X-ray fluoroscopic imaging device

Abstract

This fluoroscopic imaging device (100) is provided with a top plate (2), a top plate operation unit (51), and a control unit (31) configured so that, in a first control when the movement of the top plate is not prohibited, the top plate is moved on the basis of an operation input to the top plate operation unit, and, in a second control when the movement of the top plate is prohibited, the top plate is moved on the basis of an operation input to the top plate operation unit. The center (42a) of the X-ray irradiation field (42) of the X-ray image (41) in the display unit (40) is moved without moving the top plate on the basis of an operation input to the top plate operation unit.

Description

Technical Field

[0001] The present invention relates to an X-ray fluoroscopic imaging apparatus. Background Art

[0002] Conventionally, an X-ray fluoroscopic imaging apparatus including an X-ray irradiation unit, an X-ray detection unit, and a top plate has been known. Such an X-ray fluoroscopic imaging apparatus is disclosed, for example, in Japanese Patent Application Laid-Open No. 2018-29922.

[0003] In the above-mentioned Japanese Patent Application Laid-Open No. 2018-29922, an X-ray fluoroscopic imaging system (X-ray fluoroscopic imaging apparatus) is disclosed, which includes: an X-ray tube (X-ray irradiation unit) that irradiates X-rays; an X-ray image detector (X-ray detection unit) that detects the X-rays irradiated onto a subject; and a top plate that is used to place the subject. The X-ray image detector is provided below the top plate. The X-ray image detector is configured to be movable along the long side direction of the top plate between both end edges extending along the short side direction of the top plate.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-29922 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] Here, for example, in an examination in which a device is introduced into a subject's body such as an endoscopic examination, from the viewpoint of visual confirmation, it is more preferable that the region of interest is located at a position closer to the center than the periphery of the X-ray irradiation field. However, in such an examination, from the viewpoint of safety, there is a problem in moving the subject by moving the top plate in a state where the device has been introduced into the subject's body, and thus the movement of the top plate on which the subject is placed is sometimes prohibited during the examination. As a result, even when the position of the region of interest changes according to the position of the device, the central position of the X-ray irradiation field cannot be adjusted by moving the top plate. Therefore, it is desired to be able to adjust the central position of the X-ray irradiation field and to intuitively achieve the above adjustment for the operator and the technician even when the movement of the top plate is prohibited during treatment, examination, etc.

[0009] The present invention has been completed to solve the above problems, and an object of the present invention is to provide an X-ray fluoroscopic imaging apparatus that can adjust the central position of the X-ray irradiation field and can intuitively achieve the above adjustment for the operator and the technician even when the movement of the top plate is prohibited during treatment, examination, etc.

[0010] Solution for solving problems

[0011] An X-ray fluoroscopy apparatus according to an aspect of the present invention includes: an imaging unit including an X-ray irradiation unit that irradiates an object to be examined with X-rays and an X-ray detection unit that detects X-rays irradiated by the X-ray irradiation unit; an X-ray image generation unit that generates an X-ray image based on a detection signal detected by the X-ray detection unit; a top plate that is disposed between the X-ray irradiation unit and the X-ray detection unit, on which the object to be examined can be placed and which can move in a horizontal direction; a top plate moving mechanism that moves the top plate; a top plate operation unit that receives an operation input for moving the top plate; a top plate locking unit that prohibits the movement of the top plate; a display unit that displays the X-ray image generated by the X-ray image generation unit; and a control unit that controls the movement of the top plate and controls the display unit to display the X-ray image. The control unit is configured to, in a first control when the movement of the top plate is not prohibited by the top plate locking unit, move the top plate based on an operation input to the top plate operation unit. The control unit is configured to, in a second control when the movement of the top plate is prohibited by the top plate locking unit, without moving the top plate, move the center of the irradiation field of the X-rays in the X-ray image in the display unit based on the operation input to the top plate operation unit.

[0012] Effects of the invention

[0013] In the X-ray fluoroscopy apparatus according to an aspect of the present invention, as described above, the control unit is configured to, in a first control when the movement of the top plate is not prohibited by the top plate locking unit, move the top plate based on an operation input to the top plate operation unit. The control unit is configured to, in a second control when the movement of the top plate is prohibited by the top plate locking unit, without moving the top plate, move the center of the irradiation field of the X-rays in the X-ray image in the display unit based on the operation input to the top plate operation unit. Thus, even when the movement of the top plate is prohibited, it is possible to move the center of the irradiation field of the X-rays in the X-ray image in the display unit while continuing to use the top plate operation unit that is used to move the top plate when the movement of the top plate is not prohibited. Therefore, even when the movement of the top plate is prohibited during treatment, examination, etc., it is possible to adjust the center position of the irradiation field of the X-rays and to visually achieve the above adjustment for the operator and technician. Description of the drawings

[0014] Figure 1 is a block diagram showing the structure of an X-ray fluoroscopy apparatus according to an embodiment.

[0015] Figure 2 is a schematic view showing the main body of an X-ray fluoroscopy apparatus according to an embodiment.

[0016] Figure 3It is a schematic diagram showing an example of a plurality of shielding blades in a first group and a plurality of shielding blades in a second group according to an embodiment.

[0017] Figure 4 It is a block diagram showing an example of the structure of a moving mechanism and a rotating mechanism included in the X-ray fluoroscopic imaging apparatus main body according to an embodiment.

[0018] Figure 5 It is a schematic diagram showing an example of an operation console according to an embodiment.

[0019] Figure 6 It is an explanatory schematic diagram for explaining an example of centering processing and magnification / reduction processing performed by the main control unit in an embodiment.

[0020] Figure 7 It is a flowchart for explaining movement control processing and display control processing performed by the main control unit in an embodiment. Detailed Embodiment

[0021] Hereinafter, embodiments for embodying the present invention will be described based on the drawings.

[0022] (Overall Structure of X-ray Fluoroscopic Imaging Apparatus)

[0023] Refer to Figures 1 to 5 to describe the overall structure of an X-ray fluoroscopic imaging apparatus 100 according to an embodiment.

[0024] As Figure 1 shown, the X-ray fluoroscopic imaging apparatus 100 is an apparatus that uses X-rays to photograph a subject who is a human body. The X-ray fluoroscopic imaging apparatus 100 is configured to generate an image of the inside of the subject based on the photographing result of the subject obtained using X-rays.

[0025] The X-ray fluoroscopic imaging apparatus 100 includes an X-ray fluoroscopic imaging apparatus main body 1 (hereinafter, simply referred to as the "apparatus main body"), a control device 30, a display unit 40, and an operation console 50. The apparatus main body 1 and the control device 30 are connected in a communicable manner. The control device 30 is connected to the display unit 40 and the operation console 50.

[0026] (X-ray Fluoroscopic Imaging Apparatus Main Body)

[0027] As Figure 2 shown, the apparatus main body 1 includes a top plate 2, an X-ray irradiation unit 3, an X-ray detection unit 4, a collimator 5, a photographing control unit 6 (refer to Figure 1 ) and a top plate locking unit 7 (refer to Figure 1 ) as a photographing mechanism. The X-ray irradiation unit 3 and the X-ray detection unit 4 constitute a unit for photographing an X-ray image 41 (refer toFigure 6 )'s imaging unit 8.

[0028] The top plate 2 has a surface 2a for placing a subject (inspection object) to be photographed. Viewed from a direction substantially perpendicular to the surface 2a (the Z direction in Figure 2 ), the top plate 2 has a substantially rectangular shape. In Figure 2 , the top plate 2 is a substantially rectangular shape with the X direction as the long side and the Y direction as the short side.

[0029] The X-ray irradiation unit 3 generates X-rays when a high voltage is applied. The X-ray irradiation unit 3 is configured to irradiate the generated X-rays toward the X-ray detection unit 4. The X-ray irradiation unit 3 includes an X-ray tube that generates X-rays.

