JP6632847B2 - X-ray diagnostic equipment - Google Patents

Description

  Embodiments of the present invention relate to an X-ray diagnostic apparatus.

  2. Description of the Related Art Conventionally, an X-ray diagnostic apparatus sometimes observes a fluoroscopic image in order to determine an imaging condition of an X-ray image. For example, when an X-ray image is photographed on an X-ray TV bed, while observing a fluoroscopic image, the aperture of a part is adjusted or the X-ray irradiation conditions are determined. That is, in the X-ray TV bed, while observing the fluoroscopic image, the aperture is adjusted so that the X-ray is radiated only to the part to be imaged, and the tube voltage and the tube voltage adjusted by the body thickness of the subject are adjusted. Irradiation conditions such as tube current are determined.

  As described above, when the adjustment of the aperture and the irradiation conditions of the X-ray are performed under the fluoroscopy, the exposure dose increases accordingly. Therefore, in recent years, a technique has been known in which exposure is reduced by virtual collimation for displaying the position of an aperture on an LIH (Last Image Hold) image collected by fluoroscopy.

JP 2007-244484 A

  The problem to be solved by the present invention is to provide an X-ray diagnostic apparatus that can reduce exposure.

An X-ray diagnostic apparatus according to an embodiment includes an X-ray tube, a detector, an aperture, a collection unit, a calculation unit, and a display control unit. The X-ray tube generates X-rays. The detector detects X-rays generated by the X-ray tube and transmitted through the subject. The aperture adjusts the irradiation range of the X-ray. The collection unit collects a camera image at a position of X-ray imaging with respect to the subject including a visual field range of the detector. Calculation unit calculates the position of the have your camera image capturing range and the diaphragm shows a photographable range of the X-ray image. The display control unit causes the display unit to display a display image indicating the shooting range and the aperture at the calculated position on the camera image. The display control unit, when an operation of changing the size of the subject in the camera image is performed, a change amount corresponding to the change amount of the size of the subject in the camera image, in the display image The size of the shooting range is changed.

FIG. 1 is a diagram for explaining an example of the X-ray image diagnostic system according to the first embodiment. FIG. 2 is a diagram illustrating an example of a configuration of the X-ray diagnostic apparatus according to the first embodiment. FIG. 3 is a diagram illustrating an example of a camera image according to the first embodiment. FIG. 4 is a diagram illustrating a shooting range on a camera image according to the first embodiment. FIG. 5 is a diagram for explaining a change in the photographing range according to the first embodiment. FIG. 6 is a diagram for explaining a change in the photographing range according to the first embodiment. FIG. 7 is a diagram illustrating an example of a display image displayed under the control of the display control function according to the first embodiment. FIG. 8 is a flowchart illustrating a procedure of processing by the X-ray diagnostic apparatus according to the first embodiment. FIG. 9A is a diagram illustrating an example of the diaphragm blade according to the second embodiment. FIG. 9B is a diagram illustrating an example of the diaphragm blade according to the second embodiment. FIG. 10 is a diagram for explaining camera positions and camera switching according to the second embodiment.

  Hereinafter, an embodiment of an X-ray diagnostic apparatus will be described in detail with reference to the accompanying drawings. Hereinafter, an X-ray image diagnostic system including the X-ray diagnostic apparatus according to the present application will be described as an example. Hereinafter, as an X-ray diagnostic apparatus according to the present application, an X-ray diagnostic apparatus that performs examinations and treatments on the digestive tract, urology, plastic surgery, IVR (Interventional Radiology), and the like will be described as an example. The embodiment according to the present application is not limited to this.

