such as the speaker 31b, the display unit 41, or a lamp (not shown) is used to notify the user that body movement has exceeded the preset level. can also be
Alternatively, it is also possible to adopt a configuration in which control is performed so that re-imaging or interruption of imaging is automatically performed according to a level set in advance.

Further, as described above, when the body movement of the subject S is detected from the dynamic image, the body movement of the subject S occurring during imaging should be grasped not only quantitatively but also over time. good too.
Specifically, an image processing device (not shown) is provided with a function of outputting the determination timing when it is determined that body movement has occurred.
When it is determined that the body movement has occurred, the timing of the body movement and the amount of body movement are displayed, or the photographing is stopped. It may be displayed in the form of a graph as shown in FIG.
It should be noted that the decision to stop shooting may be made by the user who has confirmed this display.
In this way, the user can not only quantitatively determine whether or not re-imaging due to body movement is necessary, but also determine the timing of occurrence of body movement. You can judge the image.

It should be noted that the degree of influence on such analysis can be used not only at the time of photographing but also, for example, when analyzing the photographed image later. In other words, the degree of influence of body motion on the analysis method to be selected or selected may be displayed to present information to the user.

[Display of movement due to breathing]
Further, as described above, when detecting the body movement of the subject S from the dynamic image, it may be determined whether or not the detected body movement accompanies respiration.
Specifically, an image processing device (not shown) is provided with a function of detecting the body movement of the subject S, which affects the dynamic analysis process, from the recognition result of the body of the subject S. When motion is detected, the body motion generation timing and the amount of body motion are displayed on the display unit 41 of the console 4. - 特許庁

As a display method, for example, as shown in FIG. 48(a), specific areas R ₅ and R ₆ of the body area are specified, and the amount of body movement of the specified specific areas R ₅ and R ₆ is calculated. can do A specific body region can be identified by, for example, template matching processing, etc. By calculating the position of each image of the identified specific regions R ₅ and R ₆ , the amount of body movement can be calculated. The body movement amount to be calculated can be calculated as a distance, or can be calculated as a movement amount in a specific direction such as the X direction, the Y direction, or the body axis direction.
In addition, the calculated amount of body movement can be displayed in the form of a graph as shown in FIGS. is.
By setting the threshold value to a value larger than the average amount of movement in body movement associated with respiration, the user can grasp whether body movement larger than body movement associated with respiration has occurred.
Then, it becomes possible for the user who has confirmed this display to determine whether to stop shooting.

In this way, the user can quantitatively determine whether or not re-imaging due to body movement is necessary, rather than sensuously, and by knowing the timing of occurrence of body movement, the image can be used for diagnosis and during other periods. can be determined, and diagnosis can be performed using images in a time period that can be used for diagnosis when it is determined that no body movement larger than body movement accompanying respiration has occurred.
In addition, it can be determined whether the body movement is a movement accompanying breathing.
Note that, for example, as shown in FIG. 48, body movement amounts may be calculated for a plurality of specific regions R ₅ and R ₆ and determined from their correlation, or for one specific region R ₅ and R ₆ It is also possible to make a determination based on the amount of body movement.

[Judgment other than movement due to breathing]
Further, as described above, when the body movement of the subject S is detected from the dynamic image, the specific region for measuring the amount of movement is the region of the body that is assumed not to move with respiration (hereinafter referred to as immovable region). site) may be set.
Examples of immobile sites include the lumbar vertebrae, lung apex, lung apex line, and the like.
As a processing method for detecting a body motion for an immovable part, for example, the position of the immovable part or a template image It as shown in FIG. 49B is stored in advance in a console or a dedicated device. Then, as shown in FIG. 49(a), a partial image Ip of an immobile part is extracted from each captured image at a position specified in advance for each captured image, or is stored in advance. The position of the immobile part in the photographed image is extracted by comparing with the template image It. As a method of extracting a position using such a template image, a method of evaluating the correlation of images or a pattern matching process can be used.

For example, an image of the spine, which is a part that rarely moves with respiration, is stored in advance as a template image It, and the image correlation is evaluated for each captured image. A position is specified for each image taken. By specifying the position of the spine, it is possible to grasp the relative position of the spine for each image (distance from the short part of each image) in each of those images.

If the immovable part thus extracted moves during the imaging period, it can be determined that a movement other than breathing, that is, a body movement has occurred. Further, by further extracting feature amounts such as the amount of lateral movement and the amount of movement of the center of gravity of the extracted immobile part, it is possible to grasp the degree of body movement of the immovable part.
In such a case, furthermore, when it is determined that the feature amount exceeds a preset threshold value, the feature amount is detected by sound output from the speaker 31b, display on the display unit 41, light emission from a lamp (not shown), or the like. A configuration may be employed in which the user is notified that the threshold value has been exceeded, that is, that there is a possibility that an abnormality such as body movement has occurred.

Alternatively, when it is determined that the feature amount exceeds the threshold, radiation irradiation or imaging may be stopped, and the imaging may be interrupted or stopped. At this time, it may be configured to notify that the photographing has been interrupted or stopped because the feature value exceeds the threshold value by means of voice output from the speaker 31b, display from the display unit 41, or light emission from a lamp (not shown).
Alternatively, the feature amount may be displayed as a numerical value or a graph so that the user can recognize whether or not body movement that would require re-imaging has occurred.
In this way, it is possible to determine whether or not the body motion affects the dynamic analysis process when the body motion is detected.

[Body motion detection by lung field position]
There is a method of using a specific structure (including the above-mentioned immobile part) that is not affected by respiration to detect the body movement of the subject S that occurs during imaging. and its tracking was difficult for users.
In view of such a problem, the lung field region of each frame image is extracted, and a vertical center line Lc is drawn in each of the left and right lung fields, as shown in FIG. 50, for example. The occurrence of body motion and the amount of motion (translation, rotation, twist, hereinafter referred to as body motion information) caused by the body motion may be determined from the positional relationship between the two center lines Lc.

In particular, overall motions such as translation, rotation, and twisting may be difficult to grasp even if the motion of a specific portion of the image is tracked. By tracking the movement, it is possible to easily grasp the overall movement such as translation, rotation, and twist, and to calculate the amount of body movement as the amount of variation of the virtual line.
For this virtual line, for example, the center line Lc of the specific area, the symmetry line of the area having symmetry, etc. can be used to calculate the movement amount of the entire movement such as translation, rotation, and twist as the movement of the virtual line. becomes possible.
As the centerline Lc of the specific region, for example, the centerline of the lung field, the centerline of a specific organ, the centerline of a specific bone, and the like can be used.
As the symmetrical line of the symmetrical area, for example, the symmetrical line of the left and right lung fields, the symmetrical line of the left and right ribs, and the like can be used. In particular, since the human body has many organs arranged symmetrically, it is possible to use a method of calculating a line of symmetry for these organs and calculating the movement thereof.

If body movement is detected during imaging, it may be possible to prompt the user to stop imaging, or to continue imaging and correct the image using body movement information (equilibrium movement, rotation, twist). You may make it apply.
In this way, body motion information (parallel movement, rotation, twist) can be accurately extracted without detecting a specific structure that is difficult to detect.
In addition, it is possible to calculate quantitative values of body motion information (equilibrium movement, rotation, twist) as motion amounts of virtual lines such as the center line Lc and symmetry lines.