[0030] The collimator 5 is configured to adjust the irradiation field 42 (see Figure 6 ) of the X-rays generated by the X-ray tube. The collimator 5 is disposed in front of the emission direction of the X-rays. Inside the collimator 5, there are provided Figure 3 a first group of a plurality of shielding blades 10 provided on the X-ray tube side as shown in (a) of Figure 3 , and

[0031] as Figure 3 a second group of a plurality of shielding blades 15 provided on the top plate 2 side as shown in (b) of

[0032] The X-rays irradiated from the X-ray tube pass through the opening 5a formed by the first group of a plurality of shielding blades 10 and the second group of a plurality of shielding blades 15. In addition, the collimator 5 is an example of the "irradiation field adjustment unit" of the present disclosure. Figure 5

[0031] As Figure 3 shown in (a) of

[0032] , the first group of a plurality of shielding blades 10 includes a first shielding blade 11, a second shielding blade 12, a third shielding blade 13, and a fourth shielding blade 14. The first shielding blade 11 is disposed on the Y1 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the Y2 direction. The second shielding blade 12 is disposed on the Y2 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the Y1 direction. The third shielding blade 13 is disposed on the X1 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the X2 direction. The fourth shielding blade 14 is disposed on the X2 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the X1 direction.

[0032] The first shielding blade 11, the second shielding blade 12, the third shielding blade 13, and the fourth shielding blade 14 are configured to be able to move independently of each other. The first shielding blade 11, the second shielding blade 12, the third shielding blade 13, and the fourth shielding blade 14 are each configured to be able to move according to the first shielding blade operation unit 52 provided on the operation console 50 (see Figure 5) moves in response to the operation input. In addition, the first shielding blade 11 and the second shielding blade 12 are configured to be movable based on the operation input to the top plate operation unit 51 (see Figure 1 ) by the second control performed by the main control unit 31 (see Figure 5 ) in a state where the movement of the top plate 2 is prohibited by the top plate locking unit 7. In addition, the second control performed by the main control unit 31 will be described later.

[0033] As Figure 3 (b) of FIG. shows, the plurality of shielding blades 15 in the second group include a fifth shielding blade 16, a sixth shielding blade 17, a seventh shielding blade 18, and an eighth shielding blade 19. The fifth shielding blade 16 is disposed on the Y1 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the Y2 direction. The sixth shielding blade 17 is disposed on the Y2 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the Y1 direction. The fifth shielding blade 16 and the sixth shielding blade 17 are configured as a first pair of shielding blades 15a, and the first pair of shielding blades are symmetrically controlled so as to approach or separate from each other along the Y direction.

[0034] The seventh shielding blade 18 is disposed on the X1 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the X2 direction. The eighth shielding blade 19 is disposed on the X2 side inside the collimator 5 and is configured to be able to limit the irradiated X-rays by moving in the X1 direction. The seventh shielding blade 18 and the eighth shielding blade 19 are configured as a second pair of shielding blades 15b, and the second pair of shielding blades 15b are symmetrically controlled so as to approach or separate from each other along the X direction.

[0035] The first pair of shielding blades 15a formed by the fifth shielding blade 16 and the sixth shielding blade 17 and the second pair of shielding blades 15b formed by the seventh shielding blade 18 and the eighth shielding blade 19 are each configured to be movable in response to the operation input to the second shielding blade operation unit 53 (see Figure 5 ) provided on the operation console 50.

[0036] That is, the plurality of shielding blades 10 in the first group are configured to individually adjust the positions of the respective sides of the irradiation field 42. In addition, the plurality of shielding blades 15 in the second group are configured to adjust the width (left and right dimension) and the length (up and down dimension) of the irradiation field 42 without changing the central position of the irradiation field 42.

[0037] As Figure 2As shown, the X-ray detection unit 4 detects the X-rays that are irradiated by the X-ray irradiation unit 3 and pass through the subject. The X-ray detection unit 4 has, for example, an FPD (Flat Panel Detector). The X-ray detection unit 4 sends a detection signal, which is an electrical signal corresponding to the detected X-rays, to an X-ray image generation unit 32 (refer to Figure 1 ).

[0038] In the apparatus main body 1, the X-ray irradiation unit 3 is provided on the surface side of the top plate 2, and the X-ray detection unit 4 is provided on the back side of the top plate 2. The X-ray irradiation unit 3 and the X-ray detection unit 4 are arranged to face each other with the top plate 2 therebetween.

[0039] The imaging control unit 6 (refer to Figure 1 ) is configured to control the irradiation of X-rays of the apparatus main body 1. The imaging control unit 6 is composed of a control device of the X-ray irradiation unit 3 and the like. The imaging control unit 6 performs imaging start, imaging stop, etc. based on an instruction from the main control unit 31.

[0040] The apparatus main body 1 includes a base 20, a first column 21, a holding unit 22, and a second column 23 as a support mechanism. In addition, as Figure 4 shown, the apparatus main body 1 includes a holding unit moving mechanism 24, a top plate moving mechanism 25, an X-ray detection unit moving mechanism 26, and an X-ray irradiation unit moving mechanism 27 as moving mechanisms. In addition, the apparatus main body 1 includes a top plate rotation mechanism 28 and an X-ray irradiation unit rotation mechanism 29 as rotation mechanisms.

[0041] As Figure 2 shown, the first column 21 supports the entire apparatus main body 1. The first column 21 is provided on the base 20. A holding unit moving mechanism 24 (refer to Figure 4 ) is provided on the first column 21. The holding unit 22 is configured to be able to move the holding unit 22 in the Z direction by the holding unit moving mechanism 24.

[0042] The holding unit 22 holds the top plate 2, the second column 23, and the X-ray detection unit 4. A top plate moving mechanism 25 (refer to Figure 4 ), an X-ray detection unit moving mechanism 26 (refer to Figure 4 ), and a top plate rotation mechanism 28 (refer to Figure 4 ) are provided on the holding unit 22. The top plate 2 is configured to be able to move the top plate 2 in the short side direction of the top plate 2 (in Figure 2 it is the Y direction) by the top plate moving mechanism 25. The X-ray detection unit 4 is configured to be able to move the X-ray detection unit 4 in the long side direction of the top plate 2 (in Figure 2 it is the X direction) by the X-ray detection unit moving mechanism 26. In addition, Figure 2The XY direction therein is a substantially horizontal direction. The top plate 2 is configured to be rotatable about an axis 90 extending along the short side direction (Y direction) of the top plate 2 by a top plate rotation mechanism 28.

[0043] The second support column 23 supports the X-ray irradiation unit 3. An X-ray irradiation unit moving mechanism 27 (see Figure 4 ) and an X-ray irradiation unit rotation mechanism 29 (see Figure 4 ) are provided on the second support column 23. The X-ray irradiation unit 3 is configured to be movable along the long side direction of the top plate 2 (X direction in Figure 2 ) by the X-ray irradiation unit moving mechanism 27. Regarding the imaging unit 8 including the X-ray irradiation unit 3 and the X-ray detection unit 4, it can be synchronously operated by the X-ray irradiation unit moving mechanism 27 and the X-ray detection unit moving mechanism 26 so as to move integrally relative to the top plate 2. The X-ray irradiation unit 3 is configured to be rotatable about an axis 91 extending along the short side direction (Y direction) of the top plate 2 by the X-ray irradiation unit rotation mechanism 29.

