JP2012200398A - Photographing portion holding device, x-ray diagnostic apparatus, and method for generating x-ray diagnostic image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographing portion holding device, an X-ray diagnostic apparatus, and a method for generating an X-ray diagnostic image, allowing subtraction processing on a moving radiographic object which has been impossible heretofore.SOLUTION: This photographing portion holding device includes: a first fixing implement 53 fixing a first portion M1 of a subject M; a second fixing implement 54 fixing a second portion M3 of the subject M sandwiching a joint portion M2 that is a photographing target together with the first portion M1; a damper 55 connected with the second fixing implement 54; a detection device 56 detecting the position of the second portion M3 when making the joint portion M2 perform bend motion by moving the second portion M3; and an interface 57 transmitting information related to the position of the second portion M3 detected by the detection device 56 to the X-ray diagnostic apparatus 1.

Description

  Embodiments described herein relate generally to an imaging region holder, an X-ray diagnostic apparatus, and an X-ray diagnostic image generation method.

  2. Description of the Related Art In recent years, medical image diagnostic apparatuses that collect information inside a subject and generate a medical image by imaging the inside of the subject based on the collected information have been used. An example of the medical image diagnostic apparatus is an X-ray diagnostic apparatus. The generated medical image is displayed on, for example, a display unit of an X-ray diagnostic apparatus or a medical image display apparatus connected to a network.

  In generating a medical image, in addition to generating an image to be displayed as it is based on acquired image information, for example, a subtraction process may be applied to perform a processing process. This “subtraction processing” is performed by performing imaging twice before and after the injection of contrast medium to the region to be imaged, and subtracting (subtraction) processing a portion that does not change before and after the injection of contrast medium such as bone, This is a processing method in which the shadow is removed and the object to be photographed is clearly displayed (see Patent Document 1 below).

Japanese Patent Laid-Open No. 2005-80285

  However, the invention disclosed in Patent Document 1 does not give consideration to the following points.

  For example, in the shaping region, joint cavity imaging is performed in which a contrast medium is injected into the joints of the extremities and the soft tissue is observed. However, the structure of the shoulder and knee joints is complicated, and positioning for photographing at an angle that does not obstruct the bone is difficult.

  That is, in order to perform the subtraction process, it is necessary to perform imaging in a state in which a part to be imaged that is a subject does not move. This is because if the subject moves, the images before and after the contrast medium injection necessary for the subtraction process are shifted, and the subtraction (subtraction) process cannot be performed appropriately.

  Therefore, when observing (inspecting) a soft tissue, at present, there are many imaging with a cassette that is easy to handle, and there are few inspections with a fluoroscopic image capable of the above-described subtraction processing.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an imaging region holder, an X-ray diagnostic apparatus, and an X-ray diagnostic apparatus that can perform subtraction processing on a moving subject that has been impossible in the past. An object of the present invention is to provide a method for generating an X-ray diagnostic image.

According to a first aspect of the present invention, there is provided an imaging region holder, wherein the first fixture that fixes the first part of the subject and the subject that sandwiches the joint part to be imaged with the first part. A second fixture for fixing the second portion, a shock absorber to which the second fixture is connected, and a second portion when the joint portion is bent by moving the second portion. A detection device that detects a position, and an interface that transmits information related to the position of the second part detected by the detection device to the X-ray diagnostic apparatus.

  According to a second aspect of the present invention, in the imaging region holder, a mounting bracket that is attached to one side in the longitudinal direction of the bed of the X-ray diagnostic apparatus, and one end of the mounting bracket is fixed to the top of the top plate in the vertical direction. A column that stands upright, a first fixture that is attached to the other end of the column and fixes the first part of the subject, and a subject that sandwiches the joint part to be imaged with the first part A second fixing tool for fixing the second part, a second fixing tool connected to one end thereof, a shock absorber fixed to the column at the other end, and a joint part by moving the second part. A detection device that detects the position of the second part when the bending operation is performed, and an interface that transmits information about the position of the second part detected by the detection device to the X-ray diagnostic apparatus.