[Body motion detection by direct radiation area]
From the viewpoint of processing time, it was difficult to detect specific structures used for body motion detection during shooting (it was difficult to prepare software and hardware that could withstand real-time processing).
In view of such problems, the area of the direct radiation area Rd in which the subject S is not shown in each frame image is calculated during serial imaging, for example, as shown in FIG. You may make it judge generation|occurrence|production.
The direct radiation region Rd is a region where radiation enters the imaging apparatus 100B without passing through the subject S, and much stronger radiation than the region where the radiation enters through the subject S. Therefore, the density of the direct radiation area Rd in the radiation image Ir is much higher than that of the body area _R2 in which the subject S is imaged. Therefore, if the density threshold is set between the average density of the body region _R2 and the density of the direct radiation region Rd, it becomes possible to easily calculate the area of the direct radiation region Rd.
In this way, there is no need to detect a specific structure, and the process of extracting a solid portion is a simple process, so real-time processing can be performed even by using a processing device with low computational processing capability.

[Detection by change in region of interest]
In addition, in view of the problem that it was difficult to detect a specific structure used for body motion detection during imaging from the viewpoint of processing time, for example, as shown in FIG. A region (ROI) may be set, and the occurrence of body motion may be detected based on the disturbance of the density waveform extracted from the region of interest (ROI) during serial imaging.
Specifically, from the image data input to the console 4 or the like, the processing unit of the console 4 or the like analyzes the density and density change of the image of the region of interest (ROI) and generates time-series data. The generated time-series data (graph) may be displayed on the display unit 41 or the like so that the user can recognize the body motion occurrence timing.
Further, the density of the image of the region of interest (ROI) and a threshold value for density change may be set.

In addition, when the processing unit such as the console 4 determines that the density or density change of the image of the region of interest (ROI) obtained from the image data being captured exceeds a preset threshold value, the speaker 31b or the display unit 41. A lamp or the like (not shown) may be configured to notify the user that the density or density change of the image of the region of interest (ROI) has exceeded a threshold value, that is, that an abnormality such as body movement may have occurred. can.
Alternatively, as shown in FIG. 52(b), when it is determined that the image density or density change exceeds a threshold value, radiation irradiation or imaging may be stopped, and imaging may be interrupted or stopped. At that time, there is a possibility that an abnormality such as body movement has occurred due to the sound output of the speaker 31b, the display of the display unit 41, the light emission of a lamp (not shown), etc. Therefore, it is configured to notify that the photographing has been interrupted or stopped. good too.
In this way, there is no need to detect a specific structure, and since the density waveform extraction process is a simple process, real-time processing can be performed, and the possibility of process failure can be reduced. .

[Detection by dynamic analysis]
It has been difficult for the user to determine during imaging whether or not the captured dynamic image can be subjected to dynamic analysis processing without problems (mainly whether or not body movement has occurred).
Therefore, for example, as shown in FIG. 53, dynamic analysis processing is started using a predetermined number of frame images (N frames) obtained during serial imaging, and analysis results are displayed on the display unit 41 or the like from the middle of imaging. You may make it
In this way, it is possible to determine during imaging whether or not the captured dynamic image can be subjected to dynamic analysis processing without any problems. It is possible to prevent the subject S from being wastefully exposed to radiation.

[Detection by region of interest and imaging region]
Serial photography may be continued in a situation where a desired region to be photographed has not been photographed. In that case, the subject will be unnecessarily exposed to radiation.
In view of such a problem, when a desired imaging target area is out of the imaging range during serial imaging, a message may be displayed on the display unit 41 or the like prompting the user to stop imaging even if the amount of body movement is at least good.
Whether or not the imaging target area is out of the imaging range can be determined by determining whether or not the contour line Lo of the imaging target area intersects the edge E of the image, as shown in FIG. 54, for example.
For such determination, the processing unit such as the console 4 extracts the region of interest of each image from the input image data and creates a contour line Lo framing the contour. It is possible to use a configuration that calculates and determines whether or not it intersects the edge E of the captured image.

In such a case, further, when it is determined that the contour line Lo intersects the edge E of the image, the contour of the region of interest is displayed by the sound output of the speaker 31b, the display of the display unit 41, the light emission of a lamp (not shown), etc. It is possible to notify the user that the line Lo has crossed the edge E of the captured image, that is, that there is a possibility that an abnormality such as body movement has occurred.
Alternatively, when it is determined that the contour line Lo of the region of interest intersects the edge E of the captured image, radiation irradiation and imaging may be stopped, and the imaging may be interrupted or stopped. At that time, it is notified that the imaging has been interrupted or stopped because the contour line Lo of the region of interest intersects the edge E of the captured image by voice output from the speaker 31b, display on the display unit 41, light emission from a lamp (not shown), or the like. may be configured.
Alternatively, by calculating the distance between the contour line Lo and the edge E of the photographed image and displaying this distance as a numerical value or a graph, it is possible to determine whether the region of interest is approaching the edge of the photographed image. The user may be able to recognize to what extent it is. Alternatively, the distance between the contour line Lo and the edge E of the photographed image may be repeatedly calculated, and when this distance becomes equal to or less than a specific distance, the above warning or photography may be stopped.
By doing so, it is possible to reduce the possibility of inadvertently continuing serial imaging in a situation where the desired imaging target area has not been imaged.

[Detection by specific area]
It was difficult to distinguish specific body movements associated with respiration from other body movements only by uniform movements.
_{In view} of such _problems , for example, as shown in FIG. It may be determined that there is body motion other than the specific body motion when the basic motion in _R9 is not met.
Specific regions R ₃ to R ₅ include shoulders, flanks, diaphragm and the like. Since the amount and direction of movement of these parts during normal breathing are determined to some extent, thresholds for the amount and direction of movement are set in advance as permissible ranges for each of the specific regions R ₇ to R ₉ . Then, when it is determined that the motion amount and direction of the detected specific regions R ₇ to R ₉ exceed the threshold value, it can be determined that body motion has occurred.

For example, the shoulders and diaphragm basically move vertically during breathing. As for the amount of motion, it is possible to set the maximum amount of motion from imaging of a general respiratory condition.
Specifically, the shoulder is set as a specific region R ₇ and the diaphragm is set as a specific region R ₈ , and the lateral movement amount different from the basic movement is evaluated for these specific regions R ₇ and R ₈ . By doing so, it is possible to determine whether the designated shoulder or diaphragm movement differs from the basic movement associated with respiration at the time of imaging or at the time of image analysis after imaging.
In addition, the flanks during breathing basically move left and right. As for the amount of movement, it is also possible to set the maximum amount of movement based on imaging of general respiratory conditions.
Specifically, the flanks are set as a specific region _R9 , and by evaluating the amount of movement in the vertical direction that is different from the basic movement in this specific region _R9 , the image at the time of shooting or after shooting is evaluated. At the time of analysis, it is possible to determine whether the designated flank movement differs from the basic movement associated with respiration.