[0044] The top plate locking portion 7 (see Figure 1 ) is configured to lock the top plate 2 in a non-movable state relative to the holding portion 22. The top plate locking portion 7 can switch between a locked state in which the top plate 2 cannot move relative to the holding portion 22 and an unlocked state in which the top plate 2 can move relative to the holding portion 22. The top plate locking portion 7 is configured, for example, to cancel the magnetic force of the permanent magnet by energizing the electromagnet, thereby weakening the restriction on the movement of the top plate 2 relative to the holding portion 22. That is, when the electromagnet is not energized, the movement of the top plate 2 relative to the holding portion 22 in the short side direction (Y direction in Figure 2 ) is restricted (locked). In addition, the top plate locking portion 7 can use a known structure capable of restricting the movement of the top plate 2 relative to the holding portion 22 in the short side direction, and the structure of the top plate locking portion 7 is not particularly limited.

[0045] (Control device, display unit, and operation console)

[0046] As Figure 1 shown, the control device 30 is constituted by a PC (personal computer), for example. The control device 30 includes a main control portion 31, an X-ray image generation portion 32, a storage portion 33, and an input / output portion 34. The control device 30 is connected to the display portion 40 and the operation console 50. In addition, the main control portion 31 is an example of the "control portion" of the present disclosure.

[0047] The main control unit 31 is constituted by a processor such as a CPU (Central Processing Unit), and controls the operation of the X-ray fluoroscopy apparatus 100 by executing an application program stored in the storage unit 33. This control includes the control of the movement of the top plate 2 and the control of the display of the X-ray image 41 on the display unit 40.

[0048] The main control unit 31 is configured to perform first control to move the top plate 2 based on an operation input to the top plate operation unit 51 (refer to Figure 5 ) in a state where the movement of the top plate 2 is not prohibited by the top plate locking unit 7, and is configured to perform, in a state where the movement of the top plate 2 is prohibited by the top plate locking unit 7, second control to move the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 without moving the top plate 2 based on an operation input to the top plate operation unit 51. Figure 2 ) based on an operation input to the top plate operation unit 51 without moving the top plate 2, and the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 (refer to Figure 6 ) is moved.

[0049] The X-ray image generation unit 32 is constituted by a processor such as a GPU (Graphics Processing Unit) or an FPGA (Field-Programmable Gate Array) configured to generate an X-ray image. The X-ray image generation unit 32 is configured to generate an X-ray image 41 based on a detection signal detected by the X-ray detection unit 4.

[0050] The storage unit 33 is configured to include a volatile storage device and a non-volatile storage device. The storage unit 33 stores application programs and the like.

[0051] The input / output unit 34 is constituted by various interfaces for inputting and outputting signals to and from the control device 30. The input / output unit 34 is connected to the display unit 40 and the operation console 50.

[0052] The display unit 40 is, for example, a liquid crystal display device or the like. The display unit 40 is configured to be able to display the X-ray image 41 generated by the X-ray image generation unit 32 and the like.

[0053] As Figure 5 shown, the operation console 50 includes a top plate operation unit 51, a first shielding blade operation unit 52, a second shielding blade operation unit 53, and an input unit 54.

[0054] The top plate operation unit 51 is, for example, a joystick. The top plate operation unit 51 is configured to be able to move in a first direction ( Figure 5 the right direction in Figure 5 ), a second direction ( Figure 5 the left direction inFigure 5 tilt downward) to perform direction input corresponding to the tilted direction. In addition, details of the first control for moving the top plate 2 and the second control for moving the center 42a of the irradiation field 42 of the X-ray image 41 (refer to Figure 6 ) based on the operation input to the top plate operation unit 51 are described later.

[0055] The first shielding blade operation unit 52 is configured to receive operation inputs for moving each of the shielding blades among the first shielding blade 11, the second shielding blade 12, the third shielding blade 13, and the fourth shielding blade 14. The first shielding blade operation unit 52 includes, for example, four slide buttons respectively corresponding to the first shielding blade 11, the second shielding blade 12, the third shielding blade 13, and the fourth shielding blade 14 and capable of moving in the front-rear direction ( Figure 5 the up-down direction in

[0056] The first shielding blade operation unit 52 includes a first slide button 52a, a second slide button 52b, a third slide button 52c, and a fourth slide button 52d. The first slide button 52a is configured to receive an operation input for moving the first shielding blade 11 in the Y2 direction to limit one side in the Y1 direction of the X-ray irradiation field 42, and to receive an operation input for moving the first shielding blade 11 in the Y1 direction to cancel the limitation. The second slide button 52b is configured to receive an operation input for moving the second shielding blade 12 in the Y1 direction to limit one side in the Y2 direction of the X-ray irradiation field 42, and to receive an operation input for moving the second shielding blade 12 in the Y2 direction to cancel the limitation. The third slide button 52c is configured to receive an operation input for moving the third shielding blade 13 in the X2 direction to limit one side in the X1 direction of the X-ray irradiation field 42, and to receive an operation input for moving the third shielding blade 13 in the X1 direction to cancel the limitation. The fourth slide button 52d is configured to receive an operation input for moving the fourth shielding blade 14 in the X1 direction to limit one side in the X2 direction of the X-ray irradiation field 42, and to receive an operation input for moving the fourth shielding blade 14 in the X2 direction to cancel the limitation.

[0057] The second shielding blade operation unit 53 is configured to receive operation inputs for moving the first pair of shielding blades 15a composed of the fifth shielding blade 16 and the sixth shielding blade 17 and the second pair of shielding blades 15b composed of the seventh shielding blade 18 and the eighth shielding blade 19. The second shielding blade operation unit 53 includes, for example, two slide buttons respectively corresponding to the first pair of shielding blades 15a and the second pair of shielding blades 15b and capable of moving in the front-rear direction ( Figure 5 the up-down direction in

[0058] The second shielding blade operating unit 53 includes a fifth sliding button 53a and a sixth sliding button 53b. The fifth sliding button 53a is configured to receive an operation input for moving the first pair of shielding blades 15a closer to each other along the Y direction to limit the two sides of the X-ray irradiation field 42 in the Y direction, and to receive an operation input for moving the first pair of shielding blades 15a away from each other along the Y direction to release the limitation. The sixth sliding button 53b is configured to receive an operation input for moving the second pair of shielding blades 15b closer to each other along the X direction to limit the two sides of the X-ray irradiation field 42 in the X direction, and to receive an operation input for moving the second pair of shielding blades 15b away from each other along the X direction to release the limitation.

[0059] The input unit 54 is, for example, a touch panel. The input unit 54 is configured to receive input operations performed by an operator or a technician for operating the X-ray fluoroscopy apparatus 100. For example, the input unit 54 is configured to receive operation inputs regarding locking and unlocking of the top plate 2 movement in the Y direction by the top plate locking unit 7.

[0060] (First control and second control)

[0061] Main control unit 31 (see Figure 1 ) is configured to perform the first control in a state where the movement of the top plate 2 is not prohibited by the top plate locking unit 7. The main control unit 31 is configured to perform the first control based on, for example, receiving an operation input to release the lock of the top plate 2 made to the input unit 54. In the first control, the main control unit 31 moves the top plate 2 or the imaging unit 8 including the X-ray irradiation unit 3 and the X-ray detection unit 4 based on the operation input to the top plate operating unit 51.

[0062] Main control unit 31 (see Figure 1 ) In the first control, the first direction of the top plate operating unit 51 is aligned with the Y1 direction (refer to Figure 2 ). In the first control, when the top operating unit 51 is tilted in the first direction, the main control unit 31 moves the top plate 2 in the Y1 direction. At this time, when the X-ray image 41 is displayed on the display unit 40, the X-ray image 41 is scrolled in the Y1 direction on the display unit 40. In addition, in the first control, the main control unit 31 compares the second direction at the top operating unit 51 with the Y2 direction (refer to Figure 2 ). In the first control, when the top operating unit 51 is tilted in the second direction, the main control unit 31 moves the top 2 in the Y2 direction. At this time, when the X-ray image 41 is displayed on the display unit 40, the X-ray image 41 is scrolled in the Y2 direction on the display unit 40.