  According to a fifth aspect of the present invention, in an X-ray diagnostic apparatus including an imaging system having an X-ray generation unit and an X-ray detection unit, an image is generated and stored based on image information captured by the imaging system. An image calculation / storage unit, a display unit for displaying an image generated by the image calculation / storage unit, an imaging system, an image calculation / storage unit, a system control unit for controlling the display unit, The first fixing tool for fixing one part, the second fixing tool for fixing the second part of the subject sandwiching the joint part to be imaged with the first part, and the second fixing tool are connected. , A detection device for detecting the position of the second part when the joint part is bent by moving the second part, and information on the position of the second part detected by the detection device An imaging region holder comprising an interface for transmitting the image to the X-ray diagnostic apparatus, In addition, the image calculation / storage unit stores the image information and the information related to the position of the second part when the joint part to be imaged transmitted from the imaging part holder is bent, and stores the information. A subtraction process is performed using a plurality of pieces of image information having the same information regarding the position of the two parts.

  According to a seventh aspect of the present invention, in the X-ray diagnostic image generation method, the first part and the second part sandwiching the joint part to be imaged of the subject are respectively set to the first part of the imaging part holder. A step of fixing to the fixing tool or the second fixing tool, a step of setting conditions for imaging the joint part using the X-ray diagnostic apparatus, and an imaging part holding tool at the time of imaging when imaging the joint part A first imaging step for storing information related to the position of the image in association with image information acquired by imaging, a step of injecting a contrast medium into the joint region, and an imaging region holder at the time of imaging during imaging of the joint region A second imaging step of storing information relating to the position of the image in association with image information acquired by imaging, and of the image information acquired in the first imaging step and the second imaging step, Using a plurality of image information data is the same on the position of the tool, and a step of performing a subtraction process.

1 is an overall view showing an overall configuration of an X-ray diagnostic apparatus including an imaging region holder in an embodiment of the present invention. It is a block diagram which shows the structure of the X-ray diagnostic apparatus in the 1st Embodiment of this invention. It is a general view which shows the structure of the imaging | photography site | part holder in embodiment of this invention. It is a flowchart which shows the flow of the production | generation of the X-ray diagnostic image in embodiment of this invention. It is a flowchart which shows the flow of the production | generation of the X-ray diagnostic image in embodiment of this invention. It is a block diagram which shows the structure of the X-ray diagnostic apparatus in the 2nd Embodiment of this invention. It is a flowchart which shows the flow of imaging | photography of the X-ray diagnostic image in the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is an overall view showing an overall configuration of an X-ray diagnostic apparatus 1 including an imaging region holder 50 according to an embodiment of the present invention. The X-ray diagnostic apparatus 1 includes an imaging system S including an X-ray generation unit 2 and an X-ray detection unit 3, an image calculation / storage unit 4, a display unit 5, an imaging system S, and an image calculation / storage unit. 4 and a system control unit 6 that controls the display unit 5.

  The X-ray diagnostic apparatus 1 further includes a mechanism unit 7 that drives a bed B on which the subject M lies down during imaging, and a mechanism control unit 8 that controls the mechanism unit 7 in response to a command from the system control unit 6. . At the time of imaging, for example, an imaging instruction is transmitted to the system control unit 6 via the operation unit 9 operated by an engineer who takes an X-ray diagnostic image, and the system control unit 6 follows the X-ray diagnosis described above according to the instruction. Each part of the apparatus 1 is controlled.

  The X-ray diagnostic apparatus 1 is connected to an imaging region holder 50 that prohibits the joint portion from moving in a direction other than a specific direction when imaging the joint portion of the subject M, for example, the knee.

  FIG. 2 is a block diagram showing the configuration of the X-ray diagnostic apparatus 1A according to the first embodiment of the present invention. The X-ray generation unit 2 includes an X-ray tube 2a that irradiates the subject M with X-rays, and an X-ray diaphragm that forms an X-ray weight (cone beam) with respect to the X-rays irradiated from the X-ray tube 2a. 2b. The X-ray tube 2a is a vacuum tube that generates X-rays. Electrons emitted from a cathode (filament) are accelerated by a high voltage supplied from the high-voltage generator 10 to collide with a tungsten anode to generate X-rays. Let The X-ray diaphragm 2b is located between the X-ray tube 2a and the subject M, and has a function of narrowing the X-ray beam irradiated from the X-ray tube 2a to an irradiation range of a predetermined size in the X-ray detector 3. doing.

