JP2008228914A - Radiographing control device and control method for radiographic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To permit radiographing of a sufficient grade for surgery or diagnoses while restraining an exposure dose of radiation. <P>SOLUTION: The radiographing control device having a radiation source and a detection panel for detecting radiation emitted from the radiation source, operates as a first radiographing mode in which a radiograph is obtained by driving the radiation source to have a first dose of irradiation and a second radiographing mode in which a radiograph is obtained by driving the radiation source to have a second dose of irradiation smaller than the first dose of irradiation. A radiographing control section detects a variation of an image between frames by using an image captured in the first or second radiographing mode and sets the frame rate of the first radiographing mode on the basis of the variation. Here the radiographing control section makes radiographing in the second mode to be carried out with timing based on a fixed frame rate and timing other than the timing of carrying out the first radiographing mode. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radiographic imaging control apparatus and a radiographic imaging control method in a medical X-ray fluoroscopic diagnosis apparatus and the like.

  Conventionally, a radiographic technique for obtaining an image inside an object using radiation such as X-rays is known. In particular, a medical X-ray fluoroscopic diagnosis apparatus has been widely used in a diagnosis method using a digital image from a conventional analog photographed image. For example, by continuously displaying digital images taken by X-ray on a monitor as moving image data or storing them in a memory or hard disk device, the digital images taken by X-ray can be diagnosed or treated. Has been used.

  In such moving image shooting, in order to reduce the amount of X-ray irradiation and the amount of stored data, control is performed such that the moving image frame rate is lower than that of normal shooting or the intensity of the X-ray pulse is weakened. ing. In general, driving conditions such as the moving image frame rate and the X-ray pulse intensity are preset and fixed. These driving conditions are changed by manual operation of the operator.

Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-073490) describes a method in which the frame rate is variable according to ecological movement. Japanese Patent Laid-Open No. 5-192319 discloses that X-ray exposure is controlled in accordance with detection of a subject.
JP 2004-073490 A JP-A-5-192319

  Further, in the configuration in which the frame rate of the moving image is automatically changed according to the movement of the subject and the imaging range according to Patent Documents 1 and 2, it is necessary to detect the timing of the movement of the subject and the change of the image. . For example, for heartbeats, it is possible to detect the movement of a subject by using an event from an external device such as an electrocardiograph. However, it is only possible to detect the steady movement of such a specific part. It will not be possible. In addition, when detecting a motion by analyzing a captured image, the followability to a change in motion slows down when the frame rate is low.

  The present invention has been made in view of the above problems, and an object of the present invention is to enable radiographic imaging with sufficient quality for performing surgery and diagnosis while suppressing the radiation exposure dose.

In order to achieve the above object, a radiographic imaging apparatus according to the present invention comprises the following arrangement. That is,
A radiographic image capturing control device for capturing a radiographic image irradiated from a radiation generating device,
A first imaging mode in which a radiation image for output is captured by controlling the radiation generating apparatus so as to irradiate radiation with a first irradiation amount; and a second irradiation amount that is smaller than the first irradiation amount An imaging control means for controlling imaging in accordance with a second imaging mode for imaging a radiation image for change detection by controlling the radiation generating device so as to irradiate with radiation;
The first and second imaging modes include detection means for detecting a change amount of the radiographic image between frames based on the radiographic image taken by the imaging means.

Moreover, the control method of the radiographic imaging apparatus by this invention for achieving said objective comprises the following structures. That is,
A control method of a radiographic image capturing control device for capturing a radiographic image irradiated from a radiation generating device,
The imaging control means controls the radiation generator so as to irradiate the radiation with the first irradiation amount, the first imaging mode for capturing the radiation image for output, and less than the first irradiation amount. An imaging control step for controlling imaging by a second imaging mode for imaging a radiation image for change detection by controlling the radiation generator to irradiate radiation at a second dose;
In the first and second imaging modes, a detection step of detecting a change amount of the radiographic image between frames based on the radiographic image captured by the imaging unit;
It is characterized by providing.