[0063] Main control unit 31 (seeFigure 1 )In the first control, the third direction at the top plate operation unit 51 corresponds to the X1 direction which is the moving direction of the imaging unit 8 (refer to Figure 2 ). In the first control, when the top plate operation unit 51 is tilted in the third direction, the main control unit 31 moves the imaging unit 8 in the X1 direction. Further, in the first control, the main control unit 31 makes the fourth direction at the top plate operation unit 51 correspond to the X2 direction which is the moving direction of the imaging unit 8 (refer to Figure 2 ). In the first control, when the top plate operation unit 51 is tilted in the fourth direction, the main control unit 31 moves the imaging unit 8 in the X2 direction.

[0064] Further, the main control unit 31 (refer to Figure 1 ) is configured to perform the second control in a state where the movement of the top plate 2 is prohibited by the top plate locking unit 7. For example, the main control unit 31 is configured to perform the second control based on receiving an operation input for locking the top plate 2 to the input unit 54. In the second control, based on the operation input to the top plate operation unit 51, the main control unit 31 moves the first shielding blade 11, the second shielding blade 12, or the imaging unit 8 without moving the top plate 2.

[0065] The main control unit 31 (refer to Figure 1 ) makes the first direction at the top plate operation unit 51 correspond to the Y2 direction which is the moving direction of the first shielding blade 11 (refer to Figure 3 (a)) in the second control. In the second control, when the top plate operation unit 51 is tilted in the first direction, the main control unit 31 moves the first shielding blade 11 in the Y2 direction. Thus, the main control unit 31 performs control to move the first shielding blade 11 to adjust the irradiation field 42, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in the second direction (Y2 direction), and this second direction is the direction opposite to the first direction in the operation input to the top plate operation unit 51. Further, in the second control, when the first shielding blade 11 has already moved in the Y2 direction, the main control unit 31 makes the second direction at the top plate operation unit 51 correspond to the Y1 direction which is the moving direction of the first shielding blade 11 (refer to Figure 3 (a)). In the second control, when the first shielding blade 11 has already moved in the Y2 direction and the top plate operation unit 51 is tilted in the second direction, the main control unit 31 moves the first shielding blade 11 in the Y1 direction.

[0066] Further, the main control unit 31 (refer to Figure 1 ) makes the second direction at the top plate operation unit 51 correspond to the Y1 direction which is the moving direction of the second shielding blade 12 (refer to Figure 3corresponds to (a) of). In the second control, when the top plate operation unit 51 is tilted in the second direction, the main control unit 31 moves the second shielding blade 12 in the Y1 direction. Thus, the main control unit 31 performs control to move the second shielding blade 12 to adjust the irradiation field 42, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in the first direction (Y1 direction), which is the direction opposite to the second direction in the operation input to the top plate operation unit 51. Further, in the second control, when the second shielding blade 12 has already moved in the Y1 direction, the main control unit 31 sets the first direction at the top plate operation unit 51 and the Y2 direction (refer to Figure 3 corresponds to (a) of). In the second control, when the second shielding blade 12 has moved in the Y1 direction and the top plate operation unit 51 is tilted in the first direction, the main control unit 31 moves the second shielding blade 12 in the Y2 direction.

[0067] Further, the main control unit 31 (refer to Figure 1 ) is configured to: in the second control, correspondingly to the movement amount of the first shielding blade 11 or the second shielding blade 12 in the Y direction, move the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in the direction opposite to the movement direction in the operation input to the top plate operation unit 51.

[0068] Further, the main control unit 31 (refer to Figure 1 ) is configured to: in the second control, when the top plate operation unit 51 is tilted in one of the first direction and the second direction, only move one of the first shielding blade 11 and the second shielding blade 12.

[0069] Further, the main control unit 31 (refer to Figure 1 ) in the second control corresponds the third direction at the top plate operation unit 51 to the X1 direction (refer to Figure 2 ) which is the movement direction of the imaging unit 8 in the same manner as in the first control. In the first control, when the top plate operation unit 51 is tilted in the third direction, the main control unit 31 moves the imaging unit 8 in the X1 direction. Further, the main control unit 31 in the second control corresponds the fourth direction at the top plate operation unit 51 to the X2 direction (refer to Figure 2 ) which is the movement direction of the imaging unit 8 in the same manner as in the first control. In the first control, when the top plate operation unit 51 is tilted in the fourth direction, the main control unit 31 moves the imaging unit 8 in the X2 direction.

[0070] (Centering process of X-ray image in second control)

[0071] The main control unit 31 (refer to Figure 1)It is configured such that in the second control, when moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40, as shown in (c) of Figure 6 , centering processing is performed to align the center 42a of the irradiation field 42 of the X-ray image 41 with the center 40a of the display unit 40 by moving the X-ray image 41 in the Y direction. In addition, the irradiation field 42 refers to the irradiation range of the X-ray that is not blocked by the shielding blades.

[0072] As shown in (b) of Figure 6 , the main control unit 31 (refer to Figure 1 ) in the second control, when the top plate operation unit 51 is tilted in the first direction, moves the first shielding blade 11 in the Y2 direction. As a result, the irradiation field 42 restricted by the first shielding blade 11 is displayed in the Y2 direction in the display unit 40. As shown in (c) of Figure 6 , the main control unit 31 is configured to perform control to align the center 42a of the irradiation field 42 of the X-ray image 41 with the center 40a of the display unit 40 by moving the X-ray image 41 in the Y1 direction, thereby making the irradiation field 42 displayed in the Y2 direction in the display unit 40 be displayed at approximately the center in the Y direction in the display unit 40. In addition, in the Figure 6 , the blackened area at the left end of the display unit 40 in (c) is the area where the X-ray image 41 is not displayed.

[0073] In addition, in the second control, when the top plate operation unit 51 is tilted in the second direction, the main control unit 31 (refer to Figure 1 ) is configured to make the irradiation field 42 displayed in the Y1 direction in the display unit 40 be displayed at approximately the center in the Y direction in the display unit 40.

[0074] (Magnification and reduction processing of the X-ray image in the second control)

[0075] The main control unit 31 (refer to Figure 1 ) is configured to perform magnification and reduction processing to magnify or reduce the image of the adjusted irradiation field 42 while maintaining the aspect ratio of the X-ray image 41 as shown in (d) of Figure 6 in the second control.

[0076] The main control unit 31 is configured such that when the second pair of shielding blades 15b move closer to each other along the X direction as shown by the arrow in (c) of Figure 6 due to the operation input of the sixth slide button 53b of the second shielding blade operation unit 53 by the operator or technician, thereby restricting the two sides of the irradiation field 42 in the X direction, as shown in Figure 6While maintaining the ratio of the X direction to the Y direction of the X-ray image 41 as shown in (d) thereof, the sizes in the X direction and the Y direction of the adjusted irradiation field 42 are enlarged so that the size in the X direction of the irradiation field 42 with both sides in the X direction restricted is made to coincide with the vertical screen size of the display unit 40.

[0077] That is, the main control unit 31 enlarges the sizes in the X direction and the Y direction of the irradiation field 42 while maintaining the ratio of the X direction to the Y direction of the X-ray image 41 so that both sides in the X direction of the irradiation field 42 with both sides in the X direction restricted are aligned with both sides in the vertical direction of the display unit 40. Here, the "screen size of the display unit 40" refers to the size of the display area including the X-ray image 41 for full-screen display in the display unit 40.

[0078] In addition, when the ratio of the X direction to the Y direction of the restricted irradiation field 42 does not match the aspect ratio of the screen size, it can be set to prioritize making the size in the X direction of the irradiation field 42 coincide with the vertical screen size of the display unit 40, or it can be set to prioritize making the size in the Y direction of the irradiation field 42 coincide with the horizontal screen size of the display unit 40.