  Although the X-ray detection unit 3 can be configured in various ways, in the X-ray diagnostic apparatus 1 according to the embodiment of the present invention, the detector is provided below the top plate B1 of the bed B. A planar detector is employed. The flat detector 3a has a plurality of detection elements, and detects X-rays transmitted through the subject M by the plurality of detection elements. The detected X-ray is converted into an electric signal using a converter (not shown) and transmitted to the image calculation / storage unit 4 described later. The gate driver 3b drives the detection element of the flat detector 3a based on a command from the system control unit 6.

  The image calculation / storage unit 4 includes an image information storage unit 4a and an image calculation unit 4b. The image information obtained by converting the X-rays irradiated to the subject M and transmitted through the subject M and detected by the X-ray detection unit 3 is temporarily stored in the image information storage unit 4a. In the embodiment of the present invention, as will be described later, the image information stored in the image information storage unit 4a is combined with information on the position of the second fixture of the imaging region holder 50 (hereinafter, this Such position information is expressed as “affected part position information”).

  The image calculation unit 4b generates a medical image based on the image information of the subject M stored in the image information storage unit 4a. In addition, a subtraction process is performed using two images at the same position using the affected part position information as a key to generate a fluoroscopic image. The generated fluoroscopic image is transmitted and stored in the image information storage unit 4a.

The display unit 5 displays an image (perspective image) stored in the image information storage unit 4 a of the image calculation / storage unit 4. In addition to the image, for example, an input screen for determining shooting conditions is also displayed.

The system control unit 6 includes a CPU (Central Processing Unit) (not shown) and the like. Based on conditions or the like input or set by the operator using the operation unit 9, the imaging system S, image calculation / Control of each unit constituting the X-ray diagnostic apparatus 1A such as the storage unit 4, the display unit 5, and the mechanism control unit 8 and control of the entire system are performed in an integrated manner.

  The mechanism control unit 8 controls each drive part (mechanism unit 7) constituting the X-ray diagnostic apparatus 1 based on a command from the system control unit 6. In the block diagram shown in FIG. 2, only the bed moving mechanism 7 a that drives the bed B is described in the mechanism unit 7, but other than the movable unit of the X-ray diagnostic apparatus 1 </ b> A such as an arm, the mechanism unit 7. The mechanism control unit 8 controls the above. For example, the bed moving mechanism 7a moves the top plate B1 of the bed B in the vertical direction in order to determine the positions of the subject M, the X-ray generation unit 2, and the X-ray detection unit 3 when imaging the subject M.

  The operation unit 9 includes an input device such as a keyboard, a joystick, and a dial for inputting various operations by an operator (for example, an examination engineer) of the X-ray diagnostic apparatus 1A, various switches, and the like. The operator operates the operation unit 9 to perform information on the subject M, various commands, and optimum X-ray irradiation conditions for the region to be imaged (for example, tube voltage applied to the X-ray tube 2a, tube current, X-ray irradiation). Time etc.). In addition, a setting image of shooting conditions such as the position of the shooting system S is displayed on the display panel (display unit 5).

  FIG. 3 is an overall view showing the structure of the imaging region holder 50 in the embodiment of the present invention. The imaging region holder 50 is used when performing contrast imaging in which a contrast medium is injected into a joint of an extremity such as a knee and a soft tissue is observed. Such an imaging part holder 50 is used because, when performing subtraction processing after imaging, if the part to be imaged is not held in some way during imaging, the part to be imaged moves during imaging, This is because it is necessary to prevent a situation where an appropriate image cannot be taken. The imaging region holder 50 in the embodiment of the present invention is used by being fixed to the bed B (top plate B1) of the X-ray diagnostic apparatus 1A (see FIG. 1).

  The imaging part holder 50 includes a mounting bracket 51 attached to the bed B of the X-ray diagnostic apparatus 1A, a support column 52, a first fixing tool 53 that fixes the first part M1 of the subject M, and an imaging target. The joint part M2 is moved by moving the second part 54, the shock absorber 55, and the second part M3 to fix the second part M3 of the subject M sandwiching the joint part M2 to be the first part M1. Is provided with a detection device 56 for detecting the position of the second part M3 when the bending operation is performed, and an interface 57 for transmitting the part position information to the X-ray diagnostic apparatus 1A.

  In the embodiment of the present invention, a case where a knee portion is an object to be imaged will be described as an example. In FIG. 3, the regions of the first part M1 and the second part M3 with the knee (joint part) M2 which is a part of the leg of the subject M as the center are indicated by two-dot chain lines for convenience of explanation. In addition, in the imaging region holder 50 shown in FIG. That is, the thigh portion fixed to the first fixing tool 53 corresponds to the first part shown in the embodiment of the present invention.