(First embodiment)
First, an example of an X-ray diagnostic imaging system according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining an example of the X-ray image diagnostic system according to the first embodiment. For example, as shown in FIG. 1, the X-ray image diagnostic system according to the first embodiment includes an X-ray diagnostic apparatus main body including an X-ray tube, a bed, an X-ray detector, and a proximity operation including a fluoroscopic monitor. The console and a remote control console including an image processing device, a system monitor, a fluoroscopic monitor and the like are interconnected. For example, an operator in an operation room operates a remote console to raise or lower a bed on which a patient (subject) is placed, or to move an image system such as an X-ray tube or an X-ray movable diaphragm up and down. In addition, the apparatus main body is caused to perform an operation such as performing the operation, and at the same time, to perform fluoroscopy and imaging. Then, the operator observes a fluoroscopic image displayed on a fluoroscopic monitor provided on a remote console, a captured image, a fluoroscopic image displayed on a system monitor, and the like. Further, for example, an operator in the examination room operates the proximity console to cause the apparatus main body to execute the same processing as the above-described processing, and a fluoroscopic monitor provided in the proximity console, an examination room, or the like. Observe the various images displayed on the monitor.

  Next, an example of the configuration of the X-ray diagnostic apparatus according to the first embodiment will be described. FIG. 2 is a diagram illustrating an example of a configuration of the X-ray diagnostic apparatus 1 according to the first embodiment. The X-ray diagnostic apparatus 1 includes, for example, an apparatus main body 100 and a remote console 200 as shown in FIG. As shown in FIG. 2, the apparatus main body 100 includes a high voltage generator 11, an X-ray tube 12, an X-ray movable aperture 13, a bed 14, a grid 15, an X-ray detector 16, and a bed moving mechanism. 17, a bed mechanism control circuit 18, an iris control circuit 19, and an X-ray control circuit 20 are provided, for example, in an examination room. As shown in FIG. 2, the remote console 200 includes an input circuit 210, a display 220, an A / D converter 230, a pixel value calculation circuit 240, an image data generation circuit 250, a storage circuit 260, It has a processing circuit 270 and a processing circuit 280, and is arranged, for example, in an operation room.

  Although not shown, the X-ray diagnostic apparatus 1 may be connected to an injector or the like for injecting a contrast agent from a catheter inserted into the subject. Although not shown, the proximity console has a fluoroscopic monitor, displays an image generated by the X-ray diagnostic apparatus 1, and receives various operations for operating the X-ray diagnostic apparatus 1. More specifically, the proximity console is connected to the X-ray diagnostic apparatus 1 by wire or wireless communication, and transmits information of the operation received via the input circuit to the X-ray diagnostic apparatus 1, thereby allowing the remote console 200 to operate. Causes the processing circuit 280 to execute various controls.

  Here, in the X-ray diagnostic apparatus 1 shown in FIG. 2, each processing function is stored in the storage circuit 260 in the form of a program executable by a computer. The bed mechanism control circuit 18, the aperture control circuit 19, the X-ray control circuit 20, the pixel value calculation circuit 240, the image data generation circuit 250, the image processing circuit 270, and the processing circuit 280 read and execute a program from the storage circuit 260. By doing so, the processor realizes a function corresponding to each program. In other words, each circuit in a state where each program is read has a function corresponding to the read program.

  The term “processor” used in the above description may be, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an application specific integrated circuit (ASIC), a programmable logic device (ASIC), or the like. For example, it means a circuit such as a Simple Programmable Logic Device (SPLD), a Complex Programmable Logic Device (CPLD), and a Field Programmable Gate Array (FPGA). The function is realized by reading and executing the program stored in the storage circuit, and the program may be directly incorporated in the circuit of the processor instead of storing the program in the storage circuit. In this case, the processor realizes a function by reading and executing a program incorporated in the circuit.In addition, each processor of the present embodiment is not limited to a case where each processor is configured as a single circuit, but a plurality of processors. Independent circuits may be combined and configured as one processor to realize its function.

  The high voltage generator 11 generates a high voltage under the control of the X-ray control circuit 20 and supplies the generated high voltage to the X-ray tube 12. The X-ray tube 12 generates X-rays using a high voltage supplied from the high voltage generator 11.

  The X-ray movable diaphragm 13 narrows down the X-rays generated by the X-ray tube 12 so as to be selectively irradiated on the region of interest of the subject under the control of the diaphragm control circuit 19. For example, the X-ray movable diaphragm 13 has four slidable diaphragm blades. The X-ray movable diaphragm 13 squeezes the X-rays generated by the X-ray tube 12 and irradiates the object with the X-rays by sliding these diaphragm blades under the control of the diaphragm control circuit 19. The couch 14 is a bed on which the subject is placed.