Note that, when it is determined that there has been body movement, a configuration can be employed in which a message prompting the user to stop shooting is displayed on the display unit 41 or the like.
In addition, the user is notified that there is a possibility that body movement other than breathing has occurred in the specific regions R ₇ to R ₉ through voice output from the speaker 31b, display from the display unit 41, light emission from lamps (not shown), and the like. can also be configured.
Alternatively, when it is determined that the motion amount or direction of the detected specific regions _R7 to _R9 exceeds the threshold value, radiation irradiation or imaging may be stopped, and imaging may be interrupted or stopped. At this time, it may be configured to notify that the photographing has been interrupted or stopped due to the occurrence of body movement in the specific region R3 by voice output from the speaker 31b _, display from the display unit 41, light emission from a lamp (not shown), or the like.
Further, it is possible to adopt a configuration in which the threshold values set for each of these specific regions R ₇ to R ₉ , the amount of movement and the direction of movement can be set independently.
For the specific regions R ₇ to R ₉ , the amount and direction of movement associated with specific body movements are determined to some extent, so body movements can be detected with high accuracy according to this embodiment.

[Analysis during shooting]
With dynamic images obtained by serial imaging, it was not possible to determine whether or not desired imaging was performed until after dynamic analysis processing (for example, ventilation analysis, etc.) was performed.
In view of such problems, dynamic analysis processing is started sequentially from frame images transmitted from the imaging device 100B during serial imaging, and it is determined during imaging whether or not the analysis result is a desired result. may

Dynamic analysis processing is performed by the console 4 or a dedicated device.
Then, the console 4 or a dedicated device performs processing as shown in FIG. 56, for example. First, a frame image is received (step S21), and the received frame image is analyzed (step S22). Specifically, for example, it is determined whether or not the difference from the previous frame image is greater than or equal to a predetermined value, or whether or not the difference is large compared to the data of the analysis result that serves as a template. Here, if the analysis result is the desired result (the difference is small) (step S23; Yes), the process returns to step S21 to continue receiving frame images. On the other hand, when it is determined that the result of the analysis is not the desired result (step S23; No), the user is notified to that effect or the photographing is stopped.
Note that these operations can be configured to be performed in parallel with imaging during imaging in another specified imaging period.
In this way, it is possible to determine during imaging whether or not the desired analysis result has been obtained, and by notifying or canceling the imaging according to the result, the subject S is unnecessarily exposed to radiation. You can prevent it from slipping.

[Image transfer during shooting]
A dynamic image obtained by serial imaging is composed of many frame images and has a large amount of data. Therefore, in the case of wireless communication, it takes time to transfer the image to an image server (PACS, etc.).
In view of such a problem, frame images output by the imaging device 100B during serial imaging may be sequentially transferred to the image server instead of transferring dynamic images after serial imaging is completed.
Note that the access point used at that time is the same as the one that was connected immediately before shooting.
The access point is for communicating with the console 4 and is connected to the image server over the network.
During serial imaging, the console 4 does not move, and the possibility of communication with the access point connected immediately before imaging being interrupted is low. can.

[Display delayed image]
In the case of serial photography, final confirmation of the photographed image cannot be performed until after the photography is finished. Therefore, if re-imaging is to be performed as a result of confirmation, the subject S will be unnecessarily exposed to radiation for one serial imaging.
In addition, if real-time frame images are displayed, for example, the user cannot confirm the captured images during the period in which the subject S is directly viewed. Particularly in the initial stage of imaging, the user may start the imaging operation while directly looking at the subject S, and in such a case, the user cannot confirm the captured image immediately after the start of imaging.
In addition, the body movement appearing on the surface of the subject S can be confirmed by photographing the subject S while directly checking the subject S, but the internal body movement that does not appear on the surface of the subject S can be confirmed in the captured image. It cannot be confirmed without confirming the On the other hand, it is easier to confirm the condition of the subject S, such as the subject S being in pain, by directly viewing the subject S.

In view of such a problem, during the serial shooting, the frame image taken several seconds ago is displayed on the display unit 41 of the system main body 100A instead of the real-time frame image currently being taken (the time lag in displaying the image is reduced). to hold).
In this manner, by displaying a frame image captured a little while ago instead of a real-time frame image, the user can start the imaging operation while directly viewing the subject S only in the initial stage of imaging, and then display the display unit 41 or the like. , it is possible to perform imaging while confirming the captured image over the entire imaging period, which is more important than visual observation in making a diagnosis.
Further, the configuration according to the present invention, in which the photographed image is displayed with a slight delay, makes it possible to confirm the condition of the subject, such as whether the subject is suffering in the early stages of imaging, before starting imaging, and After that, while confirming the photographed image displayed with a delay, if there is no abnormality, photographing is continued, so that the photographed image can be confirmed and photographed over the entire photographing period. On the other hand, if there is an abnormality such as body movement or image loss, the user can decide to stop shooting in the middle of shooting. Exposure dose can be reduced.
Alternatively, a dedicated device having this lag display function is provided.

In addition to simply delaying the display of the frame image, image editing such as adding some kind of mark (annotation, stamp, etc.) may be performed before the frame image is displayed. Specifically, for example, a stamp such as "L" or "R" indicating the shooting direction of the image may be given during this period.

[Add check for confirmation result]
Further, as described above, if the frame image taken several seconds ago is displayed on the display unit 41 or the like instead of the frame image currently being taken, an arbitrary frame image may be checked. good.
Specifically, the console 4 or a dedicated device is provided with a function as image checking means for adding some kind of mark (annotation, stamp, etc.) to a plurality of displayed frame images (not in real time).
Such marks may be added to the frame image specified by the user or frame images before and after the specified frame image.
Alternatively, as described above, it is assigned to the frame image for which the console 4 or the like has determined that the above-described thresholds for body movement or image density have been exceeded, or the frame images before or after the frame image for which the console 4 or the like has determined that the above thresholds have been exceeded. It can be configured to

It is also possible to provide a function to collect only the checked frame images in another folder H and a function to transfer only the checked frame images to an external image server.
When displaying a frame image taken several seconds ago, it may be troublesome to search for and redisplay the frame image in which an abnormality is observed. In addition, by having a function to mark the frame images, the user can immediately search for images of high interest after taking them, and can quickly decide whether or not to retake images and select images to be diagnosed. can be done.

[Crop image]
Further, as described above, when the frame images are checked, the checked frame images may be automatically cut out and displayed after the photographing is completed.
Specifically, the console 4 or a dedicated device is provided with a function as image clipping means for clipping the checked image and displaying only the checked image.
Note that the clipped image may be a still image or a video obtained by clipping a part of a video.
In addition, a function of collecting only the checked frame images in another folder H and a function of transferring only the checked frame images to the image server may be provided together.

In addition, as described above, if frame images are checked, it may be troublesome to re-display frame images in which an abnormality is observed or to cut out such frame images. In this way, it is possible to immediately find a frame image in which an abnormality is observed during photographing. In addition, the user's trouble of removing (trimming) unnecessary frame images can be reduced.

[Check by image difference]
Further, as described above, if the frame image captured several seconds ago is displayed on the display unit 41 or the like instead of the currently captured frame image, a frame image having a large difference between before and after is displayed as a mark. You can put it on.
Specifically, the console 4 or a dedicated device has a function of calculating a difference between an acquired frame image and a previously acquired frame image, and determining whether or not the difference exceeds a predetermined threshold, It has a function as an image checking means for adding some sort of mark (annotation, stamp, etc.) to the frame image for which the difference is determined to exceed the threshold.
Note that not only the frame image with the large difference, but also several frame images before and after it may be marked.