[0079] In addition, for example, the main control unit 31 (refer to Figure 1 ) is configured such that in the second control, when the first shielding blade 11 has moved in the Y2 direction and the top plate operation unit 51 has tilted in the second direction, and the second pair of shielding blades 15b have moved apart from each other by an operation input by the operator or technician to the sixth slide button 53b of the second shielding blade operation unit 53 to release the restriction, while maintaining the ratio of the X direction to the Y direction of the X-ray image 41, the sizes in the X direction and the Y direction of the adjusted irradiation field 42 are reduced so that the size in the X direction of the irradiation field 42 after the restriction is released coincides with the vertical screen size of the display unit 40. That is, the main control unit 31 reduces the sizes in the X direction and the Y direction of the irradiation field 42 while maintaining the ratio of the X direction to the Y direction of the X-ray image 41 so that both sides in the X direction of the irradiation field 42 with both sides in the X direction restricted are aligned with both sides in the vertical direction of the display unit 40.

[0080] (Operation input to the top plate operation unit and display of the X-ray image in the second control)

[0081] Refer to Figure 6 's (a) to Figure 6 's (d) to describe the operation input to the top plate operation unit 51 and the display of the X-ray image 41 in the second control. Next, the display of the X-ray image 41 in the display unit 40 based on the operation input by tilting the top plate operation unit 51 in the first direction in the second control, which is an example of the present embodiment, will be described.

[0082] As shown in Figure 6 (a) thereof, with the movement of the top plate 2 prohibited by the top plate locking portion 7, an X-ray image 41 is displayed on the display unit 40. At this time, the top plate operation unit 51 does not tilt in any of the first to fourth directions. None of the first shielding blades 11 to fourth shielding blades 14 and the fifth shielding blades 16 to eighth shielding blades 19 move to limit the irradiated X-rays. Figure 6 The imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 as shown in (a) thereof is substantially the same as the detection range of the FPD of the X-ray detection unit 4.

[0083] Then, the top plate operation unit 51 tilts in the first direction, thereby performing an operation input in the first direction on the top plate operation unit 51. The main control unit 31 performs control to move the first shielding blade 11 in the second direction to adjust the irradiation field 42 based on the operation input in the first direction on the top plate operation unit 51. As a result, an X-ray shielding region corresponding to the first shielding blade 11 is formed at the right end of the display unit 40, and the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 moves in the second direction. That is, as shown in Figure 6 (b) thereof, the irradiation field 42 limited by the first shielding blade 11 is displayed on the display unit 40 biased in the Y2 direction.

[0084] Then, as shown in Figure 6 (c) thereof, the main control unit 31 performs control to move the X-ray image 41 in the Y1 direction so that the center 42a of the irradiation field 42 of the X-ray image 41 is aligned with the center 40a of the display unit 40, thereby causing the irradiation field 42 displayed on the display unit 40 biased in the Y2 direction to be displayed at approximately the center in the Y direction in the display unit 40.

[0085] Based on the operation input in the first direction on the top plate operation unit 51, the irradiation field 42 displayed on the display unit 40 biased in the Y2 direction is displayed at approximately the center in the Y direction in the display unit 40, whereby the adjusted irradiation field 42 in the display unit 40 moves in the Y1 direction.

[0086] Here, in the first control, when an input is made to the top plate operation unit 51 in the first direction, the top plate 2 moves in the Y1 direction, and in the X-ray image 41 of the display unit 40, the subject moves to the left. Further, in the second control, when an input is made to the top plate operation unit 51 in the first direction, the top plate 2 does not move, but as if the top plate 2 moves to the left in the same manner as in the first control, the right end portion of the X-ray image 41 is cut off, and the entire X-ray image including the subject moves to the left. That is, the scrolling direction of the operation of the top plate operation unit 51 in the first control in the display unit 40 is the same as the scrolling direction of the operation of the top plate operation unit 51 in the second control in the display unit 40. Therefore, based on the operation input in the first direction to the top plate operation unit 51, the operator and the technician can visually confirm in the display unit 40 as if the top plate 2 that is prohibited from moving moves in the Y1 direction.

[0087] Further, based on the operation input to the sixth slide button 53b of the second shielding blade operation unit 53, both side limits in the X direction of the irradiation field 42 are restricted, and the main control unit 31 Figure 6 as shown in (d) thereof, while maintaining the ratio of the X direction to the Y direction of the X-ray image 41, enlarges the sizes in the X direction and the Y direction of the adjusted irradiation field 42 so that the size in the X direction of the irradiation field 42 with both sides restricted in the X direction is the same as the vertical screen size of the display unit 40. Through the above, the second control by the main control unit 31 based on the operation input in the first direction to the top plate operation unit 51 is completed.

[0088] In addition, it is also possible to return from Figure 6 the display of the X-ray image 41 shown in (d) of Figure 6 the display unit 40 to the display of the X-ray image 41 shown in (a) of Figure 6 the display unit 40 by executing the above operations and control procedures in reverse. Further, it is also possible to further execute the above operations and control starting from the display of the X-ray image 41 shown in (d) of Figure 6 the display unit 40, so that after the center 42a of the irradiation field 42 of the X-ray image 41 shown in (d) of

[0089] the display unit 40 moves further in the Y2 direction, the center 42a of the irradiation field 42 of the X-ray image 41 is aligned with the center 40a of the display unit 40, and the size of the adjusted irradiation field 42 is further enlarged.

[0090] That is, in a state where the top plate operation unit 51 is not tilted and the first shielding blade 11 to the eighth shielding blade 19 do not move, the top plate operation unit 51 is tilted in the second direction, thereby performing an operation input in the second direction on the top plate operation unit 51. The main control unit 31 performs control to move the second shielding blade 12 in the first direction to adjust the irradiation field 42 based on the operation input in the second direction on the top plate operation unit 51. As a result, the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 moves in the first direction. Then, the main control unit 31 performs control to align the center 42a of the irradiation field 42 of the X-ray image 41 with the center 40a of the display unit 40, thereby causing the irradiation field 42 displayed deviated in the Y1 direction in the display unit 40 to be displayed at approximately the center in the Y direction in the display unit 40.

[0091] Based on the operation input in the second direction on the top plate operation unit 51, the irradiation field 42 displayed deviated in the Y1 direction in the display unit 40 is caused to be displayed at approximately the center in the Y direction in the display unit 40, whereby the adjusted irradiation field 42 in the display unit 40 moves in the Y2 direction. Therefore, based on the operation input in the second direction on the top plate operation unit 51, the operator and the technician can visually confirm in the display unit 40 as if the top plate 2 whose movement is prohibited moves in the Y2 direction.

[0092] (Movement control process and display control process performed by the main control unit)

[0093] Refer to Figure 7 to describe the movement control process and display control process performed by the main control unit 31 in the present embodiment. In addition, as long as the order of the processing steps does not conflict with each other, the front and back can be swapped or executed simultaneously.

[0094] In step S1, the main control unit 31 determines whether the movement of the top plate 2 is prohibited by the top plate locking unit 7. When the main control unit 31 determines that the movement of the top plate 2 is prohibited by the top plate locking unit 7 (Yes in step S1), the process proceeds to step S2. When the main control unit 31 determines that the movement of the top plate 2 is not prohibited by the top plate locking unit 7 (No in step S1), the process proceeds to step S3.

[0095] In step S2, the main control unit 31 performs second control based on the operation input on the top plate operation unit 51. Specifically, the main control unit 31 performs the following processing: Based on the operation input on the top plate operation unit 51, without moving the top plate 2, the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 is moved. After that, the process proceeds to step S4.

[0096] In step S3, the main control unit 31 performs the first control based on the operation input to the top plate operation unit 51. Specifically, the main control unit 31 performs a process of moving the top plate 2 based on the operation input to the top plate operation unit 51. Thereafter, the process ends.