  ADVANTAGE OF THE INVENTION According to this invention, radiographic moving image imaging | photography of sufficient quality for performing surgery and a diagnosis is possible, suppressing radiation exposure amount. For example, in the X-ray diagnosis, it is possible to obtain a good moving image while reducing the load on the X-ray exposure and the X-ray tube.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following, embodiments will be described by taking an apparatus using X-rays as radiation as an example.

  FIG. 1 is a block diagram illustrating the overall configuration of a radiographic image capturing apparatus according to an embodiment. A radiographic imaging apparatus 100 shown in FIG. 1 includes a sensor unit 101, an X-ray generation apparatus 104, a controller 107 serving as a radiographic imaging control apparatus, and an operation unit 113.

  A sensor unit 101 as a radiation (X-ray) detection panel (imaging means) includes an X-ray sensor 102 and a sensor control unit 103. The X-ray sensor 102 includes a phosphor that generates visible light corresponding to the energy of X-rays, and a photoelectric conversion element that converts visible light into an electrical signal corresponding to the intensity thereof. Digital image data (raw image data) output from the X-ray sensor 102 is sent to the controller 107. The sensor control unit 103 controls driving of the X-ray sensor 102. For example, the sensor control unit 103 drives the X-ray sensor 102 in accordance with a timing signal from the imaging control unit 112 (acquires image data from the X-ray sensor 102). In addition, the sensor control unit 103 sets the output mode (binning readout or the like) of the X-ray sensor 102 based on the setting parameters from the imaging control unit 112.

  A high-speed digital interface such as LVDS is used between the sensor unit 101 and the controller 107 for data transfer (for data transfer between the X-ray sensor 102 and the image processing unit 108). Note that LVDS is an abbreviation for Low Voltage Differential Signaling. Asynchronous serial communication such as UART is used for input / output of parameters and timing signals between the sensor unit 101 and the controller 107 (for signal input / output between the sensor control unit 103 and the imaging control unit 112).

  An X-ray generator 104 as a radiation generator includes an X-ray tube 105 and an X-ray pulse controller 106. The X-ray tube 105 emits pulsed X-rays in response to a drive signal from the X-ray pulse control unit 106. Further, the X-ray pulse control unit 106 drives the X-ray tube 105 with the instructed exposure condition and drive timing in accordance with the timing instruction and setting parameters from the imaging control unit 112. In the present embodiment, radiation is described as X-rays.

  The controller 107 serving as a radiographic image capturing control device includes an image processing unit 108, an encoding unit 109, a display image transmitting unit 110, a change amount detecting unit 111, and an imaging control unit 112. For input / output of parameters between the X-ray generator 104 and the controller 107, asynchronous serial communication or a low-latency network protocol such as CAN (Controller Area Network) can be used. The imaging controller 112 continuously sends timing instructions to the X-ray generator 104 and the sensor unit 101, so that X-ray fluoroscopic images can be continuously captured. For example, 30 frames / second (fps) of moving image data can be generated by generating 30 timing instructions per second. Note that the imaging control unit 112 of the present embodiment has a first imaging mode in which X-ray imaging is performed under an exposure condition for acquiring a normal X-ray image for display, and an exposure amount that is higher than that in the first imaging mode. Imaging can be performed in a plurality of types of imaging modes including a second imaging mode in which X-ray imaging is performed under few exposure conditions.

  The image processing unit 108 receives the digital image data output from the sensor unit 101 and performs predetermined image processing. Examples of the image processing include image quality enhancement processing such as correction depending on the characteristics of the X-ray sensor, noise removal processing, and dynamic range improvement. In addition, the image processing unit 108 performs processing of sending the image-processed data to the change amount detection unit 111 and sending the image data captured in the first shooting mode to the encoding unit 109. The encoding unit 109 performs lossless compression encoding processing on the display image data subjected to image processing, and sends the display image data to the display image transmission unit 110. The controller 107 and the operation unit 113 are network-connected using, for example, Gigabit Ethernet (registered trademark). The display image transmission unit 110 performs packetization of the image data transmitted from the encoding unit 109 and network protocol processing, and transmits data to the operation unit 113. In this way, the image shot in the first shooting mode is used as display image data on the display device 115 or used as storage data in the storage device 117.