When displaying a frame image taken several seconds ago, it may be troublesome to search for and redisplay the frame image in which an abnormality is observed. The frame image to be captured can be found immediately with higher accuracy during shooting. In addition, the user can search for an image of high interest immediately after imaging, and can immediately determine whether or not to re-image and select an image to be diagnosed.

[Adjustment of irradiation field]
If the subject S moves during serial imaging, the irradiation field of radiation shifts, uneven dose between frame images, and failed frame images occur, resulting in analysis results in later processes. There was a problem that it would affect the
In view of such problems, the collimator of the radiation imaging system provided with the body motion detection device 100C of the second invention has a function of narrowing or expanding the irradiation field of radiation based on the information from the body motion detection device 100C. Alternatively, an irradiation field moving device for moving the irradiation field in a direction orthogonal to the optical axis Ao may be provided.
A camera, a pressure sensor, and the like are examples of means for detecting body movement.
In this way, even if the subject S moves unexpectedly during serial imaging, by moving the irradiation field, it is possible to suppress uneven dose between frame images, an increase in noise in images, and the like.

[Adjust volume]
When imaging is performed using the mobile 100A at the bedside of the subject S in a general ward or the like, the radiation source 34 is near the subject S, so the buzzer that notifies radiation irradiation is heard loudly. Since most subjects S do not experience radiography on a daily basis, there is a high possibility that they will react sensitively to the sound generated from the radiation source 34 . In addition, in general hospital wards, other patients are nearby, and these people may also be afraid of invisible radiation. In particular, in serial imaging such as imaging of body movement such as breathing, the generated buzzer sound is long, which may give the subject S or other patients a great sense of uneasiness. However, the buzzer sound is for notifying that radiation irradiation is being performed, and is necessary information for the user.

In view of such problems, the volume of the buzzer that notifies radiation irradiation may be adjustable.
Specifically, for example, as shown in FIG. 57, the operation unit 31 to which a speaker 31b that emits a buzzer sound is connected through the operation unit 31 may be provided with a dial for adjusting the volume in terms of hardware, for example. Alternatively, a touch panel or buttons used for setting imaging conditions may be used together.
It is possible to remove anxiety about the body S and surrounding people.
It should be noted that the volume may be adjusted while a buzzer is sounded. This makes it easier for the subject S and the user to adjust the sound volume appropriately.

[Use of intermittent sound]
The buzzer that notifies radiation exposure is emitted only while radiation is being irradiated, but in serial imaging that repeats irradiation of pulsed radiation, there is a gap between the timing of one radiation exposure and the timing of the next radiation exposure. It's too short, and it sounds like a continuous buzzer. If the buzzer sounds continuously for a long time, the subject S may feel a great sense of uneasiness, and the subject S may not be able to perform a stable breathing action.
In view of such problems, the buzzer sound during serial imaging may be an intermittent sound that repeats on/off at a cycle longer than the irradiation cycle of radiation, as shown in FIG. 58, for example.
It is preferable that the interval at which the buzzer is turned off should not be too long so that the user does not misunderstand that the irradiation has ended.
It should be noted that the ON time and OFF time of the buzzer sound may be adjusted according to the user's preference.
In this way, in serial imaging that requires a long time, it is possible to eliminate the anxiety of the subject S and surrounding people without impairing the function of notifying the irradiation information of the buzzer sound.

[Notification other than sound]
In addition, in view of the problem that the buzzer that notifies radiation irradiation may be heard loudly and may give a sense of anxiety to the subject S and other patients, for example, as shown in FIG. A vibration source 31c that generates a vibration that can be felt by the user during radiation irradiation may be provided in switches for instructing the start of radiation irradiation, such as the exposure switch 31a.
When the operation unit 31 is provided with the button 31d, for example, as shown in FIG. 59(b), the vibration source 31c may be provided behind the button 31d.

Switches for starting and continuing radiation exposure must be kept pressed during radiation exposure. In other words, the user is in constant contact with the switches during irradiation. Therefore, according to this embodiment, it is possible for the user to recognize the information during radiation irradiation by the vibration of the switches that the user is constantly in contact with. The user can perceive radiation generation information without relying on visual, LED, or screen displays. Since the vibration information is not transmitted to the subject S and the surrounding people unrelated to the imaging, it is difficult for them to notice that the radiation is being irradiated, and the tension and anxiety about the imaging can be removed.

Note that radiation irradiation information may be transmitted to the user using bone conduction. Also, the bone conduction device may be connected either by wire or wirelessly.
In this way, only the user can receive radiation without interfering with communication with the subject S, the voice of the subject S during imaging, the airway sound that vibrates the eardrum through normal air, such as the sound of equipment. The irradiation information can be recognized as sound.

[Use of pre-sound]
In serial imaging, there are cases where it is desired to image the state of the lung field while breathing in a resting state. However, since radiography is an extraordinary activity, it is expected that the subject S will be in a tense state and become mentally unstable.
Before radiography, the user communicates with the subject S to keep the subject S in a calm state to some extent. and continues to ring while irradiation is being performed. Moreover, when irradiating radiation, a mechanical sound is generated from the system main body 100A. By hearing these sounds, the subject S may recognize that radiography has started or is in progress, and may fall into a state of tension again and be unable to breathe in a resting state.

In view of such problems, the exposure switch 31a, which normally has a first switch for instructing the start of exposure preparation and a second switch for instructing the start of exposure, is provided with a third switch, for example, as shown in FIG. Then, before the first switch is pressed (step S34), the third switch is pressed (step S31), and a buzzer sound (second A buzzer sound) may be sounded (step S32).
The second buzzer sound is made to be different from the first buzzer sound for notifying the irradiation of radiation and the first buzzer sound so that the difference between the first buzzer sound and the first buzzer sound can be judged.
In this way, the subject S will obtain information similar to that during imaging, and it is expected that the subject S will be in a tense state temporarily. can give When the subject S has become accustomed to the current state and has calmed down, the user can press the first switch and the second switch to perform imaging.

Although the configuration using the third switch has been described here, the present invention can also be applied when the third switch is not used. For example, even in a device configuration having only the first and second switches, for a certain period of time after pressing the first switch, the same operation as when the third switch is pressed is performed (preliminary buzzer sound (first It can be configured to sound two buzzers). In that case, after a certain period of time has passed while the first switch is pressed, the same operation as when the first switch is pressed may be performed.
By performing such control, even in a device having only the first and second switches, the buzzer sound can be generated in advance in the same way as the device having a third switch in addition to the first and second switches described above. Imaging can be performed after the subject S has become accustomed to the ringing.

In addition, the sound generated by the third switch is not the same as the buzzer sound indicating that radiation irradiation is in progress, but the sound that the subject S cannot hear (volume, tone color, etc.) ) can be used. In this way, environmental changes to the subject S can be reduced.
Also, music or the like may be used instead of the single-tone buzzer. In this way, the subject S can be made more calm.
Alternatively, the sound volume of the buzzer for notifying radiation irradiation may be set higher than that of the buzzer, so that the subject S may be accustomed to the situation with a loud sound first, then the imaging may be started, and the sound volume may be reduced later. In this way, the sound volume is reduced, so that the feeling of oppression that the subject S receives can be reduced, and the user can recognize that the radiation is being irradiated.