[0097] In step S4, the main control unit 31 determines whether an operation input in the first direction or the second direction is obtained for the top plate operation unit 51. When the main control unit 31 obtains the operation input in the first direction or the second direction for the top plate operation unit 51 ("Yes" in step S4), the processing proceeds to step S5. When the main control unit 31 determines that the operation input in the first direction or the second direction for the top plate operation unit 51 is not obtained ("No" in step S4), the processing proceeds to step S4.

[0098] In step S5, the main control unit 31 controls the irradiation field 42 through the collimator 5 to move the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in the direction opposite to the moving direction in the operation input to the top plate operation unit 51. Thereafter, the process proceeds to step S6.

[0099] In step S6, the main control unit 31 moves the X-ray image 41 in the Y direction to align the center 42a of the irradiation field 42 of the X-ray image 41 with the center 40a of the display unit 40. Thereafter, the process proceeds to step S7.

[0100] In step S7, the main control unit 31 determines whether the operation input of the sixth slide button 53b for the second pair of shielding blades 15b is obtained. When the main control unit 31 obtains the operation input of the sixth slide button 53b for the second pair of shielding blades 15b ("Yes" in step S7), the processing proceeds to step S8. When the main control unit 31 determines that the operation input of the sixth slide button 53b for the second pair of shielding blades 15b is not obtained ("No" in step S7), the processing ends.

[0101] In step S8, the main control unit 31 determines whether the acquired operation input of the sixth slide button 53b is an operation input for moving the second pair of shielding blades 15b so as to approach each other along the X direction to limit the two sides of the X-ray irradiation field 42 in the X direction. If the main control unit 31 determines that it is an operation input for limiting the two sides of the X-ray irradiation field 42 in the X direction ("Yes" in step S8), the processing proceeds to step S9. If the main control unit 31 determines that it is not an operation input for limiting the two sides of the X-ray irradiation field 42 in the X direction, but an operation input for moving the two sides of the X-ray irradiation field 42 in the X direction away from each other to release the limitation ("No" in step S8), the processing proceeds to step S10.

[0102] In step S9, the main control unit 31 enlarges the size of the adjusted irradiation field 42 so that the size of the irradiation field 42 with both sides in the X direction restricted is the same as the vertical screen size of the display unit 40. After that, the process ends.

[0103] In step S10, the main control unit 31 reduces the size of the adjusted irradiation field 42 so that the size of the irradiation field 42 after the restriction is released in the X direction is the same as the vertical screen size of the display unit 40. After that, the process ends.

[0104] In step S11, the main control unit 31 determines whether an operation input to the top plate operation unit 51 in the first direction or the second direction is obtained. When the main control unit 31 obtains an operation input to the top plate operation unit 51 in the first direction or the second direction (being "Yes" in step S11), the process proceeds to step S12. When the main control unit 31 determines that an operation input to the top plate operation unit 51 in the first direction or the second direction is not obtained (being "No" in step S11), the process proceeds to step S11.

[0105] In step S12, the main control unit 31 moves the top plate 2 in the moving direction in the operation input to the top plate operation unit 51. After that, the process ends.

[0106] (Effect of this embodiment)

[0107] In this embodiment, the following effects can be obtained.

[0108] In the present embodiment, as described above, it includes: an imaging unit 8 including an X-ray irradiation unit 3 that irradiates an X-ray to a subject and an X-ray detection unit 4 that detects the X-ray irradiated by the X-ray irradiation unit 3; an X-ray image generation unit 32 that generates an X-ray image 41 based on a detection signal detected by the X-ray detection unit 4; a top plate 2 that is disposed between the X-ray irradiation unit 3 and the X-ray detection unit 4, on which the subject can be placed and which can move in the horizontal direction; a top plate moving mechanism 25 that moves the top plate 2; a top plate operation unit 51 that accepts an operation input for moving the top plate 2; a top plate locking unit 7 that prohibits the movement of the top plate 2; a display unit 40 that displays the X-ray image 41 generated by the X-ray image generation unit 32; and a main control unit 31 that controls the movement of the top plate 2 and controls the display unit 40 to display the X-ray image 41. Among them, the main control unit 31 is configured such that in a first control when the movement of the top plate 2 is not prohibited by the top plate locking unit 7, based on the operation input to the top plate operation unit 51, the top plate 2 is moved. The main control unit 31 is configured such that in a second control when the movement of the top plate 2 is prohibited by the top plate locking unit 7, based on the operation input to the top plate operation unit 51, a second control is performed to move the center 42a of the irradiation field 42 of the X-ray in the X-ray image 41 in the display unit 40 without moving the top plate 2. Thus, even when the movement of the top plate 2 is prohibited, it is possible to continue using the top plate operation unit 51 that is used to move the top plate 2 when the movement of the top plate 2 is not prohibited, and at the same time move the center 42a of the irradiation field 42 of the X-ray in the X-ray image 41 in the display unit 40. Therefore, even when the movement of the top plate 2 is prohibited during treatment, examination, etc., it is possible to adjust the center position of the irradiation field 42 of the X-ray and enable the above adjustment to be intuitively achieved for the operator and the technician.

[0109] In addition, in the above embodiment, by being configured as follows, the following further effects are obtained.

[0110] That is, in the present embodiment, as described above, the main control unit 31 is configured such that in the second control, the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 is moved in a direction opposite to the moving direction in the operation input to the top plate operation unit 51. Thus, it is possible to make the moving direction in the operation input to the top plate operation unit 51 coincide with the moving direction of the irradiation field 42 of the X-ray image 41, and therefore it is possible to operate more intuitively using the top plate operation unit 51.

[0111] In addition, in the present embodiment, as described above, a collimator 5 (irradiation field adjustment unit) for adjusting the irradiation field 42 of the X-ray is further provided. The main control unit 31 is configured to perform control for adjusting the irradiation field 42 by the collimator 5 based on an operation input to the top plate operation unit 51 in the second control, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40. Thus, by performing adjustment to limit the irradiation field 42, an area that does not require visual confirmation is excluded from the imaging range, so that the irradiation field of the X-ray can be reduced, and thus the radiation dose of the X-ray to the subject can be reduced.

[0112] In addition, in the present embodiment, as described above, the main control unit 31 is configured to align the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 with the center 40a of the display unit 40 when moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in the second control. Thus, based on the moving direction in the operation input to the top plate operation unit 51, it is possible to visually confirm in the display unit 40 as if the top plate 2 that is prohibited from moving moves in the same direction as the above-mentioned moving direction. Therefore, the operation can be performed more intuitively using the top plate operation unit 51, and the visual confirmation of the area of concern in the X-ray image 41 can be improved.

[0113] In addition, in the present embodiment, as described above, the collimator 5 includes shielding blades that adjust the irradiation field 42 by moving in a predetermined direction. The main control unit 31 is configured to move the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in a direction opposite to the moving direction in the operation input to the top plate operation unit 51 by moving the shielding blades. By moving the shielding blades, it is possible to visually confirm in the display unit 40 as if the top plate 2 that is prohibited from moving moves, so that the operation can be performed even more intuitively using the top plate operation unit 51.

[0114] In addition, in the present embodiment, as described above, the main control unit 31 is configured to move the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in a direction opposite to the moving direction in the operation input to the top plate operation unit 51 in accordance with the moving amount of the shielding blades in the second control. Thus, the main control unit 31 can appropriately move the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in accordance with the moving amount of the shielding blades by associating the operation input amount to the top plate operation unit 51 with the moving amount of the shielding blades.