  The grid 15 is arranged between the bed 14 and the X-ray detector 16 and removes a part of the scattered radiation included in the X-ray transmitted through the subject. For example, in the grid 15, a lead foil that absorbs X-rays and an intermediate substance that absorbs less X-rays are alternately arranged. Here, the grid 15 is a converging grid in which each lead foil is inclined toward a point on the center line of the grid in a direction perpendicular to the grid surface, or a parallel grid in which each lead foil is arranged in parallel. The X-ray detector 16 detects X-rays transmitted through the grid 15. For example, the X-ray detector 16 has detection elements arranged in a matrix. Each detection element converts the X-rays transmitted through the grid 15 into an electric signal, accumulates the electric signal, and transmits the accumulated electric signal to an A (Analog) / D (Digital) converter 230 of the remote console 200.

  The couch moving mechanism 17 is a mechanism for moving and moving the couch 14 under the control of the couch mechanism control circuit 18. The couch mechanism control circuit 18 controls the movement and the tilt of the couch 14 by controlling the couch moving mechanism 17 under the control of the processing circuit 280 of the remote console 200 described later. The aperture control circuit 19 adjusts the opening of the aperture blades of the X-ray movable aperture 13 under the control of the processing circuit 280 of the remote console 200 described later, thereby controlling the amount of X-rays irradiated to the subject. Control the irradiation range.

  The X-ray control circuit 20 causes the high voltage generator 11 to generate a high voltage under the control of the processing circuit 280 of the remote console 200 described later, and causes the generated high voltage to be supplied to the X-ray tube 12. For example, the X-ray control circuit 20 applies the applied voltage of the high-voltage generator 11 based on the X-ray irradiation conditions supplied from the processing circuit 280 and the pixel value information supplied from the pixel value calculation circuit 240 described later. By controlling time, application timing, and the like, the tube current, tube voltage, X-ray irradiation time, X-ray irradiation timing, pulse width, and the like of the X-ray tube 12 are controlled.

  The input circuit 210 is arranged in an operation room and receives various instructions from an operator who operates the X-ray diagnostic apparatus 1. For example, the input circuit 210 is realized by a mouse, a keyboard, a button, a trackball, a joystick, a touch panel, and the like. The input circuit 210 is connected to the processing circuit 280, converts an input operation received from an operator into an electric signal, and outputs the electric signal to the processing circuit 280.

  The display 220 displays an image generated by the X-ray diagnostic apparatus 1 and also displays a GUI (Graphical User Interface) for receiving an operator's instruction. For example, the display 220 is the fluoroscopic monitor shown in FIG. 1 or the system monitor.

  The A / D converter 230 is connected to the X-ray detector 16, converts an analog signal input from the X-ray detector 16 into a digital signal, and outputs the converted digital signal (projection data) to the image data generation circuit 250. Forward.

  The pixel value calculation circuit 240 sets a predetermined region of interest for the original image data supplied from the image data generation circuit 250, and calculates an average pixel value of the set region of interest. Then, the pixel value calculation circuit 240 performs automatic brightness adjustment (ABC) by supplying a result of comparison between the calculated average pixel value and a predetermined threshold value to the X-ray control circuit 20. With this control, the X-ray diagnostic apparatus 1 can constantly collect original image data having the optimum luminance.

  The image data generation circuit 250 generates original image data (X-ray image data) from the projection data supplied from the A / D converter 230. Specifically, the image data generation circuit 250 generates two-dimensional original image data by sequentially storing the data elements of the projection data supplied from the A / D converter 230 in the storage circuit 260. The storage circuit 260 stores the original image data generated by the image data generation circuit 250 and the display image generated by the image processing circuit 270.

  The image processing circuit 270 performs various types of image processing on the original image data stored in the storage circuit 260 or on the corrected image data. For example, the image processing circuit 270 performs image processing for display (spatial filter processing, window conversion, gamma curve processing, and the like).