Alternatively, the user may be notified that radiation is being irradiated by means other than sound. In this way, environmental changes to the subject S can be reduced.
Further, the third switch is not provided, the switch information is not transmitted to the radiation source 34 by pressing the first switch, and the first switch information is transmitted to the radiation source 34 after the set time has elapsed, and the imaging operation is performed. may be performed. In this way, it is possible to limit the waiting time for the subject S to stabilize, thereby improving the operability.
Further, another measuring device may be used to determine whether the subject S is in a stable state. For example, a device for measuring heartbeats is used to check the value of heartbeats, or a device for measuring respiration is used to check the amount of suction and exhaustion. In addition, using these measuring instruments and IF, information is taken into the system, and using the values obtained by the system, it is automatically determined that the system is in a stable state, and an image is taken. At this time, if a stable state cannot be obtained even after a certain period of time has passed, the system may determine that an error has occurred, notify the user, and temporarily stop photographing. In this way, by obtaining the stable state of the subject S from the measurable physical condition, it is possible to make a judgment based on scientific grounds, thereby reducing the user's judgment and improving the operability.

Also, in order to let the subject S hear the sound generated by the third switch, a device such as a headphone or an earphone is used to hear the sound with priority over other sounds. In this case, since instructions from the user cannot be heard, the user may transmit instructions to the subject S through a microphone. In addition to the auditory sense, VR is turned on so as not to take in unnecessary visual information, and the subject S is shown an image that calms the subject S down. In this way, external information about the subject S is restricted, and environmental changes can be reduced.
Also, the image to be displayed may be an image that is completely unrelated to the shooting (for example, a natural scenery that makes people feel relaxed). In this way, the subject S can be made to forget the state of being radiographed, and can be brought into a mentally comfortable state.
Also, the image to be displayed may be the subject S itself. In this way, the subject S can grasp and understand the imaging situation, and the cooperation of the subject S with respect to imaging can be expected.

[Use of remote sound]
When imaging is performed at the bedside of the subject S in a general ward or the like using the mobile 100A, there is a possibility that the subject S will be surprised, tense, or uncomfortable with the buzzer sound that notifies the generation of radiation.
In view of such a problem, the speaker 31b that emits the buzzer sound may not be built in the medical cart 100A, but may be kept away from the medical cart body 101 as shown in FIG. 61, for example.
The speaker 31b may be normally attached to the medical vehicle main body 101 and may be detachable as needed.
The connection between the speaker 31b that emits the buzzer sound and the main body 101 of the medical vehicle may be wired or wireless.

In this way, the speaker can be kept away from the subject S, and the anxiety of the subject S due to the buzzer sound during imaging can be alleviated.
In addition, although the user may operate away from the medical vehicle body 101, by bringing the speaker 31b closer to the user, the user can hear the buzzer sound closer than when the medical vehicle body 101 has the speaker 31b. You can check with

A speaker may be incorporated in the exposure switch 31a, and a buzzer may be sounded by the exposure switch 31a. In this way, the user always holds the exposure switch 31a when performing radiation irradiation, so the position is closest to the user and far from the subject S. The user does not need to install a separate sound source, and can simply carry out the operating procedure as usual.
Also, the direction of the speaker may be changed. In this way, the sound volume for the subject S can be lowered by manipulating the output direction of the sound.
In addition, an optical camera 43 is attached to the collimator, and a display unit 41 that can be separated from the main body 101 of the medical vehicle 101 together with the exposure switch 31a and the speaker and that can display images is provided. The appearance of the specimen S may be displayed on the display unit 41 . In this way, even if the subject S is moved to a position where the subject S cannot be seen in order to further prevent the user from being exposed to radiation, the situation of the subject S can be grasped in real time through the image.

[Radiation irradiation instruction switch]
The exposure switch 31a (radiation irradiation instruction switch) is a two-stage push-in type that is pushed only with the thumb. exposure is started. Since the exposure switch 31a requires a certain amount of force to press it, a sufficient operational feeling can be obtained. However, when serial imaging is performed, it takes a relatively long time (approximately 20 seconds) to perform imaging, so it is difficult to keep pressing the exposure switch 31a.
In view of such a problem, the switch for preparing for exposure (first step) and the switch for starting exposure (second step) may be separated into different buttons.

As a specific switch configuration method, for example, as shown in FIGS. 62(a) and 62(c), the first stage button B ₁ is on one side of the main body, and the second stage button B is on the other side. ₂ , or, as shown in FIG. 62(b), at least one of the first stage operation and the second stage operation can be of a rotary type.
In this way, it is possible to operate by using a part other than the thumb or putting the weight on it, and it is possible to reduce the burden on the thumb while maintaining a sufficient click feeling and operation feeling.

[Remaining shooting time display]
In the serial imaging, unlike the still image imaging, the imaging does not end immediately. Therefore, there is a problem that the subject S feels fear and caution about the imaging, and the desired imaging cannot be performed. For example, in pulmonary respiration imaging, when the subject S feels fear or caution, the subject S may enter a respiration state different from the respiration state at rest, making it difficult to image a desired normal respiration state. rice field.
In view of such problems, the subject S may be notified of the remaining imaging time during imaging.
Specifically, for example, a display unit 41 (see FIG. 30) is provided at a place visible from the subject S, and the number of seconds left for imaging is displayed there.
In this way, it is possible to appropriately inform the subject S of how many seconds the imaging will end, so that the subject S can receive the imaging with peace of mind.
In addition, since the subject S can be photographed with peace of mind, it is possible to perform imaging in an imaging state that cannot be performed when the subject S is in a tense state, such as a breathing state during normal times.

[Protection from Radiation]
When a plurality of subjects S are examined by radiography in the same room, the radiation emitted from the radiation irradiation unit 103 is emitted not only to the subject S to be imaged, but also to the surrounding subjects S. is exposed to the radiation emitted from the radiation irradiation unit 103 . In particular, when serial imaging is performed, exposure of the surrounding subject S to radiation may become a problem because the imaging period is long.
In view of such problems, for example, as shown in FIG. 63, a shielding wall 103c opening in the irradiation direction of the radiation X may be provided around the collimator 35 .

The shielding wall 103c can be made of, for example, glass containing lead so as to block transmission of radiation.
The shielding wall 103c may be provided with a window W for viewing the inside, or may be made of a transparent or translucent material.
In this way, irradiation of radiation in unintended directions can be suppressed, and exposure of other subjects S in the same room as the subject S to be radiographed can be suppressed.
In addition, it is possible to reduce the radiation exposure of the subjects S, doctors, family members, etc. who are not in the same room but separated by the walls of the rooms.

[Understanding the total radiation dose]
When a plurality of subjects S are examined by radiography in the same room, the radiation emitted from the radiation irradiation unit 103 is emitted not only to the subject S to be imaged, but also to the surrounding subjects S. is exposed to the radiation emitted from the radiation irradiation unit 103 . In particular, there has been a problem in that imaging may be performed with an unintended high dose due to an erroneous input of imaging conditions by the user.
In view of such problems, for example, as shown in FIG. 64, not only the radiation dose for one image is calculated, but also the radiation dose for the entire imaging period is calculated (step S42). (Step S43; High), the user may be notified of this (Step S44), or radiation irradiation may not be performed.
The dose may be input and set for each imaging procedure, or when an imaging procedure is ordered by the RIS or HIS, or when the user selects an imaging procedure from among them, or when the user arbitrarily selects an imaging procedure. If selected, the dose associated with the imaging technique may be set.
In this way, imaging is performed with a high dose during the entire imaging period, which is contrary to the intention of the user, and the subject S, the surrounding subject S, medical staff, family members, and other related parties are unnecessarily exposed to radiation. You can prevent it from slipping.