  The second fixing tool 54 fixes a calf, which is a portion extending from the knee of the subject M to the ankle. That is, the part of the calf fixed to the 2nd fixing tool 54 corresponds to the 2nd site | part shown in embodiment of this invention. The knee that is the imaging target located between the first part (thigh) and the second part (calf) corresponds to the joint part M2.

The mounting bracket 51 is attached to one side in the longitudinal direction of the bed B of the X-ray diagnostic apparatus 1A as shown in FIG. Specifically, the mounting bracket 51 has a concave cross section, and the top plate B1 is sandwiched between the recesses and the knobs 51a and 51a shown in FIG. ) Is fixed to the top board B1 (bed B). In the X-ray diagnostic apparatus 1 </ b> A of FIG. 1, a state in which the subject M is lying on the top board B <b> 1 and the right foot is fixed to the imaging region holder 50 is shown. The imaging part holder 50 can be attached to an arbitrary place according to the imaging of the part to be imaged.

  As for the method of fixing the imaging part holder 50 to the top plate, not only the knobs 51a and 51a are used, but also the imaging part holding unit 50 is securely fixed to the bed B and the imaging part is held even if the second part moves during imaging. Other methods may be adopted as long as the tool 50 can be fixed so as not to move.

  One end of the column 52 is fixed to the mounting bracket 51 and is erected upward in the vertical direction of the top plate B1. The support column 52 fixes the first fixing tool 53 and the second fixing tool 54 and supports the first part M1 and the second part M3 including the joint part M2 to be imaged.

  The first fixture 53 is attached to the other end of the support column 52 and fixes the first part M1 of the subject M. Specifically, as shown in FIG. 3, the column 52 is fixed to the other end of the column 52, and is attached to the other end of the column 52 via a connection tool 58 a that is also fixed to the first fixture 53. . Since this connecting tool 58a includes a rotating part 58b, the first part M1 fixed to the imaging part holding tool 50 is moved in the direction of arrow A in FIG. 3 along the rotation axis of the rotating part 58b. It is possible to move.

  In this case, the first part M1 and the second part M3 are fixed to the imaging part holder 50, and the joint part M2 to be imaged is photographed by moving the second part M3. At that time, it is necessary to bend the joint part M2 in order to photograph the movement of the joint part M2, and the second part M3 is moved in the direction in which the joint part M2 is bent. At this time, if the first part M1 does not move along with the movement of the second part M3, the position of the joint part M2 to be imaged is shifted, and it is difficult to perform the subtraction process. Because.

  In addition, the rotation axis of the rotating portion 58 b is provided so as to be orthogonal to both the longitudinal direction of the bed B and the support column 52. This is for smooth bending of the joint part M2 due to the movement of the second part M3. Therefore, when the second part M3 moves, the first part M1 (first fixing tool 53) also moves in the direction of the arrow A. Further, by defining the rotation axis of the rotating portion 58b so that the first part M1 does not move in directions other than the direction of arrow A in FIG. 3, the first part M1 is prevented from moving in directions other than the direction of arrow A. This prevents the imaging position of the joint part M2 from shifting.

  A plate-like member 53a for fixing the first part M1 is attached to a region where the first part M1 directly contacts the first fixture 53. However, in the embodiment of the present invention, the plate-like member 53a is constituted by a cushion member for the convenience to the subject M. In the embodiment of the present invention, when the first part M1 is fixed to the first fixing member 53, the fixing member 53b is used. In the first fixing tool 53 shown in FIG. 3, two fixing bands 53b and 53b are provided as fixing members. As shown in FIG. 1, the first fixing tool 53 is used by using the fixing bands 53b and 53b. The first part M1 is fixed to Although the lengths of the fixing bands 53b and 53b shown in FIG. 3 are short, the other fixing bands 53b and 53b for fixing the first part M1 are hidden behind the first part M1. 3 is not shown.

However, various methods can be employed as to how the first part M1 is fixed to the first fixing tool 53. In addition, the fixing bands 53b and 53b have the first portion M1 of 2
Although it is made to fix at the place, the number of the fixing parts is not particularly limited.