  The processing circuit 280 controls the operation of the entire X-ray diagnostic imaging system. For example, the processing circuit 280 controls the X-ray control circuit 20 according to the input circuit of the proximity console or the operator's instruction transferred from the input circuit 210, and adjusts the voltage supplied to the X-ray tube 12. The X-ray dose applied to the subject and ON / OFF are controlled. Further, for example, the processing circuit 280 controls the bed mechanism control circuit 18 in accordance with an instruction of the operator, and adjusts the movement and the tilt of the bed 14. Further, for example, the processing circuit 280 controls the aperture control circuit 19 in accordance with an instruction of the operator, and adjusts the opening degree of the aperture blades of the X-ray movable aperture 13 so that the X-ray emitted to the subject is irradiated. To control the irradiation range.

  Further, the processing circuit 280 controls automatic brightness adjustment by the pixel value calculation circuit 240, original image data generation processing by the image data generation circuit 250, image processing or analysis processing by the image processing circuit 270, etc., according to an instruction of the operator. . The processing circuit 280 controls the display 220 to display a GUI for receiving an operator's instruction, a display image stored in the storage circuit 260, and the like. Further, the processing circuit 280 can also control the injection of the contrast agent by transmitting signals for starting and ending the injection of the contrast agent to the injector.

  The configuration of the X-ray diagnostic apparatus 1 has been described above. Under such a configuration, the X-ray diagnostic apparatus 1 according to the present application makes it possible to reduce exposure. Specifically, the X-ray diagnostic apparatus 1 reduces exposure by using a camera image for adjusting the aperture and setting the X-ray irradiation conditions by the processing by the processing circuit 280 described in detail below. As described above, in the related art, while observing a fluoroscopic image, the aperture is adjusted, X-ray irradiation conditions, and the like are determined. Further, even when a virtual collimator is used, a perspective image is used. Therefore, in the prior art, there was a certain limit in reducing the exposure. Therefore, in the present embodiment, exposure is reduced by using a camera image instead of a fluoroscopic image for adjusting the aperture and setting the conditions of X-ray irradiation.

  Specifically, the camera image collection function 280a collects a camera image of the position of the X-ray imaging with respect to the subject including the visual field range of the X-ray detector 16. For example, the X-ray diagnostic apparatus 1 includes a camera that captures an image, and the camera image collection function 280a collects a camera image captured by the camera. FIG. 3 is a diagram illustrating an example of a camera image according to the first embodiment. FIG. 3 shows an example in which a camera 300 is arranged in the apparatus main body 100 of the X-ray diagnostic apparatus 1. For example, as shown in FIG. 3, the camera 300 is arranged near the movable X-ray aperture 13 such that the field of view 51 of the camera 300 includes the field of view 52 of the X-ray detector 16. That is, even if the couch 14 and the X-ray detector 16 move in the vertical direction, the camera 300 is arranged so as to include the imaging range of the X-ray image.

  Here, when the camera 300 is arranged in the apparatus main body 100, the position of the imaging range of the X-ray image in the camera image captured by the camera 300 is defined. That is, the imaging range of the X-ray image at the coordinates of the camera image is set. FIG. 4 is a diagram illustrating a shooting range on a camera image according to the first embodiment. For example, by inputting the position of the imaging range in the camera image when the imaging system of the X-ray image (the X-ray tube 12, the couch 14, the X-ray detector 16, and the like) is arranged, the position shown in FIG. As shown in (A), an image in which a shooting range is superimposed on a camera image can be displayed.

  Here, when the apparatus main body 100 is installed, the position of the diaphragm blades in the X-ray movable diaphragm 13 with respect to the imaging range is defined. Therefore, by acquiring information on the position of the aperture blade with respect to the shooting range, the shooting range and the aperture can be displayed on the camera image, for example, as shown in FIG. 4B. That is, as shown in FIG. 4B, a straight line indicating the diaphragm blade whose position moves according to the actual movement of the diaphragm blade can be displayed on the camera image. When an X-ray image is captured, the camera image collection function 280a collects, from the camera 300, a camera image in which the imaging range and the position of the aperture blade are defined.