[Exposure protection with curtains]
Further, when a plurality of subjects S are examined in the same room by radiation imaging (especially serial imaging), radiation emitted from the radiation irradiation unit 103 is emitted not only to the subject S to be imaged but also to the surroundings. In view of the problem that the surrounding subject S is exposed to the radiation emitted from the radiation irradiation unit 103, the curtain for visually isolating the subject S may be made of a material that does not easily transmit radiation. good.
Specifically, by mixing metallic fibers into the fabric of the curtain or by using metallic foil, the transmission of radiation is suppressed.
In this way, it is possible to suppress the exposure of other subjects S in the same room as the subject S for which radiography is to be performed.
In addition, it is possible to reduce the radiation exposure of the subjects S, doctors, family members, etc. who are not in the same room but separated by the walls of the rooms.

[Detection using markers]
When performing serial imaging, the user desires to image only the movement of the subject S to be imaged (for example, breathing during pulmonary imaging). However, there are cases where the subject S performs an action that is not desired to be imaged (for example, a body movement that moves the body up, down, left, right, back and forth) in addition to the action that is desired to be imaged. If the user can notice such an action that the user does not want to be photographed, the photographing is stopped at that point, so that the subject S is not wastefully exposed to radiation. However, if the user does not notice an action that the user does not want to capture, the serially captured images that have been captured cannot be used, but the image is captured to the end, and there is a risk that the subject S will be exposed to radiation unnecessarily. there were.
In addition, if the user notices an action (body movement) that the user does not want to shoot in the preview after shooting has been completed, the shooting time and the preview time are wasted. In particular, when the shorter the time spent on imaging in the ICU or the like, the better, such lost time becomes a problem.

In view of such problems, on the surface of the subject S, for example, as shown in FIG. 65, a marker M having a radiation transmittance different from that of the surroundings may be attached.
Here, "radiation transmittance is different from surroundings" means that, for example, when the subject S is a human body, the transmittance is different from the air around the marker M and the skin and body tissue of the human body.
The marker M is desirably attached to a part where the user does not move with respect to the subject S in a motion desired to be imaged, or where the direction of movement in a motion desired to be imaged is known. Specifically, for example, during lung radiography, it is desirable to attach the tape to the body surface such as the spine and shoulder blades.

Then, serial imaging is performed on the subject S, the movement of the marker M is evaluated between consecutive frame images, and it is determined whether or not the movement of the marker M other than the movement to be photographed exceeds the threshold value. do.
If the threshold is exceeded, a warning is sent to the user or the shooting is stopped.
In this way, it can be detected from the movement of the marker M whether or not the subject S is performing an action that the subject S does not want to be photographed.
In addition, when an action that is not desired to be photographed is detected, the user is warned to that effect or the photographing is stopped, thereby preventing the subject S from being unnecessarily exposed to radiation.

It should be noted that the direction in which the marker M moves may be detected instead of whether or not the marker M is moving.
At that time, not only the direction in which the marker M moves, but also the timing at which the marker M moves may be taken into consideration for determination.
Also, for example, as shown in FIG. 66, three or more markers M may be attached to detect movement. In this way, it is possible to calculate six-dimensional movements of X, Y, Z, α, β, and γ.
Also, in order to improve the robustness of the calculation, it is desirable to set the number of markers M to four or more and calculate from their movements. Furthermore, it is desirable to set the number of dimensions to six, which is the same as the number of dimensions to be measured, and to calculate from the movement of those markers M.
In this way, by grasping the movement of the subject S in multiple dimensions, it is possible to correctly communicate in which direction the movement of the subject S is unfavorable. It can encourage you to restrain yourself from moving.

[Measurement of distance using markers]
In radiation imaging, it is necessary to adjust the SID and perform imaging. However, since the radiation irradiation unit 103 that determines the focus F of the radiation and the imaging apparatus 100B change depending on the imaging technique, the imaging situation, and the condition of the subject S, it was difficult to grasp the SID and adjust it to a predetermined SID.
In view of such problems, for example, as shown in FIG. The SID may be calculated based on the body pressure B of S or the like.
The distance d between the markers M may be measured in advance, or the markers M may be attached at a predetermined distance.
Also, the distance df between the markers M is calculated from the radiation image.
The body thickness B of the subject S may be an estimated value, or may be a measured value obtained by other optical measuring means or the like.

The relationship between the marker M distance d, the photographed marker M distance df, the body thickness B, and the SID is expressed by the following formula (11).
(SID-B): d = SID: df (11)
From this equation (11), the SID can be calculated as in equation (12) below.
SID=df·B/(df−d) (12)
In this way, the SID can be grasped as a numerical value, and the user can easily adjust the SID.

For the body thickness B, when an order is sent from the RIS or HIS, a standard value is automatically set according to the age and sex of the subject S based on information such as the age and sex of the subject S. may correct the set value, or may automatically input an estimated value calculated from information such as waist circumference and chest circumference.
In this way, the work load can be reduced by simply inputting the body thickness information.
In addition, if the user neglects to input the body thickness information, for example, the body thickness information of the previous subject S remains, and an incorrect SID based on the body thickness information is displayed. can be prevented from being adjusted to

Further, in order to reduce the total exposure dose of the subject S, it is desirable that the radiation irradiation for adjusting the SID is performed at a lower radiation irradiation intensity than the radiation irradiation for acquiring the radiographic image used for diagnosis or the like. Therefore, radiation imaging for SID calculation can be performed before radiation imaging used for diagnosis or the like, and SID can be adjusted. Therefore, it suffices if the distance between the markers M can be calculated from the captured image, and radiography may be performed at a radiation irradiation intensity that is weaker than the radiation irradiation intensity for radiography used for diagnosis or the like.
In this way, the total radiation exposure dose of the subject S can be reduced.

Also, for radiation images used for diagnosis, etc., the SID may be calculated by the method described in the present invention, displayed to the user, and sent to the image server as information associated with the image. good.
Even if the SID is measured when the SID is adjusted before imaging, if the SID changes due to the movement of the subject S immediately before or during imaging, the SID in the imaged state may be the same as the SID adjusted in advance. Since the SIDs are not always the same, it is important to know the SID in the state in which the image was taken. In this way, it is possible to know the SID in the state in which the image used for diagnosis was taken. can.

[Body motion detection by optical camera]
In addition, if the user does not notice an action that the user does not want to shoot, the photographed serially photographed images cannot be used, but the photographing is continued until the end. In view of the problem that if the user notices an action that the user does not want to shoot in the preview after completing the shooting, the shooting time and the preview time will be wasted. An optical camera 43 (see FIG. 11) is installed at a site where it is possible to photograph the subject S, and whether or not the subject S is moving is determined based on the photographed optical image Io. can be

Image processing of the captured image may determine whether there is motion for the entire captured image. Alternatively, the subject S portion may be extracted by image processing, and determination may be made based on the movement of the subject S alone. Alternatively, a specific region determined for each imaging technique may be extracted and determined based on the movement of the specific region.
Determination of movement in a photographed image may be made based on the difference from the first photographed image, or may be judged between adjacent images. Also, both of them may be used for the determination.
Then, depending on the determination result, a warning is given to the user, or a response such as stopping the photographing is made.