[0115] In addition, in the present embodiment, as described above, the shielding blades include: a first shielding blade 11 that limits the irradiation field 42 from a first direction toward a second direction opposite to the first direction; and a second shielding blade 12 that moves independently of the first shielding blade 11 and limits the irradiation field 42 from the second direction toward the first direction. The main control unit 31 is configured such that, in the second control, based on an operation input in the first direction to the top plate operation unit 51, it moves the first shielding blade 11 or the second shielding blade 12 in the second direction to adjust the irradiation field 42, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in the second direction. The main control unit 31 is configured such that, in the second control, based on an operation input in the second direction to the top plate operation unit 51, it moves the first shielding blade 11 or the second shielding blade 12 in the first direction to adjust the irradiation field 42, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in the first direction. By moving the first shielding blade 11 or the second shielding blade 12 to adjust the irradiation field 42, it is possible to make the moving direction in the operation input to the top plate operation unit 51 coincide with the moving direction of the irradiation field 42 of the X-ray image 41. Therefore, the top plate operation unit 51 can be used for more intuitive operation.

[0116] In addition, in the present embodiment, as described above, the main control unit 31 is configured to move only one of the first shielding blade 11 and the second shielding blade 12 in the second control. Thus, by moving only one of the first shielding blade 11 and the second shielding blade 12 and moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40, it is possible to visually confirm in the display unit 40 as if the top plate 2 that is prohibited from moving is moving. Therefore, the top plate operation unit 51 can be used for more intuitive operation.

[0117] [Modification Example]

[0118] Furthermore, the embodiments disclosed this time should be considered illustrative in all aspects and not restrictive. The scope of the present invention is not represented by the description of the above embodiments, but by the claims, and also includes all changes (modification examples) within the meaning and scope equivalent to the claims.

[0119] For example, in the above embodiment, an example is shown in which the main control unit 31 performs control to adjust the irradiation field 42 by the shielding blades based on the operation input to the top plate operation unit 51 in the second control, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40. However, the present invention is not limited to this. In the present invention, instead of performing control to adjust the irradiation field 42 by the shielding blades, the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 may be moved by sliding (shifting) the X-ray image 41 in the display unit 40 in the Y direction.

[0120] In addition, in the above-described embodiment, an example is shown in which the imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 is substantially the same as the detection range of the FPD included in the X-ray detection unit 4. However, the present invention is not limited thereto. In the present invention, the imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 may be smaller than the detection range of the FPD included in the X-ray detection unit 4, and there is no particular limitation. For example, the imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 may be 70% of the detection range of the FPD included in the X-ray detection unit 4, or may be 90% of the detection range.

[0121] For example, the operation input to the top plate operation unit 51 and the display of the X-ray image 41 in the second control will be described in the case where the imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 is 70% of the detection range of the FPD included in the X-ray detection unit 4. Next, the display of the X-ray image 41 in the display unit 40 based on the operation input performed by tilting the top plate operation unit 51 in the first direction in the second control, which is an example of a modified example, will be described.

[0122] In the case where the imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 is 70% of the detection range of the FPD included in the X-ray detection unit 4, an X-ray shielding region corresponding to the first shielding blade 11 with a quantity of 15% is formed at the right end of the display unit 40, and an X-ray shielding region corresponding to the second shielding blade 12 with a quantity of 15% is formed at the left end of the display unit 40.

[0123] The top plate operation unit 51 is tilted in the first direction, whereby an operation input in the first direction is performed on the top plate operation unit 51. The main control unit 31 performs control to move the first shielding blade 11 in the second direction and also move the second shielding blade 12 in the second direction based on the operation input in the first direction to the top plate operation unit 51. That is, control is performed to move the first shielding blade 11 and the second shielding blade 12 in the second direction until the X-ray shielding region corresponding to the second shielding blade 12 with a quantity of 15% at the left end of the display unit 40 disappears. Therefore, the X-ray shielding region with a quantity of 15% at the left end of the display unit 40 can be visually confirmed. After that, control is performed to move only the first shielding blade 11 in the second direction. In the display unit 40, the irradiation field 42 that is restricted by the first shielding blade 11 and expanded by the second shielding blade 12 is displayed shifted in the Y2 direction.

[0124] Further, the main control unit 31 performs control to align the center 42a of the irradiation field 42 of the X-ray image 41 with the center 40a of the display unit 40, whereby the irradiation field 42 that is displayed while being biased in the Y2 direction in the display unit 40 is displayed at approximately the center in the Y direction in the display unit 40. Based on the operation input in the first direction to the top plate operation unit 51, the irradiation field 42 that is displayed while being biased in the Y2 direction in the display unit 40 is displayed at approximately the center in the Y direction in the display unit 40, whereby the adjusted irradiation field 42 in the display unit 40 moves in the Y1 direction. Therefore, based on the operation input in the first direction to the top plate operation unit 51, the operator and the technician can visually confirm in the display unit 40 as if the top plate 2 that is prohibited from moving moves in the Y1 direction.

[0125] In addition, in the above-described embodiment, an example is shown in which the operation input for locking and unlocking the movement of the top plate 2 in the Y direction by the top plate locking unit 7 is accepted by the input unit 54, but the present invention is not limited thereto. In the present invention, it may also be configured such that, based on the operation input for starting treatment of the treatment device and the operation input for starting inspection of the inspection device, the movement of the top plate 2 in the Y direction is prohibited by the top plate locking unit 7, and the main control unit 31 performs second control based on the operation input to the top plate operation unit 51.

[0126] In addition, in the above-described embodiment, an example is shown in which the top plate operation unit 51 is a joystick, but the present invention is not limited thereto. In the present invention, the top plate operation unit 51 may also be constituted by a component different from a joystick, such as a remote control lever or an operation panel having a plurality of operation buttons.

[0127] In addition, in the above-described embodiment, an example is shown in which the first shielding blade operation unit 52 and the second shielding blade operation unit 53 are constituted by slide buttons that can move in the front-rear direction, but the present invention is not limited thereto. The first shielding blade operation unit 52 and the second shielding blade operation unit 53 may also be constituted by an operation panel having a plurality of operation buttons or the like.

[0128] In addition, in the above-described embodiment, an example is shown in which the collimator 5 is configured to include the first shielding blade 11 to the eighth shielding blade 19, but the present invention is not limited thereto. The number of shielding blades included in the collimator 5 and the independent / symmetrical movement are not particularly limited.

[0129] In addition, in the above-described embodiment, an example is shown in which the main control unit 31 is configured to align the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 with the center 40a of the display unit 40 when moving the center 42a of the irradiation field 42 of the X-ray image 41 in the second control. However, the present invention is not limited thereto. In the present invention, when moving the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40, the center 42a of the irradiation field 42 of the X-ray image 41 may not be aligned with the center 40a of the display unit 40.

[0130] In addition, in the above-described embodiment, an example is shown in which the main control unit 31 enlarges or reduces the size of the adjusted irradiation field 42 so that the screen size of the display unit 40 coincides with the size of the adjusted irradiation field 42 when the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 is moved in the second control. However, the present invention is not limited thereto. In the present invention, the size of the adjusted irradiation field 42 may not be enlarged or reduced so that the screen size of the display unit 40 coincides with the size of the adjusted irradiation field 42.

[0131] In addition, in the above-described embodiment, an example is shown in which the main control unit 31 moves the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 in accordance with the movement amount of the shielding blades in the second control. However, the present invention is not limited thereto. In the present invention, the center 42a of the irradiation field 42 of the X-ray image 41 in the display unit 40 may be moved by a preset specified amount.

[0132] [Aspect]

[0133] Those skilled in the art will understand that the above exemplary embodiments are specific examples of the following aspects.