  Returning to FIG. 2, the calculation function 280b calculates the imaging range and the aperture position of the X-ray imaging in the camera image. More specifically, the calculation function 280b calculates the camera image based on the positional relationship between the X-ray tube 12, the X-ray detector 16, and the bed 14 on which the subject is placed, and the magnification of the X-ray detector 16. The photographing range and the position of the aperture blade are calculated. As described above, when the camera 300 is mounted on the apparatus main body 100, the position of the shooting range in the camera image is defined, and further, the position of the aperture blade in which the position with respect to the shooting range is defined in the camera image is defined. .

  Here, the photographing range in the camera image changes depending on the distance between the X-ray focal point and the X-ray detector 16, the distance between the X-ray focal point and the bed, and the magnification of the detector. Therefore, the calculation function 280b corrects the photographing range according to them. FIGS. 5 and 6 are diagrams for explaining a change in the photographing range according to the first embodiment. FIG. 5 shows changes in the imaging range depending on the distance between the X-ray focal point and the X-ray detector 16 and the distance between the X-ray focal point and the bed. FIG. 6 shows a change in the photographing range depending on the magnification of the detector.

  For example, as shown in FIG. 5A, the size at which the subject is projected by the ratio of the distance “L1” from the X-ray focal point to the bed and the distance “L2” from the X-ray focal point to the X-ray detector. Changes, and the region of the subject included in the imaging range changes. For example, as shown in FIG. 5B, when the distance “L1” is increased by lowering the bed 14 without changing the distance “L2”, the area of the subject included in the imaging range is increased. . That is, since the distance “L2” between the X-ray focal point and the X-ray detector does not change, the size of the imaging range does not change, but the region of the subject included in the imaging range changes. The shooting range will be expanded.

  The calculation function 280b corrects the shooting range in consideration of the above. That is, the size of the imaging range is changed without changing the size of the subject shown in the camera image. Specifically, the calculation function 280b calculates a change in the region of the subject included in the imaging range in the camera image when an operation of changing the size of the subject in the camera image is performed, and calculates the calculated change. The amount of change in the size of the imaging range corresponding to the amount of change in the size of the subject in the camera image is calculated based on For example, as shown in FIG. 5, when the bed 14 is lowered, the distance “L1” is increased, and the size of the subject captured by the camera 300 is reduced, the calculation function 280b determines the subject on the camera image. The size of the shooting range with the size kept constant is calculated. This makes it possible to provide an easy-to-view screen in which the size of the subject in the camera image does not change.

  Further, for example, when the distance “L2” changes without changing the distance “L1”, the calculating function 280b calculates the amount of change in the shooting range according to the change in the distance “L2”. That is, since the distance “L1” does not change, the subject size on the camera image is constant, and the size of the imaging range of the X-ray image for the subject directly changes. Therefore, the calculation function 280b calculates the shooting range according to the change in the distance “L2”.

  Next, when the magnification of the X-ray detector 16 is changed, the calculation function 280b calculates an imaging range according to the change of the magnification. For example, when the image is enlarged from the state shown in FIG. 6A, the calculation function 280b calculates the photographing range according to the magnification as shown in FIG.

  As described above, the calculation function 280b calculates the distance between the X-ray focal point and the X-ray detector, the distance between the X-ray focal point and the bed, and the enlargement ratio of the detector based on the predefined imaging range on the camera image. And the position of the aperture blade with respect to the imaging range is calculated. That is, the calculation function 280b calculates the imaging range of the X-ray image in the camera image and the position of the aperture blade.

  Returning to FIG. 2, the display control function 280c causes the display 220 to display a display image indicating the shooting range and the aperture at the calculated position on the camera image. FIG. 7 is a diagram illustrating an example of a display image displayed under the control of the display control function 280c according to the first embodiment. For example, as shown in FIG. 7A, the display control function 280c sets the X-ray image shooting range at the corresponding position of the camera image based on the shooting range and the position of the aperture blade calculated by the calculation function 280b. And a display image showing the aperture blades.