In this way, it is possible to detect whether or not the subject S is making an undesired action.
In addition, when an action that is not desired to be photographed is detected, the user is warned to that effect or the photographing is stopped, thereby preventing the subject S from being unnecessarily exposed to radiation.
Note that the optical camera 43 may be arranged so as to image the subject S not only from the front but also from the side.

[Detection by sensor]
There is a problem that an error occurs in the SID or the like due to unintentional movement of the radiation irradiation unit 103 during serial imaging.
In view of such problems, for example, as shown in FIGS. It may be determined whether or not there is a positional change of the radiation irradiation unit 103 inside.
As the sensor Se1, for example, an acceleration sensor, a gyro sensor, a geomagnetic sensor, a strain gauge sensor, or the like can be used.
The determination of the positional change is made by the control section of the console 4, for example.

Further, the determination of the positional fluctuation is made by determining whether or not the output value of the sensor Se1, the average value of the output values obtained in a certain period of time, the cumulative value of the output values obtained in a certain period of time, or the like exceeds a predetermined threshold value. It can be judged by
The threshold value may be set and changed by the user based on the image accuracy desired to be obtained in photographing.
Further, the output value, the average value, or the cumulative value may be filtered using a low-pass filter or the like for stable processing, and judgment may be made based on the filtered data.
When it is determined that the output value, average value, or accumulated value has exceeded the threshold value, a warning is given to the user, or a response such as stopping the photographing is made.

In this way, the positional variation of the radiation irradiation unit 103 is measured, and when the positional variation exceeds a threshold value (permissible value), the user is warned or the imaging is stopped. is continued to prevent the subject S from being wastefully exposed to radiation.
In addition, it is not possible to determine whether the subject S has moved or the radiation irradiation unit 103 has moved from the captured serially captured images. It becomes easier to take measures to prevent the camera from moving during the next shooting.

Note that the positional fluctuation data from the sensor output may be stored in association with the serial imaging data so that the relationship between the positional fluctuation of the radiation irradiation unit 103 and the image can be checked later.
In this way, it is possible to confirm whether or not the movement of the radiation irradiation unit 103 has an effect by comparing it with the movement of the radiation source 34 at the time of diagnosis using an image preview after imaging or a dynamic image.

In addition, it is possible to determine whether or not the position of the radiation irradiation unit 103 has changed and to store the positional change data not only during the serial imaging, but also during the period after the user finishes positioning and before the serial imaging starts. can be
In this way, it is of course possible to detect a positional change during serial photography and warn the user or stop photography. Therefore, it is possible to reliably avoid unnecessary imaging and to further prevent the subject S from being exposed to radiation unnecessarily.

In addition, by arranging sensors Se1 at two or more of the main body 101 of the medical vehicle, the arm 102, and the radiation irradiation unit 103, positional changes in the front and rear directions with respect to the movable unit may be detected.
In this way, it is possible to detect in which part from the medical cart main body 101 to the radiation irradiation unit 103 the positional change has occurred from a plurality of sensor information.
In addition, based on the information on which part of the image the position has changed, it is possible to specify the position that should be paid attention to when taking the next image, reducing the possibility that the same position change will occur in the next image. be able to.

[Use of stable support mechanism]
When the radiation irradiation unit 103 attached to the arm 102 emits radiation to perform imaging, there is a problem that the movement of the arm 102 and the radiation irradiation unit 103 disturbs the photographed image. In particular, when serial imaging is performed, the imaging period is long, and the movement of the arm 102 and the radiation irradiation unit 103 causes a large disturbance in the captured image.
In view of such problems, for example, as shown in FIG. 70, the system main body 100A may be provided with a stabilizing support mechanism 104 for changing the position of the center of gravity.
As the stable support mechanism 104, for example, a stabilizer or the like can be used.
The attachment position of the stable support mechanism 104 can be set to the arm 102 or the radiation irradiation unit 103, for example.
In this way, the stable support mechanism 104 that changes the position of the center of gravity suppresses the movement of the radiation irradiation unit 103 and the arm 102, and it is possible to obtain a photographed image with little disturbance.

[Determination by irradiation area]
Unintentional movement of the radiation source 34 during serial imaging causes an error in the SID or the like, resulting in a change in the effective image area. As shown in (b), there is a problem that part of the imaging device 100B is outside the radiation irradiation area.
In view of such problems, it is determined whether or not there is an area not irradiated with radiation from the image area where the radiation does not reach, and if there is an area not irradiated with radiation, the following (1) to (3) At least one countermeasure may be taken.
(1) notify users;
(2) Stop radiation irradiation and stop imaging.
(3) The radiation irradiation unit 103 is moved by the actuator 103b so that the entire image is irradiated with radiation.
In this way, even if the radiation source 34 moves, it is possible to obtain an image in which the entire imaging region is irradiated with radiation.

[Adding markers to panels]
When performing serial imaging, the user desires to image only the movement of the subject S to be imaged (for example, breathing during pulmonary imaging). However, there are cases where the subject S performs an action that is not desired to be imaged (for example, a body movement that moves the body up, down, left, right, back and forth) in addition to the action that is desired to be imaged. In order to prevent continuation of imaging when the subject S is performing an action that the subject S does not want to be imaged, for example, a marker M is attached to the subject S, and the movement of the subject S is controlled by the movement of the marker M. Although the method of detection is adopted, attaching the marker M to the subject S is troublesome.

In view of such a problem, for example, as shown in FIG. 72, a marker M is provided in an imaging device 100B, and the amount of relative movement between the marker M and the outline of the body, bones, etc. is extracted by image processing or the like. You may do so.
In this way, the trouble of attaching the marker M to the subject S can be saved.
Note that the marker M may be formed of a material having a high radiation transmittance. In this way, by viewing only the image of the area through which the marker M is transmitted, the image processing load is reduced.
Alternatively, the marker M may be erased by image processing, as shown in FIG. 73, for example.

[Detection by marker]
Further, as described above, when the marker M is provided on the imaging device 100B, movement of the subject S in the front-rear direction (direction connecting the radiation source and the imaging device 100B) cannot be detected.
In view of such problems, for example, as shown in FIG. Motion may be detected. Movement of the subject S in the front-rear direction can be grasped by focusing on a specific part (for example, the shoulder) of the subject S photographed by the stereo camera 44 and calculating the distance to the specific part.

In addition, as shown in FIG. 74(b), a marker M may be attached to the subject S and the movement thereof may be tracked by a monocular camera. In this way, the relative position of the marker M can be used to detect the amount of body movement in the vertical and horizontal directions, and the reduction ratio of the marker M can be used to detect the amount of body movement in the front-back direction. Moreover, compared with the case of using the stereo camera 44, the cost and the amount of processing can be suppressed.
Further, as shown in FIG. 74(c), the cameras 43 and 44 may be synchronized with the radiation irradiation timing so that only the camera data at the irradiation timing may be analyzed. In this way, the amount of data processing can be reduced.
Alternatively, as shown in FIG. 74(d), a scintillator Sc may be used as a marker M, and camera data may be acquired at the scintillator emission timing (radiation irradiation timing). In this way, the position of the marker M can be easily detected by the camera, and can be detected even in a dark place. In addition, even if the system main body 100A and the camera are not interlocked, the image can be taken.