  Image data captured in the first or second imaging mode is input to the change amount detection unit 111. The change amount detection unit 111 calculates a change amount (motion amount) between two pieces of continuous image data with respect to continuously taken image data. A known method can be applied to the change amount calculation by the change amount detection unit 111. For example, the amount of change can be obtained by comparing the image data of the current frame with the image data of the previous frame. More specifically, the difference between each image data is simply calculated and the difference amount is obtained as the change amount, the change amount is determined from the ratio of the difference amount to all pixels, or the motion vector For example, the amount of change may be determined from the value. The change amount calculated by the change amount detection unit 111 is sent to the imaging control unit 112.

  The imaging control unit 112 includes a microprocessor and a ROM (read only memory) in which a control program executed by the microprocessor is stored. Furthermore, the imaging control unit 112 includes a RAM (Random Access Memory), an I / O port, and the like that are used as a work area during program execution. The imaging control unit 112 implements various processes by causing the microprocessor to execute a control program stored in the ROM. For example, the imaging control unit 112 determines the imaging interval (frame rate) of the display image and the X-ray pulse intensity in each imaging frame in accordance with the change amount calculated by the change amount detection unit 111. Then, an imaging timing instruction, a drive parameter instruction, and the like are sent to the sensor unit 101 and the X-ray generator 104. Note that the imaging control unit 112 can send parameter instructions to the sensor unit 101 and the X-ray generator 104 in accordance with imaging conditions based on instructions from the operation unit 113. Details of the shooting control process of the shooting control unit 112 will be described later with reference to the flowchart of FIG.

  The operation unit 113 includes a display system 114, a display device 115, a console 116, and a storage device 117, and includes a PC (personal computer) and peripheral devices connected thereto.

  The display system 114 is realized by a PC main body and application software operating on the PC main body. The display system 114 receives the image data transmitted from the display image transmission unit 110 of the controller 107 through the network, and performs a decoding process on the image data. Then, the decoded image data is output to the display device 115 for visual display. Alternatively, the display system 114 stores the decoded image data received from the display image transmission unit 110 in the storage device 117. In the above description, the display system 114 stores the decoded image data in the storage device 117. However, the image data before decoding may be stored. Accumulating image data before decoding is advantageous in terms of storage capacity and will be more general. Further, in response to a user operation from the console 116, the display system 114 performs various instructions to the controller 107 such as start / stop of shooting and setting of a shooting mode through the network.

  Next, in FIG. 2, the control of software executed by the microprocessor built in the imaging control unit 112 of the controller 107 which is the radiographic imaging control apparatus shown in FIG. 1 will be described using a flowchart. .

  First, in step S <b> 201, the imaging control unit 112 acquires various imaging conditions such as a frame rate (30 fps in this case) of an image for display designated through the operation unit 113 and an X-ray pulse amount from the display system 114. To do. The frame rate of shooting in the first shooting mode is equivalent to the frame rate of the display image, and this frame rate is set as the initial value of the frame rate of shooting in the first shooting mode. Next, in step S202, the imaging control unit 112 performs setting of the X-ray irradiation amount (X-ray pulse amount) in the first imaging mode, setting of the sensor readout mode, and the like according to the acquired imaging conditions. This setting is executed when the imaging control unit 112 issues a setting parameter command to the sensor control unit 103 and the X-ray pulse control unit 106. Next, in step S203, the process waits until a shooting start instruction is issued from the operation unit 113. The display image refers to an output image output to the operation unit 113 and is displayed on the display screen of the display device 115. The display image is stored in the storage device 117.

  When the shooting control unit 112 detects a shooting start instruction, in step S204a, based on the currently set display image frame rate, it is determined whether it is the timing to execute the first shooting mode (whether it is the display image shooting timing). to decide. If it is time to execute the first shooting mode, the process proceeds to step S205. In step S205, the imaging control unit 112 instructs the sensor control unit 103 and the X-ray pulse control unit 106 to perform a first imaging mode, that is, an imaging timing instruction command using normal intensity X-rays (hereinafter referred to as a first imaging command). Issue). Image data acquired by the sensor unit 101 in response to the first shooting command is transmitted to the image processing unit 108. Then, the imaging control unit 112 controls the image processing unit 108 so as to send the image processed image data to the encoding unit 109 and the change amount detection unit 111. Thus, the image data obtained in the first shooting mode is supplied to the encoding unit 109 and the change amount detection unit 111. Subsequently, in step S207, the imaging control unit 112 encodes the image processing unit 108 so as to transmit image data for one frame captured by the first imaging command issued in step S205 to the display system 114. Unit 109 and display image transmission unit 110 are controlled.