  Here, needless to say, the photographing range and the position of the aperture blade in the display image change following the moving operation of the bed 14 and the X-ray detector 16. That is, when the operator moves the position of the bed 14 or operates the X-ray movable diaphragm 13 to change the position of the diaphragm blade, the calculation function 280b determines the imaging range and the position of the diaphragm blade according to the change. Calculate immediately. Then, the display control function 280c displays a display image indicating the photographing range and the aperture blade at the calculated position. The calculation function 280b calculates the current shooting range and aperture blade position for each frame of the camera image collected by the camera 300, and the display control function 280c calculates the shooting range and aperture to the position calculated for each frame. By showing the blades and displaying them in a moving image, it is possible to display an imaging range in which the size changes gradually and an aperture blade in which the position changes gradually. That is, the display control function 280c moves the position of the line indicating the aperture on the camera image in conjunction with the movement of the aperture blade. By observing the display image displayed on the display 220 under the control of the display control function 280c, the operator can adjust the aperture of the subject without looking at the fluoroscopic image.

  In addition, when an operation of changing the size of the subject in the camera image is performed, the display control function 280c displays the change amount calculated by the calculation function 280b on the camera image in a state where the size of the subject is fixed. A display image showing the photographing range with the changed size is displayed. Thereby, the operator can observe an easy-to-view screen in which the size of the subject in the camera image does not change.

  Further, the display control function 280c can display an X-ray image generated based on the X-ray transmitted through the subject at a corresponding position of the display image. That is, when X-ray imaging of the subject is started, the display control function 280c superimposes and displays the X-ray image on the imaging range on the camera image. For example, as shown in FIG. 7B, the display control function 280c can display an X-ray image captured by the apparatus main body 100 in a manner superimposed on a camera image.

  Returning to FIG. 2, the setting function 280d sets the X-ray irradiation conditions based on the target part of X-ray imaging, the size of the imaging range, the position of the aperture, and the magnification of the detector. For example, the storage circuit 260 stores irradiation conditions set in advance for each part, the size of the imaging range, and the magnification of the X-ray detector 16. The setting function 280d sets a preset X-ray irradiation condition (tube voltage, tube current, etc.) based on information on the imaging region and information on the imaging range and magnification set while observing the display image. It is read from the storage circuit 260 and set. Then, the X-ray control circuit 20 controls the X-ray irradiation based on the X-ray irradiation conditions set by the setting function 280d.

  Next, the processing of the X-ray diagnostic apparatus 1 according to the first embodiment will be described with reference to FIG. FIG. 8 is a flowchart illustrating a procedure of a process performed by the X-ray diagnostic apparatus 1 according to the first embodiment. Steps S101 and S102 shown in FIG. 8 are steps executed by the processing circuit 280 reading out a program corresponding to the camera image collection function 280a from the storage circuit 260. In step S101, the processing circuit 280 determines whether or not the camera is in the camera image display mode. Then, if it is determined that the camera image display mode is set (Yes at Step S101), at Step S102, the processing circuit 280 collects camera images.

  Step S103 in FIG. 8 is a step in which the processing circuit 280 reads a program corresponding to the calculation function 280b from the storage circuit 260 and executes the program. In step S103, the processing circuit 280 calculates the shooting range and the position of the aperture blade in the camera image. Step S104 in FIG. 8 is a step in which the processing circuit 280 reads a program corresponding to the display control function 280c from the storage circuit 260 and executes the program. In step S104, the processing circuit 280 displays the shooting range and the position of the aperture blade on the camera image.

  Step S105 in FIG. 8 is a step in which the processing circuit 280 reads a program corresponding to the calculation function 280b from the storage circuit 260 and executes the program. In step S105, the processing circuit 280 determines whether a moving operation of the imaging system such as the bed 14 or the X-ray movable diaphragm 13 has been received. Step S106 in FIG. 8 is a step in which the processing circuit 280 reads a program corresponding to the setting function 280d from the storage circuit 260 and executes the program. If the moving operation has not been received (No at Step S105), at Step S106, the processing circuit 280 sets X-ray irradiation conditions. When the moving operation is received in step S105 (Yes in step S105), the process returns to step S103, and the processing circuit 280 calculates the photographing range and the position of the aperture blade in the camera image.