  The second fixture 54 fixes the second part M3. The plate-like member 54a on which the second part M3 is placed and the fixing member 54b for fixing the second part M3 are as described in the first fixture 53.

  The joint part M2 to be imaged is not directly held, but both sides (the first part M1 and the second part M3) of the joint part M2 are held and fixed at the time of imaging. This is to prevent 50 from being reflected.

  The second fixture 54 is connected to one end of the shock absorber 55. The other end of the shock absorber 55 is fixed to the support column 52. The shock absorber 55 has a so-called damper structure. When the second portion M3 moves, the rotating portion 58b of the connector 58a rotates, and the direction of the arrow B shown in FIG. Converted to move to.

  The shock absorber 55 is connected to the second fixture 54 and the column 52. The shock absorber 55 expands and contracts in the direction of arrow B according to the movement of moving the second part M3 and bending the joint part M2. When expanding and contracting, since the other end of the shock absorber 55 is fixed to the support column 52, one end side connected to the second fixture 54 moves.

  The shock absorber 55 employs a damper structure, and is connected to and fixed to the second fixing member 54 and the support column 52, whereby the second portion M3 is moved to bend the joint portion M2, and the shock absorber 55 is moved. When contracting, a moderate resistance is added to the second region M3. Thereby, when the subject M moves the second part M3, it is possible to prevent the second part M3 from moving suddenly. Therefore, it is possible to image the joint part M2 that is the imaging target to be bent at an appropriate moving speed.

  Moreover, since it is a damper structure, when moving the 2nd site | part M3 in order to bend the joint site | part M2, the vibration of the 2nd site | part M3 which generate | occur | produces by moving slowly can be absorbed. This leads to prevention of vibration of the joint part M2 that is the subject of photographing, and thus it is possible to acquire a clear photographed image with reduced blurring.

  The second end when the joint part M2 is bent by moving the second part M3 to the outside of the one end side connected to the second fixing member 54 of the shock absorber 55 is provided. A detecting device 56 is provided for detecting the position of this part (hereinafter, this position is referred to as “affected part position”).

  The detecting device 56 includes a geared rack 56a that is fixed to the outside of the shock absorber 55, and a gear 56b that meshes with the rack 56a. As the shock absorber 55 expands and contracts, the rack 56a also moves in the direction of arrow B. Since the gear 56b is fixed to the column 52 and the like, the gear 56b rotates in the arrow C direction as the rack 56a moves in the arrow B direction. In the embodiment of the present invention, the rotation of the gear 56b, for example, an encoder is attached, and the expansion / contraction of the shock absorber 55, that is, the position of the affected part can be measured. Note that the configuration of the detection device 56 is not limited to the above-described configuration, and for example, a laser displacement meter or the like can be used.

  Information (affected part position information) regarding the position (affected part position) of the second part M3 detected by the detection device 56 is transmitted to the X-ray diagnostic apparatus 1A via the interface 57. The affected part position information may be transmitted to the X-ray diagnostic apparatus 1A by any protocol.

  4 and 5 are flowcharts showing a flow of generating an X-ray diagnostic image in the embodiment of the present invention. In particular, in the flowchart of FIG. 4, not only the function of the X-ray diagnostic apparatus 1 </ b> A but also the movement involving human hands, such as fixing the affected part, is shown in order to show the flow of the whole imaging.

  First, the subject M lies down on the bed B (top plate B1). At the same time, the joint part M2 (here, knee, which is also referred to as “affected part” as appropriate) to be imaged is fixed (ST1). Here, “fixing” does not indicate that the joint part M2 to be imaged is directly fixed, but the first part M1 and the second part M3 are only attached to the imaging part holder 50, respectively. It shows fixing to the fixture 53 and the second fixture 54. When fixed, for example, the state shown in FIG. 1 is obtained. Although not shown in the flowchart shown in FIG. 4, the operator uses the operation unit 9 to input shooting conditions and the like in advance.

  Here, the first shooting (first shooting) is performed. In this first imaging, the contrast medium is not injected into the joint part M2. That is, collection (imaging) of mask images is performed. In this first imaging, the second part M3 is moved while the joint part M2 is continuously irradiated with X-rays, the joint part M2 is bent, and the change of the joint part M2 is continuously photographed as a moving image. (ST21 in FIG. 5).