Moreover, although the configuration using the stereo camera 44 has been described here, the present invention is not limited to the configuration using the stereo camera. That is, it is possible to perform similar detection using an optical camera other than a stereo camera.
Also, a configuration for controlling the magnification of the camera according to the irradiation field of the collimator 35 may be further provided. By linking the irradiation field of the collimator 35 and the photographing area of the camera, the area to be radiographed can be photographed by the camera, eliminating the need to photograph a useless area with the camera. In addition, it is possible to minimize infringement of privacy due to the useless area being photographed by the camera.
On the other hand, the imaging area of the camera may be larger than the radiation irradiation area of the collimator 35 . By making the imaging area of the camera wider than the radiation area, it becomes possible to easily find an object obstructing imaging in the vicinity of the imaging site with the camera.

[Detection by marker (2)]
In addition, in the case where the imaging device 100B is provided with the marker M, in view of the problem that changes in the front-rear direction of the subject S (the direction connecting the radiation source and the imaging device 100B) cannot be detected, the acceleration sensor or the A gyro sensor may be attached to obtain information on the XYZ directions and rotation angle.
In that case, a collimator fixture may be provided so that the specific axis of the sensor always faces the collimator side.
In this way, it is possible to detect not only the movement of the subject S in the vertical and horizontal directions, but also the forward and backward directions and twisting movements.

[Detection by marker (3)]
In serial imaging, there is a demand to prevent the image of the subject S from changing even when the subject S moves in the front-rear direction.
In view of such problems, for example, the imaging method shown in FIGS. M or a scintillator Sc (hereinafter referred to as marker M etc.) is attached, and the forward and backward movement of the marker M in the optical image taken by the cameras 43 and 44 is estimated by estimating the torsion angle by deformation of the marker M etc. Based on the data, the collimator may be moved (the SID, the irradiation angle, and the up/down/left/right adjustment).

When photographing in this way, if the SID is small, as shown in FIG. When the SID is large, as shown in FIG. 75(c), the marker M etc. appear smaller than in the case of FIG. 75(a) photographed with a proper SID.
On the other hand, as shown in FIG. 76(a), for example, when the subject S is rotating left and right with the body axis as the rotation axis, the marker M , etc. appear in an elongated elliptical shape to the left and right. appears as an elongated ellipse.
Therefore, the collimator is moved so that the marker M and the like appearing in the optical image appear in a perfect circle of appropriate size (the circle indicated by the dashed lines in FIGS. 7675(b) and (c)).
Note that the shape of the marker M and the like can be a circle, a square, a plurality of circles, or the like, as shown in FIG. 77, for example.
In this way, the image of the subject S can be kept unchanged even when the subject S moves in the front-rear direction, rotates, or the like.

The term "user" used in the embodiments of the present invention refers to, for example, a radiographer who operates a radiography system and captures a radiographic image, or in some operations, immediately captures a radiographic image. intended for anyone (including the cinematographer) or cinematographer.
It is also intended for radiologists, doctors, and the like who adjust the captured images so that they can be easily checked, check the captured images, and make diagnoses.

100, 200, 300 Radiation imaging system 100A System body (carrying car)
101 Medical Vehicle Main Body 102 Arm 103 Radiation Irradiation Unit 103a Case 103b Actuator 103c Shielding Wall 103d Transmission Means 103e First Transmission/Reception Means 104 Stability Support Mechanism 1 Housing 1a Wheel 2 Imaging Control Unit Communication Unit 3 Radiation Irradiation Device 31 Operation Unit 31a Irradiation Switch 31b Speaker 31c Vibration source 31d Button 32 Radiation control unit 33 High pressure generator 34 Radiation source 35 Collimator 4 Console 41 Display unit 41a Distribution of measured values by pressure sensor 42 Communication unit 42a Wired communication interface 42b Wireless communication interface 43 Optical camera 44 Stereo camera 5 Power supply unit 51 Battery 52 Power supply distribution unit 53 Power supply cable 53a Plug 6 Access point 100B Radiation imaging device 61 Housing 61a Power switch 61b Operation switch 61c Indicator 61d Connector 61e Radiation incident surface 61f Button 61g Communication path 61h Removal unit 62 Control Part 63 Radiation detection part 64 Readout part 65 Communication part 66 Storage part 67, 67A, 67B Third atmospheric pressure sensor 68, 68A Second temperature sensor 69 Bus 7 Receiving means 7A Second transmitting/receiving means 8 Actuator 9 Length measuring means 100C Body motion detection Apparatus 71 Control Unit 72 Communication Unit 73 Storage Unit 74 Bus A1 First rotation axis A2 Second rotation axis Aa Arm axis Ao Optical axis B1 Button B2 Button C Center E Edge F Focus f Fixture G Grid Ga Thin plate g Rod H Holder Io Optical image Ir Radiation image Lc Center line Lo Contour line Lv Vertical line M Marker Ma Hole O Openings P ₁ , P ₂ , P ₃ Part R ₁ allowable region R ₂ Body region R ₃ to R ₉ specific region Rd direct radiation area S subject Sp ₁ inner space Sp ₂ intermediate space Se1 sensor Se2 pressure sensor W window X radiation

Claims (6)

an acquisition means for acquiring a plurality of image data from an imaging means capable of repeatedly generating image data of a subject based on one imaging operation;
site designating means for designating a specific site that is required not to cause body movement different from the specific body movement to be diagnosed, for each image data acquired by the acquisition means;
motion detection means for detecting motion of the specific part designated by the part designation means based on a plurality of image data;
body movement determination means for determining the presence or absence of a body movement different from the specific body movement based on the movement detected by the movement detection means ;
The movement detection means detects the amount of movement, which is the magnitude of movement of the specific part, as a component in a first direction, which is the direction in which the specific body movement is performed, and a component in a second direction different from the first direction. , and detected separately,
The body motion determining means detects when the amount of motion in the first direction detected by the motion detecting means exceeds a first threshold for comparison with the amount of motion in the first direction, or when the motion detecting means Body motion different from the specific body motion when the detected amount of motion in the second direction exceeds a second threshold different from the first threshold for comparison with the amount of motion in the second direction A body movement detection device characterized by determining that there was a 2. The body motion detection device according to claim 1, wherein the first threshold is a threshold based on a preset maximum motion amount of the specific body motion at the specific part. 3. The body motion detection apparatus according to claim 1, wherein the motion detection means detects the motion based on the amount of displacement of a marker attached to the subject. warning means for warning the photographer that body movement affecting diagnosis has occurred when the motion detection means determines that there is body movement;
4. The apparatus according to any one of claims 1 to 3 , further comprising at least one of: an imaging interrupting unit that interrupts generation of radiation by the radiation source when the motion detecting unit determines that there is body motion. body motion detection device. A radiation irradiation apparatus capable of repeatedly irradiating a subject with radiation based on a single imaging operation, and a radiation imaging apparatus capable of repeatedly generating image data of the subject based on a single imaging operation. and a photographing means having
A radiography system comprising the body motion detection device according to any one of claims 1 to 4 . a radiation irradiation device capable of repeatedly irradiating a subject with radiation based on one imaging operation;
a radiation imaging apparatus capable of repeatedly generating radiographic images of a subject based on a single imaging operation;
an imaging means capable of repeatedly imaging the subject to generate image data while the radiation imaging apparatus repeats generation of image data;
A radiography system comprising the body motion detection device according to any one of claims 1 to 4 .

Images