  Step S107 in FIG. 8 is a step in which the processing circuit 280 reads a program corresponding to a processing function from the storage circuit 260 and executes the program. In step S107, the processing circuit 280 determines whether shooting has been started. If the shooting has not been started (No at Step S107), the process returns to Step S105 to make a determination. On the other hand, when the photographing is started (Yes at Step S107), the processing circuit 280 superimposes and displays the X-ray image on the camera image (Step S108). Step S108 is a step in which the processing circuit 280 reads a program corresponding to the display control function 280c from the storage circuit 260 and executes the program.

  When it is determined in step S101 that the camera image display mode is not set (No in step S101), the processing circuit 280 generates and displays a fluoroscopic image in step S109. Take an image.

  As described above, according to the first embodiment, the X-ray tube 12 generates X-rays. An X-ray detector 16 detects X-rays generated by the X-ray tube 12 and transmitted through the subject. The X-ray movable diaphragm 13 adjusts the X-ray irradiation range. The camera image collecting function 280a collects a camera image of the position of the X-ray imaging with respect to the subject including the visual field range of the X-ray detector 16. The calculation function 280b calculates an imaging range and an aperture position of X-ray imaging in the camera image. The display control function 280c causes the display 220 to display a display image indicating the shooting range and the aperture at the calculated position on the camera image. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment can adjust the aperture without using a fluoroscopic image, and can reduce exposure.

  Further, according to the first embodiment, the calculation function 280b determines the positional relationship between the X-ray tube 12, the X-ray detector 16, and the bed 14 on which the subject is placed, and the magnification of the X-ray detector 16. Based on the image, the photographing range and the aperture position in the image are calculated. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment can accurately calculate the imaging range and the aperture position.

  Further, according to the first embodiment, the setting function 280d sets the X-ray irradiation conditions based on the target part of the X-ray imaging, the size of the imaging range, the position of the aperture, and the magnification of the X-ray detector 16. Set. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment can set X-ray irradiation conditions without using a fluoroscopic image, and can further reduce exposure.

  Further, according to the first embodiment, the display control function 280c displays an X-ray image generated based on the X-ray transmitted through the subject at a position corresponding to the display image. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment can display an X-ray image in accordance with the actual body of the subject.

(Second embodiment)
The first embodiment has been described above, but may be implemented in various different forms other than the first embodiment.

  The aperture blade described in the first embodiment is merely an example, and the embodiment is not limited to this. Hereinafter, another example of the aperture blade will be described with reference to FIGS. 9A and 9B. 9A and 9B are diagrams illustrating an example of the diaphragm blade according to the second embodiment. For example, as shown in FIG. 9A, the X-ray movable diaphragm 13 may have a case where the X-ray movable diaphragm 13 has four diaphragm blades capable of changing the diaphragm blades to an arbitrary direction. In such a case, the display control function 280c can perform display according to the direction of the aperture as shown in FIG. 9A. Further, as shown in FIG. 9B, the X-ray movable diaphragm 13 may have a diaphragm blade having a predetermined shape. For example, the display control function 280c can perform display according to the shape as shown in FIG. 9B.

  Further, in the first embodiment described above, the case where the camera 300 is arranged near the X-ray movable diaphragm 13 has been described as an example. However, the embodiment is not limited to this, and for example, a case where the camera 300 is arranged on the X-ray detector 16 side may be used. FIG. 10 is a diagram for explaining the position of the camera 300 and switching of the camera 300 according to the second embodiment.

  As shown in FIG. 10, in an X-ray diagnostic apparatus 1 according to the second embodiment, cameras 300 are arranged on an X-ray focal point side and an X-ray detector side, respectively. Here, the camera image collection function 280a collects camera images by switching the camera 300 that captures camera images according to the position of the X-ray tube 12 with respect to the subject. For example, as shown in FIG. 10, the camera image collection function 280a sets the camera on the X-ray detector side to “OFF” when the X-ray tube 12 is “over tube” located above the subject. As it is, the camera 300 on the X-ray tube (X-ray focus) side is turned “ON” to collect camera images. On the other hand, when the X-ray tube 12 is an “under tube” located below the subject, the camera image collection function 280a keeps the camera on the X-ray tube (X-ray focus) side “OFF”. The camera 300 on the X-ray detector side is turned “ON” to collect camera images. Thereby, camera images can be collected according to the method of capturing an X-ray image.