  On the other hand, if it is not time to execute the first shooting mode in step S204a, the shooting control unit 112 determines whether it is time to execute the second shooting mode in step S204b. The shooting execution timing in the second shooting mode is set, for example, at a timing of a cycle of 30 fps, and is fixed without depending on the amount of change. The shooting execution timing in the second shooting mode is preferably equal to or higher than the frame rate of the display image set in step S201. If it is not time to execute the second shooting mode, the process returns to step S204a and waits for the execution timing of either the first or second shooting mode. As is apparent from the flowchart of FIG. 2, when the shooting execution timing in the first shooting mode overlaps with the shooting execution timing in the second shooting mode, the first shooting mode has priority.

  If it is determined in step S204b that the shooting execution timing is in the second shooting mode, the process proceeds to step S206. In step S <b> 206, the imaging control unit 112 issues a second imaging mode (hereinafter referred to as a second imaging instruction command) to the sensor control unit 103 and the X-ray pulse control unit 106. The second imaging instruction command is a command for instructing an execution timing of imaging with an X-ray irradiation amount having a weaker intensity than in the first imaging mode. Image data acquired from the sensor unit 101 in response to the second imaging instruction command is transmitted to the image processing unit 108. Then, the shooting control unit 112 controls the image processing unit 108 to send only the change amount detection unit 111 with the image data acquired in accordance with the second shooting instruction command and subjected to image processing. Thus, the image data obtained in the second imaging mode is supplied to the change amount detection unit 111.

  The change amount detection unit 111 detects the change amount from the image data of the current frame and the image data of the previous frame. The image data of the current frame is image data of a radiographic image newly captured in the first or second imaging mode, and the image data of the previous frame is the first or second imaging mode immediately before the current frame. It is the image data photographed at. In step S <b> 208, the imaging control unit 112 reads the change amount calculated as described above from the change amount detection unit 111. It is preferable that the change amount detection unit 111 compares image data of radiographic images captured in the same imaging mode. When calculating the amount of change based on the image data of the radiographic image captured in different imaging modes, the difference in the radiation dose at the time of imaging is taken into consideration. That is, the change amount detection unit 111 calculates the change amount after amplifying the image data of the radiographic image captured in the second imaging mode by the difference in the radiation dose.

  In step S209, the imaging control unit 112 resets the display image frame rate based on the change amount read in step S208. The shooting control unit 112 updates the frame rate of the first shooting mode in response to the resetting of the display image frame rate, and the shooting in the first shooting mode thereafter is updated to the updated frame rate (updated display image (Frame rate). In the present embodiment, the imaging control unit 112 reduces the display image frame rate when the amount of change detected in step S208 is smaller than the amount of change detected immediately before, and conversely than the amount of change immediately before. If the number of images increases, the display image frame rate is increased. Alternatively, a plurality of threshold values related to a plurality of display image frame rates are prepared, and one of the plurality of display image frame rates is selected and set by comparing these threshold values with the amount of change. Also good. In any case, the smaller the change amount, the smaller the display image frame rate is set. Even if the frame rate of the display image changes, the X-ray imaging timing in the second imaging mode shown in step S206 is constant and is fixed at 30 fps.

  The processes from step S204a to S209 described above indicate the shooting process for one frame of an image. By repeating this series of processes, moving image shooting as a continuous image can be performed. In step S210, the imaging control unit 112 checks whether or not there has been an imaging end instruction from the operation unit 113. If there is an imaging end instruction, the process ends, and if not, the process returns to step S204a.

  As described above, the shooting control unit 112 executes shooting in the first shooting mode at the timing based on the set display image frame rate. Then, the shooting in the second shooting mode is executed at a timing based on the fixed frame rate other than the timing at which the first shooting mode is executed. As a result, while the subject moves little, the display image is framed at a low frame rate, and the change frequency detection frequency is maintained by using the image data captured in the first and second imaging modes. be able to.