[0134] (Item 1)

[0135] An X-ray fluoroscopic imaging apparatus, comprising:

[0136] An imaging unit including an X-ray irradiation unit that irradiates an object to be examined with X-rays and an X-ray detection unit that detects the X-rays irradiated by the X-ray irradiation unit;

[0137] An X-ray image generation unit that generates an X-ray image based on a detection signal detected by the X-ray detection unit;

[0138] A top plate disposed between the X-ray irradiation unit and the X-ray detection unit, capable of placing the object to be examined thereon and moving in a horizontal direction;

[0139] A top plate moving mechanism that moves the top plate;

[0140] A top plate operation unit that receives an operation input for moving the top plate;

[0141] A top plate locking unit that prohibits the movement of the top plate;

[0142] A display unit that displays the X-ray image generated by the X-ray image generation unit; and

[0143] A control unit that controls the movement of the top plate and controls the display unit to display the X-ray image,

[0144] wherein, in a first control when the movement of the top plate is not prohibited by the top plate locking unit, the control unit moves the top plate based on an operation input to the top plate operation unit,

[0145] In a second control when the movement of the top plate is prohibited by the top plate locking unit, the control unit moves the center of the X-ray irradiation field of the X-ray image in the display unit without moving the top plate based on an operation input to the top plate operation unit.

[0146] (Item 2)

[0147] The X-ray fluoroscopic imaging apparatus according to Item 1, wherein

[0148] In the second control, the control unit moves the center of the X-ray irradiation field of the X-ray image in the display unit in a direction opposite to the moving direction in the operation input to the top plate operation unit.

[0149] (Item 3)

[0150] The X-ray fluoroscopic imaging apparatus according to Item 2, wherein

[0151] It further includes an irradiation field adjustment unit that adjusts the X-ray irradiation field,

[0152] In the second control, the control unit controls the irradiation field adjustment unit to adjust the irradiation field based on an operation input to the top plate operation unit, thereby moving the center of the X-ray irradiation field of the X-ray image in the display unit.

[0153] (Item 4)

[0154] The X-ray fluoroscopic imaging apparatus according to Item 3, wherein

[0155] In the second control, when moving the center of the X-ray irradiation field of the X-ray image in the display unit, the control unit aligns the center of the X-ray irradiation field of the X-ray image with the center of the display unit.

[0156] (Item 5)

[0157] The X-ray fluoroscopic imaging apparatus according to Item 3, wherein,

[0158] the irradiation field adjusting unit includes shielding blades that adjust the irradiation field by moving in a specified direction,

[0159] the control unit is configured such that, in the second control, by moving the shielding blades, the center of the irradiation field of the X-ray image in the display unit is moved in a direction opposite to the moving direction in the operation input to the top plate operation unit.

[0160] (Item 6)

[0161] The X-ray fluoroscopic imaging apparatus according to Item 5, wherein,

[0162] the control unit is configured such that, in the second control, corresponding to the moving amount of the shielding blades, the center of the irradiation field of the X-ray image in the display unit is moved in a direction opposite to the moving direction in the operation input to the top plate operation unit.

[0163] (Item 7)

[0164] The X-ray fluoroscopic imaging apparatus according to Item 5, wherein,

[0165] the shielding blades include: a first shielding blade that limits the irradiation field from a first direction toward a second direction opposite to the first direction; and a second shielding blade that moves independently of the first shielding blade and limits the irradiation field from the second direction toward the first direction,

[0166] the control unit is configured such that, in the second control, based on the operation input in the first direction to the top plate operation unit, the first shielding blade or the second shielding blade is moved in the second direction to adjust the irradiation field, thereby moving the center of the irradiation field of the X-ray image in the display unit in the second direction,

[0167] the control unit is configured such that, in the second control, based on the operation input in the second direction to the top plate operation unit, the first shielding blade or the second shielding blade is moved in the first direction to adjust the irradiation field, thereby moving the center of the irradiation field of the X-ray image in the display unit in the first direction.

[0168] (Item 8)

[0169] The X-ray fluoroscopic imaging apparatus according to Item 7, wherein,

[0170] The control unit is configured to move only one of the first shielding blade and the second shielding blade in the second control.

[0171] Explanation of reference numerals

[0172] 1: X-ray fluoroscopy apparatus main body; 2: top plate; 3: X-ray irradiation unit; 4: X-ray detection unit; 5: collimator; 7: top plate locking unit; 8: imaging unit; 11: first shielding blade; 12: second shielding blade; 25: top plate moving mechanism; 31: main control unit; 32: X-ray image generation unit; 40: display unit; 40a: center of the display unit; 41: X-ray image; 42: irradiation field; 42a: center of the irradiation field; 50: operation console; 51: top plate operation unit; 100: X-ray fluoroscopy apparatus.

Claims

1. An X-ray fluoroscopy and radiography apparatus, comprising: An imaging unit, which includes an X-ray irradiation unit that irradiates an object to be examined with X-rays, and an X-ray detection unit that detects the X-rays irradiated by the X-ray irradiation unit; An X-ray image generation unit, which generates an X-ray image based on the detection signal detected by the X-ray detection unit; A top plate, which is disposed between the X-ray irradiation unit and the X-ray detection unit, and is capable of placing the object to be examined and moving in the horizontal direction; A top plate moving mechanism, which moves the top plate; A top plate operation unit, which receives an operation input for moving the top plate; A top plate locking unit, which prohibits the movement of the top plate; A display unit, which displays the X-ray image generated by the X-ray image generation unit; And A control unit, which controls the movement of the top plate, and controls the display unit to display the X-ray image, wherein, in a first control when the movement of the top plate is not prohibited by the top plate locking unit, the control unit moves the top plate based on the operation input to the top plate operation unit, in a second control when the movement of the top plate is prohibited by the top plate locking unit, the control unit does not move the top plate but moves the center of the X-ray irradiation field of the X-ray image in the display unit based on the operation input to the top plate operation unit.

2. The X-ray fluoroscopy and radiography apparatus according to claim 1, wherein, in the second control, the control unit moves the center of the irradiation field of the X-ray image in the display unit in a direction opposite to the moving direction in the operation input to the top plate operation unit.

3. The X-ray fluoroscopy and radiography apparatus according to claim 2, wherein, it further includes an irradiation field adjustment unit, which adjusts the irradiation field of the X-rays, in the second control, the control unit controls to adjust the irradiation field through the irradiation field adjustment unit based on the operation input to the top plate operation unit, thereby moving the center of the irradiation field of the X-ray image in the display unit.

4. The X-ray fluoroscopy and radiography apparatus according to claim 3, wherein, in the second control, when moving the center of the irradiation field of the X-ray image in the display unit, the control unit aligns the center of the irradiation field of the X-ray image with the center of the display unit.

5. The X-ray fluoroscopy and radiography apparatus according to claim 3, wherein, the irradiation field adjustment unit includes shielding blades, and the shielding blades adjust the irradiation field by moving in a specified direction, in the second control, the control unit moves the shielding blades to move the center of the irradiation field of the X-ray image in the display unit in a direction opposite to the moving direction in the operation input to the top plate operation unit.

6. The X-ray fluoroscopy and radiography apparatus according to claim 5, wherein, The control unit is configured to, in the second control, move the center of the irradiation field of the X-ray image in the display unit in a direction opposite to the moving direction in the operation input to the top plate operation unit in accordance with the moving amount of the shielding blade.

7. The X-ray fluoroscopic imaging apparatus according to claim 5, wherein the shielding blade includes: a first shielding blade that limits the irradiation field from a first direction toward a second direction opposite to the first direction; and a second shielding blade that moves independently of the first shielding blade and limits the irradiation field from the second direction toward the first direction, the control unit is configured to, in the second control, move the first shielding blade or the second shielding blade in the second direction based on an operation input in the first direction to the top plate operation unit to adjust the irradiation field, thereby moving the center of the irradiation field of the X-ray image in the display unit in the second direction, the control unit is configured to, in the second control, move the first shielding blade or the second shielding blade in the first direction based on an operation input in the second direction to the top plate operation unit to adjust the irradiation field, thereby moving the center of the irradiation field of the X-ray image in the display unit in the first direction.

8. The X-ray fluoroscopic imaging apparatus according to claim 7, wherein the control unit is configured to move only one of the first shielding blade and the second shielding blade in the second control.

Images