  The flat panel detector 3a that has detected the X-rays transmitted through the subject M converts the detected X-rays into image information, transmits the image information to the image information storage unit 4a, and stores (saves) it in the image information storage unit 4a. . At the same time, from the imaging part holder 50, the affected part position information detected by the detection device 56 as the second part M3 moves is transmitted to the image information storage part 4a (ST22). Therefore, the image information storage unit 4a stores the image information of the mask image transmitted from the X-ray detection unit 3 and the affected part position information corresponding to the image information in association with each other (ST23). As described above, the mask image is taken as a moving image, but since the moving image is an aggregate of a plurality of still images, the position information on the affected area is associated with each still image.

  Here, the image information detected and converted by the X-ray detection unit 3 is associated with the affected part position information from the imaging region holder 50 and stored in the image information storage unit 4a in the first imaging. This is because a subtraction process, which will be described later, is performed using the image information and the image information obtained by the second shooting.

  Next, preparation for performing the second shooting (second shooting) is performed. Specifically, a contrast medium is injected into the joint site M2 (ST3). After injecting the contrast agent, the second imaging is performed at an appropriate time (ST4). The purpose of the second shooting is to acquire a so-called sub image necessary for the subtraction process. In the second imaging, the second part M3 is moved while the joint part M2 is continuously irradiated with X-rays, the joint part M2 is bent, and the change of the joint part M2 is continuously taken as a moving image. To do.

  This sub image is also stored in the image information storage unit 4a. However, as in the case of storing the main image, the affected part position information corresponding to the sub image is associated with the storage (ST41 to ST43 shown in FIG. 5). The main image and the sub image associated with the affected part position information in the two imaging operations described above are stored in the image information storage unit 4a.

Next, subtraction processing is performed in the image calculation unit 4b using these main image and sub image (ST5). As described above, the subtraction process is a processing method for clearly displaying an imaging target by performing a subtraction process using images (main image and sub image) captured before and after contrast agent injection. However, until now, in imaging of the joint part M2, in X-ray imaging, the imaging target is not fixed reliably and an image suitable for processing cannot be acquired, and even if acquired, the same before and after contrast agent injection The image, that is, the difference is only the presence or absence of contrast medium injection and the target imaging position needs to be the same, but it is difficult to ensure the same, so the subtraction processing is performed on the joint site I did not come.

  In the embodiment of the present invention, for each of the photographed main image and sub image, the position information on the affected area at the time of photographing is associated with each image and stored. Therefore, although there is a difference between the main image and the sub image, if the main image and the sub image having the same affected area position information are used, there is no difference in the photographing position between them, and the difference between the main image and the sub image is the contrast agent injection. It is possible to perform subtraction processing.

  When subtraction processing is performed in the image calculation unit 4b and a subtracted perspective image is generated, the perspective image is stored in the image information storage unit 4a. Then, based on the instruction from the operator (instruction from the system control unit 6), the corresponding fluoroscopic image is read from the image information storage unit 4a and the fluoroscopic image is displayed on the display unit 5 (ST6).

  As described above, it is impossible in the prior art by associating and storing affected part position information representing the position of the object to be captured with an image acquired by X-ray imaging, and processing the affected part position information as a key when performing subtraction processing. Therefore, it is possible to provide an imaging region holder, an X-ray diagnostic apparatus, and a method for generating an X-ray diagnostic image that enable subtraction processing on a moving subject.

  In addition, since it is possible to remove unnecessary shadows such as bones using subtraction processing, there is a restriction that it is necessary to shoot while avoiding bones in order to prevent the bones in the vicinity of the imaging target from being captured. Can be eliminated.

  In addition, the use of the imaging part holder can suppress the complexity of fixing the imaging target during imaging and unnecessary movement during imaging, so that a series of procedures such as preparation and imaging can be performed smoothly. It is possible to proceed.

  In particular, when the imaging part holder is used, the second part can move only in a specific direction (the bending direction of the joint part) and cannot move in other directions. Since movements other than in a specific direction are limited, it is possible to continuously take images (shoot as moving images) and observe joint parts as moving images.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description of the same components is omitted because it is duplicated.

  FIG. 6 is a block diagram showing the configuration of the X-ray diagnostic apparatus 1B according to the second embodiment of the present invention. The configuration differs from the X-ray diagnostic apparatus 1 </ b> A according to the first embodiment in that a storage unit 11 that exchanges information with the system control unit 6 is provided.