  FIG. 3 is a diagram illustrating a correlation between a captured image, an X-ray pulse intensity, and a change amount over time according to the present embodiment. Note that the X-ray pulse intensity and the X-ray irradiation dose are proportional.

  In FIG. 3, reference numeral 301 denotes a series of frame images, and a frame masked with diagonal lines as shown in 302 denotes a display frame obtained in the first photographing mode. On the other hand, a white frame as indicated by 303 is a frame obtained in the second shooting mode, and indicates a frame for detecting a change amount. Assume that the shooting interval of each frame is about 33 ms, that is, the initial display image frame rate and the shooting frame rate in the second shooting mode are 30 fps. In the present embodiment, the frame rates of shooting in the first and second shooting modes are synchronized, and the frame rate (display image frame rate) of shooting in the first shooting mode is 30 fps / n (n = 1). , 2, 3, 4).

  Reference numeral 304 represents the exposure timing and intensity of the X-ray pulse, and the long arrow 305 indicates the exposure of a strong X-ray pulse for display image capturing in the first imaging mode. A short arrow 306 indicates exposure of a weak X-ray pulse for change amount detection image capturing in the second imaging mode. Reference numeral 307 represents a change amount between images of adjacent frames detected by the change amount detection unit 111, and a curve indicated by 308 represents a change of the change amount with time.

  As shown in FIG. 3, shooting in the first shooting mode is initially performed at a frame rate of 30 fps, but as the amount of change decreases, the frame rate decreases (15 fps → 10 fps → 7.5 fps). In the example of FIG. 3, the image display frame rate is controlled by thinning out strong X-ray pulses 305 for photographing a display image. On the other hand, imaging in the second imaging mode (imaging by exposure of weak X-ray pulses for obtaining a change amount detection image) is performed at a fixed frame rate (30 fps). For this reason, even if the amount of change suddenly increases in the second half, the frequency of change amount detection can be maintained, and display image capture at a high frame rate can be quickly switched according to the amount of change.

  Next, detection of a change amount between images of adjacent frames by the change amount detection unit 111b will be described. FIG. 4 and FIG. 5 are diagrams schematically showing changes in the photographed image accompanying the movement of the subject.

  In FIG. 4, 401 indicates a captured image of a certain frame (Xn), and 403 indicates a captured image of the next frame (Xn + 1). The captured image 401 shows the contracted state of the heart 402 as a subject, and the captured image 403 of the next frame shows a state of transition from the contracted state 404 to the expanded state 405. The amount of change in this case is represented by an arrow in the figure. Since the heart operates relatively fast, the movement speed increases.

  In FIG. 5, 501 represents a captured image of a certain frame (Xn), and 503 represents a captured image of the next frame (Xn + 1). The captured image 501 shows the contracted state of the lung 502 as a subject, and the captured image 503 of the next frame shows a state of transition from the contracted state 504 to the expanded state 505. Since the lung operates relatively slowly, the arrow indicating the amount of change is also short, indicating that the amount of change is small. However, since the ratio of the photographic subject to the entire screen is large, the area where the image moves is widened.

The value of the change amount from the change amount detection unit 111 is a large value as the change amount even when the movement speed is large like the heart shown in FIG. 4 or when the region with movement like the lung shown in FIG. 5 is wide. Is calculated. As described above, the change amount detection unit 111 is
(1) The magnitude of the movement of the subject (for example, the amount of motion vector of the image between frames),
(2) The size of the change area in the image between frames (for example, the difference between the images between frames) is detected as the change amount.

  In general, as a characteristic of the X-ray sensor 102, a charge is accumulated due to sensing by natural light even in a time zone when X-ray irradiation is not performed. If the image is read out from the sensor after X-ray pulse irradiation while this is left unattended, the charges accumulated before that are added as a noise component and read out, so that a normal image cannot be obtained. For this measure, in radiographic imaging, a so-called dark image correction process is generally performed in which data (dark image) obtained by reading out charges accumulated during the standing time is subtracted from data read at the timing of X-ray irradiation. Is done. FIG. 6 is a diagram showing the X-ray pulse and the timing for reading image data from the sensor when dark image correction processing is performed.