  Each component of each device illustrated in the first embodiment is a functional concept and does not necessarily need to be physically configured as illustrated. That is, the specific form of distribution / integration of each device is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / arbitrarily divided into arbitrary units according to various loads and usage conditions. Can be integrated and configured. Further, all or any part of each processing function performed by each device can be realized by a CPU and a program analyzed and executed by the CPU, or can be realized as hardware by wired logic.

  The control method described in the first embodiment can be realized by executing a control program prepared in advance on a computer such as a personal computer or a workstation. This control program can be distributed via a network such as the Internet. The control program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk (FD), a CD-ROM, an MO, and a DVD, and can be executed by being read from the recording medium by the computer.

  As described above, according to the embodiment, the X-ray diagnostic apparatus of the present embodiment makes it possible to reduce exposure.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 X-ray diagnostic apparatus 12 X-ray tube 13 X-ray movable diaphragm 16 X-ray detector 280 Processing circuit
280a Camera image collection function 280b Calculation function 280c Display control function 280d Setting function

Claims (8)

An X-ray tube for generating X-rays,
A detector for detecting X-rays generated by the X-ray tube and transmitted through a subject;
An aperture for adjusting the X-ray irradiation range;
A collection unit that collects a camera image of a position of X-ray imaging with respect to the subject including a field of view of the detector,
A calculation unit for calculating the position of the have your camera image capturing range and the diaphragm shows a photographable range of the X-ray image,
A display control unit that causes a display unit to display a display image indicating the shooting range and the aperture at the calculated position on the camera image,
Equipped with a,
The display control unit, when an operation of changing the size of the subject in the camera image is performed, a change amount corresponding to the change amount of the size of the subject in the camera image, in the display image wherein Ru changing the size of the imaging range, X-rays diagnostic apparatus. The calculator is an enlargement of the detector that indicates a positional relationship between the X-ray tube, the detector, and a bed on which the subject is placed, and a number of pixels in the display unit corresponding to a detection element in the detector. The X-ray diagnostic apparatus according to claim 1, wherein the X-ray diagnostic apparatus calculates the imaging range and the aperture position in the camera image based on the ratio. Wherein arranged in the X-ray tube side and the detector side, further comprising a camera for capturing the camera image,
The collection unit, in response to said position of said X-ray tube to the subject, the camera image is switched to a camera for photographing a collecting said camera image, X-ray diagnostic apparatus according to claim 1 or 2. Based on the magnification of the detector indicating the target site of the X-ray imaging, the size of the imaging range, the position of the aperture, and the number of pixels in the display unit corresponding to the detection element in the detector. The X-ray diagnostic apparatus according to any one of claims 1 to 3, further comprising a setting unit configured to set irradiation conditions of the X-ray.   The X-ray according to any one of claims 1 to 4, wherein the display control unit causes an X-ray image generated based on the X-ray transmitted through the subject to be displayed at a position corresponding to the display image. Diagnostic device. The X-ray diagnostic apparatus according to claim 5, wherein, when X-ray imaging of the subject is started, the display control unit displays an X-ray image superimposed on the imaging range on the camera image. The calculation unit calculates a change in an area of the subject included in the imaging range in the camera image when an operation of changing the size of the subject in the camera image is performed, and calculates the calculated change. Based on the calculated amount of change in the size of the imaging range corresponding to the amount of change in the size of the subject in the camera image,
The display control unit according to claim 1, wherein, on the camera image in a state where the size of the subject is fixed, a display image indicating an imaging range whose size is changed by the calculated change amount is displayed. The X-ray diagnostic apparatus according to claim 1. The X-ray diagnostic apparatus according to any one of claims 1 to 7, wherein the display control unit moves a position of a line indicating an aperture on the camera image in conjunction with a movement of the aperture.