  In the storage unit 11 in the second embodiment, the imaging position of the joint part M2 to be imaged is stored in advance. That is, as described above, the joint part M2 subjected to the subtraction process can be observed with a moving image. However, in order to collect an image with a moving image, it is necessary to constantly irradiate the affected part with X-rays during imaging. Although this is necessary for photographing, it is not preferable in terms of exposure of the affected area. In addition, an image necessary for displaying the movement necessary for observing the joint part M2 may be acquired in a short time (a small amount of movement of the second part M3).

  Therefore, in the second embodiment, the storage unit 11 stores in advance the position to be imaged of the joint part M2 to be imaged. As described above, the system control unit 6 issues an X-ray irradiation command to the affected part to the X-ray generation unit 2, but the system control unit 6 plans to image the joint part M <b> 2 stored in the storage unit 11. Information about the position (hereinafter referred to as “imaging position information”) is compared with the position information of the affected area being imaged transmitted from the imaging region holder 50, and X-rays are obtained when the affected area position information matches the imaged position information. A command for X-ray irradiation to the affected area is issued to the generation unit 2.

  FIG. 7 is a flowchart showing a flow of imaging an X-ray diagnostic image in the second embodiment of the present invention. First, shooting conditions are set (ST31). The “imaging conditions” mentioned here include the above-mentioned X-ray irradiation conditions (for example, tube voltage applied to the X-ray tube 2a, tube current, X-ray irradiation time, etc.), and joints to be imaged. Information on the imaging position of the part M2 (imaging position information) is also included.

  The X-ray irradiation conditions (imaging conditions) including the set imaging position information are stored (saved) in the storage unit 11 (ST32). In this state, actual shooting starts.

  In imaging, the subject M is caused to move the joint part M2 without actually irradiating the joint part M2 with X-rays (in the embodiment of the present invention, the subject M moves the second part M3). Let the knee that is the joint part M2 bend). As described above, in this state, the system control unit 6 has not yet instructed the X-ray generation unit 2 to irradiate the affected part with X-rays. In the case where the imaging position information is so defined as that imaging from the start of movement of the joint part M2 is necessary, of course, X-ray irradiation is performed from the time when the movement of the second part M3 is started. Needless to say, will start.

  The system control unit 6 reads the shooting position information stored in the storage unit 11 (ST33). On the other hand, from the detection device 56 of the imaging part holder 50, the joint part M2 is bent by moving the second part M3, but the position information (affected part position information) of the second part M3 is system controlled. Input to the unit 6 (ST34). The affected part position information detected by the detection device 56 is transmitted not only to the image information storage unit 4a but also to the system control unit 6 in the second embodiment.

  The system control unit 6 compares the collected imaging position information with the affected area position information, and determines whether or not the imaging position information matches the affected area position information transmitted from the imaging site holder 50 (ST35). If they do not match (NO in ST35), it can be determined that the subject M has moved the second part M3, but has not yet reached the position to be photographed. Therefore, the system control unit 6 stands by until the movement (affected part position information) of the second part M3 by the subject M matches the imaging position information. Therefore, an imaging command (X-ray irradiation command) is not issued to the X-ray generator 2.

  If the imaging position information matches the affected area position information (YES in ST35), the system control unit 6 transmits an imaging command (X-ray irradiation command) to the X-ray generation unit 2 (ST36). At the same time, the high voltage generator 10 is instructed to apply a high voltage to the X-ray generator 2.

  Thereafter, the system control unit 6 determines whether or not the shooting related to all the shooting position information stored in the storage unit 11 has been completed (ST37). If there are still positions that need to be shot, the process returns to step ST35, and the above-described flow is repeated until shooting is completed for all shooting positions.

  As described above, when capturing an image of a subject, it is necessary in advance to acquire a captured image, not to irradiate X-rays from the beginning to the end of the imaging in accordance with the movement of the joint part of the subject. By avoiding unnecessary X-ray irradiation on the subject, control is performed so that X-ray irradiation is performed only when the joint part moves to a position to be taken and X-ray irradiation is not performed at other positions. Can do. As a result, it is possible to provide an imaging region holder, an X-ray diagnostic apparatus, and an X-ray diagnostic image generation method that can reduce unnecessary exposure of the subject.