  In FIG. 6, reference numeral 601 denotes an X-ray pulse generation timing, 602 denotes dark image data readout, and 603 denotes image data readout at the X-ray irradiation timing. As shown in FIG. 6, the captured image data (X1) is a value obtained by subtracting the dark image data (read data (y1) at 602) immediately before the read data (x1) at 603.

  In this embodiment, the dark image correction process is performed in both the first and second shooting modes. However, in the reading of the change amount detection image data in the second shooting mode, a dark image is read. The correction process may not be performed. Note that switching whether to perform dark image correction processing is performed in response to a shooting timing instruction (first shooting command, second shooting command) from the shooting control unit 112 to the sensor control unit 103, for example. What is necessary is just to make it the control part 103 perform. However, since the dark image correction processing may affect the amount of change in the image, the amount of change detected by the change amount detection unit 111 is performed by images of successive frames shot in the same shooting mode. It is desirable to do. That is, it is preferable not to detect the amount of change when the shooting mode is switched.

  In the imaging in the second imaging mode, binning readout may be performed as the readout mode of the X-ray sensor 102. Binning readout is a mode in which a plurality of pixels are added and read out as a unit, and is characterized in that the total number of readout pixels is reduced but readout can be performed with high sensitivity. Note that whether to perform binning readout is switched by the sensor control unit 103 in response to a shooting timing instruction (first shooting command, second shooting command) from the shooting control unit 112 to the sensor control unit 103. Done. However, since binning reading may affect the amount of change in the image, the change amount detection by the change amount detection unit 111 should be performed by images of consecutive frames taken in the same shooting mode. Is desirable. That is, it is preferable not to detect the amount of change when the shooting mode is switched.

As described above, according to the above-described embodiment, the frame rate of shooting in the first shooting mode is automatically switched according to the change of the image, so that switching of the frame rate following the movement of the subject can be realized. As a result, when the amount of movement of the subject is small, imaging with a reduced frame rate is executed, so that the radiation exposure amount can be suppressed. Furthermore, even if the frame rate of imaging in the first imaging mode is reduced, imaging in the second imaging mode with a low radiation dose is performed at a fixed frame rate, and the amount of change based on the captured image data Is detected. For this reason, the sensitivity with respect to the change of an image can be maintained. As described above, according to the embodiment,
1. Manual adjustment can follow changes in motion sufficiently,
2. Even when motion detection based on image analysis is used, the effect of preventing deterioration in immediacy of motion detection can be obtained at a low frame rate.

  In addition to the above-described embodiments, the object of the present invention can be achieved even in a shooting mode in which the change of the frame rate of the display image is performed manually in the operation unit 113.

Specifically, first, the controller 107 acquires information on the frame rate of the display image specified by the user in the operation unit 113.
The shooting control unit 112 executes shooting in the first shooting mode at the timing of the frame rate of the acquired display image. In addition, when the frame rate of the acquired display image is equal to or less than a certain threshold, the shooting control unit 112 executes shooting of the change detection image in the second shooting mode at a predetermined frame rate.

  And the radiographic image image | photographed by the 1st, 2nd imaging | photography mode is analyzed. When the calculated change amount is equal to or greater than the predetermined change amount, the operation unit 113 is notified to display warning information indicating that a motion has been detected on the display screen of the display device 115. By confirming this notification, the user can perform an operation to increase the frame rate of the display image.

  Although the embodiment has been described in detail above, the present invention can take an embodiment as a system, apparatus, method, program, storage medium, or the like. Specifically, the present invention may be applied to a system composed of a plurality of devices, or may be applied to an apparatus composed of a single device.

  In the present invention, the functions of the above-described embodiments are achieved by supplying a software program directly or remotely to a system or apparatus, and the computer of the system or apparatus reads and executes the supplied program code. Including the case. In this case, the supplied program is a program corresponding to the flowchart shown in the drawing in the embodiment.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, or the like.

  Examples of the recording medium for supplying the program include the following. For example, floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD- R).

  As another program supply method, a client computer browser is used to connect to a homepage on the Internet, and the computer program of the present invention is downloaded from the homepage to a recording medium such as a hard disk. In this case, the downloaded program may be a compressed file including an automatic installation function. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  Further, the program of the present invention may be encrypted, stored in a storage medium such as a CD-ROM, and distributed to users. In this case, a user who has cleared a predetermined condition is allowed to download key information for decryption from a homepage via the Internet, execute an encrypted program using the key information, and install the program on the computer. You can also.

  In addition to the functions of the above-described embodiments being realized by the computer executing the read program, the embodiment of the embodiment is implemented in cooperation with the OS running on the computer based on the instructions of the program. A function may be realized. In this case, the OS or the like performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

  Furthermore, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, so that part or all of the functions of the above-described embodiments are realized. May be. In this case, after a program is written in the function expansion board or function expansion unit, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program.

It is a block diagram showing the whole X-ray fluoroscopic diagnostic apparatus structure by embodiment. 6 is a flowchart illustrating software control executed by the imaging control unit 112 according to the embodiment. It is a figure showing the correlation in the time passage of the picked-up image, X-ray pulse intensity, and variation | change_quantity by embodiment. It is a figure showing the picked-up image with the motion of a to-be-photographed object by embodiment. It is a figure showing the picked-up image with the motion of a to-be-photographed object by embodiment. It is a figure showing the X-ray pulse and image data read-out timing from a sensor in the case of performing dark image correction processing by embodiment.

Claims (10)

A radiographic image capturing control device for capturing a radiographic image irradiated from a radiation generating device,
A first imaging mode in which a radiation image for output is captured by controlling the radiation generating apparatus so as to irradiate radiation with a first irradiation amount; and a second irradiation amount that is smaller than the first irradiation amount An imaging control means for controlling imaging in accordance with a second imaging mode for capturing a radiation image for change detection by controlling the radiation generating device to irradiate with radiation
A radiographic imaging control apparatus comprising: a detecting unit that detects a change amount of a radiographic image between frames based on a radiographic image captured by the imaging unit in the first and second imaging modes.   The radiographic imaging control apparatus according to claim 1, wherein the imaging control unit sets a frame rate in the first imaging mode based on an amount of change detected by the detection unit.   The radiographic image capturing control apparatus according to claim 1, wherein the radiographic image acquired by imaging in the first imaging mode is an image to be displayed on a display unit.   The radiographic image capturing control apparatus according to claim 1, wherein the radiographic image acquired by the imaging in the first imaging mode is an image to be accumulated in an accumulating unit.   The imaging control unit is configured to select and set one of the plurality of frame rates by comparing the amount of change detected by the detection unit with a plurality of threshold values related to a plurality of frame rates, The radiographic imaging control apparatus according to claim 2, wherein a smaller frame rate is set as the change amount is smaller as a frame rate in the first imaging mode.   The photographing control unit causes the image processing unit to execute dark image correction processing when performing shooting in the first shooting mode, and executes dark image correction processing to the image processing unit when performing shooting in the second shooting mode. The radiographic image capturing control apparatus according to claim 1, wherein the radiographic image capturing control apparatus is not used.   The photographing control means reads the value of each pixel from the detection panel in photographing in the first photographing mode, and adds the values of a plurality of images on the detection panel of the photographing means in photographing in the second photographing mode. The radiographic image capturing control apparatus according to claim 1, wherein the radiographic image capturing control apparatus reads the data as a unit.   2. The radiation according to claim 1, wherein when the amount of change detected by the detection unit is greater than or equal to a predetermined amount of change, the imaging control unit notifies the display unit to give warning information. Image shooting control device. A control method of a radiographic image capturing control device for capturing a radiographic image irradiated from a radiation generating device,
The imaging control means controls the radiation generator so as to irradiate the radiation with the first irradiation amount, the first imaging mode for capturing the radiation image for output, and less than the first irradiation amount. An imaging control step for controlling imaging by a second imaging mode for imaging a radiation image for change detection by controlling the radiation generator to irradiate radiation at a second dose;
In the first and second imaging modes, there is provided a detection step of detecting a change amount of the radiographic image between frames based on the radiographic image captured by the imaging means. Method.   A computer-readable storage medium storing a control program for causing a computer to execute the control method according to claim 9.

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