  In addition, the affected part position information indicating the position of the imaging target is stored in association with the image acquired by X-ray imaging described in the first embodiment, and this affected part position information is used as a key when performing the subtraction process. By performing the processing, it is possible to provide an imaging region holder, an X-ray diagnostic apparatus, and an X-ray diagnostic image generation method that enable subtraction processing on a moving subject that has been impossible in the past. Of course, the effects of

  Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 X-ray diagnostic apparatus 2 X-ray generation part 3 X-ray detection part 4 Image calculation / memory | storage part 5 Display part 6 System control part 7 Mechanism part 8 Mechanism control part 9 Operation part 10 High voltage generation part 11 Storage part 50 Imaging | photography part holding | maintenance Tool 51 Mounting bracket 52 Post 53 First fixture 54 Second fixture 55 Shock absorber 56 Detector 57 Interface

Claims (8)

A first fixture for fixing a first part of the subject;
A second fixture for fixing a second part of the subject sandwiching a joint part to be imaged with the first part;
A shock absorber to which the second fixture is coupled;
A detection device for detecting a position of the second part when the joint part is bent by moving the second part;
An interface for transmitting information about the position of the second part detected by the detection device to the X-ray diagnostic device;
An imaging region holder comprising: A mounting bracket attached to one side in the longitudinal direction of the bed of the X-ray diagnostic apparatus;
One end of the mounting bracket is fixed, and a column that is erected upward in the vertical direction of the top plate;
A first fixture that is attached to the other end of the column and fixes a first part of the subject;
A second fixture for fixing a second part of the subject sandwiching a joint part to be imaged with the first part;
The second fixture is connected to one end thereof, and the other end is fixed to the column;
A detection device for detecting a position of the second part when the joint part is bent by moving the second part;
An interface for transmitting information about the position of the second part detected by the detection device to the X-ray diagnostic device;
An imaging region holder comprising:   The second fixing tool and the shock absorber are connected by using a connecting tool that allows the second fixing tool to rotate only in the bending direction of the joint part. The imaging region holder according to claim 1 or 2.   The first fixing tool and the support column are connected using a connecting tool that allows the first fixing tool to rotate only in a bending direction of the joint part. The imaging region holder according to claim 2. In an X-ray diagnostic apparatus including an imaging system having an X-ray generation unit and an X-ray detection unit,
An image calculation / storage unit that generates and stores an image based on image information captured by the imaging system;
A display unit for displaying an image generated by the image calculation / storage unit;
A system control unit for controlling the imaging system, the image calculation / storage unit, and the display unit;
The imaging region holder according to any one of claims 1 to 4,
With
The image calculation / storage unit stores the image information and the information related to the position of the second part when the joint part to be imaged transmitted from the imaging part holder is bent and stored, An X-ray diagnostic apparatus, wherein subtraction processing is performed using a plurality of pieces of image information having the same information regarding the position of the second part. The X-ray diagnostic apparatus further includes:
A storage unit for storing position information of a joint part scheduled to be imaged;
The system control unit compares the information on the position of the second part transmitted from the imaging part holder with the position information of the joint part scheduled to be captured stored in the storage unit, 6. The X-ray diagnosis apparatus according to claim 5, wherein when the information on the position of the part coincides with the position information of the joint part to be imaged, an imaging instruction is issued to the X-ray generation unit. Fixing the first part and the second part sandwiching the joint part to be imaged of the subject to the first fixing tool or the second fixing tool, respectively, of the imaging part holder;
Setting conditions for imaging the joint site using an X-ray diagnostic apparatus;
A first imaging step of storing information relating to the position of the imaging region holder at the time of imaging in association with image information acquired by imaging when imaging the joint region;
Injecting a contrast agent into the joint site;
A second imaging step of storing information relating to the position of the imaging region holder at the time of imaging in association with image information acquired by imaging when imaging the joint region;
Performing subtraction processing using a plurality of pieces of image information having the same information regarding the position of the imaging region holder among the image information acquired in the first imaging step and the second imaging step; ,
An X-ray diagnostic image generating method comprising: Regarding imaging of the joint part in the first imaging step and the second imaging step,
A step in which position information of a joint part to be imaged is stored in advance in a storage unit;
The position information of the joint part to be imaged is compared with the information related to the position of the second part transmitted from the imaging part holder, and the system control unit To issue shooting instructions,
The method for generating an X-ray diagnostic image according to claim 7.

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