X-ray fluoroscopy equipment

Abstract

This X-ray fluoroscopic imaging device (100) is provided with a top board (2), a top board operation unit (51) and a control unit (31), in which the control unit is configured such that the top board is moved in accordance with an operation input to the top board operation unit in a first control when the movement of the top board is not inhibited, and is also configured such that a center (42a) of an irradiation field (42) of X ray in an X-ray image (41) in a display unit (40) is moved while preventing the movement of the top board in accordance with an operation input to the top board operation unit in a second control when the movement of the top board is inhibited.

Description

[Technical Field]

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

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

[0003] The above-mentioned Japanese Patent Application Laid-Open No. 2018-29922 discloses an X-ray fluoroscopy system (X-ray fluoroscopy device) including 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 tabletop on which the subject is placed. The X-ray image detector is provided below the tabletop. The X-ray image detector is configured to be movable along the longitudinal direction of the tabletop between both ends extending in the shorter direction of the tabletop. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-29922 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, in an examination in which an instrument is introduced into the subject's body, such as an endoscopy, it is preferable for the surgeon or technician to position the region of interest at the center of the X-ray irradiation field rather than at the periphery, from the viewpoint of visibility. However, in such an examination, moving the subject by moving the tabletop while the instrument is introduced into the subject's body is problematic from the viewpoint of safety. Therefore, during the examination, movement of the tabletop on which the subject is placed may be prohibited. As a result, even if the position of the region of interest changes depending on the position of the instrument, it is not possible to adjust the center position of the X-ray irradiation field by moving the tabletop. Therefore, even when tabletop movement is prohibited during treatment or examination, it is desirable to be able to adjust the center position of the X-ray irradiation field, and for the surgeon or technician to be able to perform this adjustment intuitively.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide an X-ray fluoroscopy device that is capable of adjusting the center position of the X-ray irradiation field even when movement of the tabletop is prohibited during treatment, examination, etc., and that allows the operator or technician to intuitively perform the adjustment. [Means for solving the problem]

[0007] An X-ray fluoroscopy apparatus according to one aspect of the present invention includes an imaging unit including an X-ray irradiation unit that irradiates X-rays onto a subject and an X-ray detection unit that detects the X-rays irradiated from 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 arranged between the X-ray irradiation unit and the X-ray detection unit and that can move in a horizontal direction and on which a subject is placed, a top plate movement mechanism that moves the top plate, a top plate operation unit that accepts operation inputs to move the top plate, a top plate lock unit that prohibits movement of the top plate, and a top plate locking unit that locks the top plate by the X-ray image generation unit. The apparatus comprises a display unit that displays the generated X-ray image, and a control unit that controls the movement of the tabletop and controls the display of the X-ray image on the display unit, wherein the control unit is configured to move the tabletop based on an operation input to the tabletop operation unit in a first control when the tabletop movement is not prohibited by the tabletop lock unit, and is configured to move the center of the X-ray irradiation field of the X-ray image on the display unit without moving the tabletop based on an operation input to the tabletop operation unit in a second control when the tabletop movement is prohibited by the tabletop lock unit, In the second control, the center of the irradiation field of the X-ray image on the display unit is moved in a direction opposite to the direction of the operation input to the top board operation unit. are. [Effects of the Invention]

[0008] In one aspect of the present invention, as described above, the X-ray fluoroscopy apparatus is configured such that, in a first control mode when the top plate movement 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 operating unit, and in a second control mode when the top plate movement 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 on the display unit without moving the top plate based on an operation input to the top plate operating unit. This allows the center of the X-ray irradiation field of the X-ray image on the display unit to be moved while continuing to use the top plate operating unit, which is used to move the top plate when the top plate movement is not prohibited, even when the top plate movement is prohibited during treatment, examination, etc. Therefore, the center position of the X-ray irradiation field can be adjusted, and the adjustment can be intuitively performed by the surgeon or technician. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a block diagram showing a configuration of an X-ray fluoroscopic imaging apparatus according to an embodiment. [Figure 2] 1 is a schematic diagram showing an X-ray fluoroscopic imaging apparatus main body according to an embodiment. [Figure 3] 3 is a schematic diagram showing an example of a first group of multiple shielding blades and a second group of multiple shielding blades according to one embodiment. FIG. [Figure 4] 2 is a block diagram showing an example of the configuration of a moving mechanism and a rotating mechanism included in the X-ray fluoroscopic imaging apparatus main body according to one embodiment. FIG. [Figure 5] FIG. 2 is a schematic diagram illustrating an example of an operation console according to an embodiment. [Figure 6] 10A and 10B are explanatory schematic diagrams for explaining an example of centering processing and scaling processing by a main control unit according to an embodiment. [Figure 7] 10 is a flowchart illustrating a movement control process and a display control process performed by a main control unit in an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0011] (Overall configuration of X-ray fluoroscopy equipment) The overall configuration of an X-ray fluoroscopic imaging apparatus 100 according to one embodiment will be described with reference to FIGS.

[0012] 1, the X-ray fluoroscopic imaging apparatus 100 is an apparatus that uses X-rays to image a subject, which 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 results of imaging the subject with X-rays.

[0013] The X-ray fluoroscopy apparatus 100 comprises an X-ray fluoroscopy apparatus main body 1 (hereinafter simply referred to as "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 to be able to communicate with each other. The control device 30 is connected to the display unit 40 and the operation console 50.

[0014] (X-ray fluoroscopy device body) 2, the device main body 1 includes, as an imaging mechanism, a tabletop 2, an X-ray irradiation unit 3, an X-ray detection unit 4, a collimator 5, an imaging control unit 6 (see FIG. 1), and a tabletop lock unit 7 (see FIG. 1). The X-ray irradiation unit 3 and the X-ray detection unit 4 constitute an imaging unit 8 that captures an X-ray image 41 (see FIG. 6).

[0015] The tabletop 2 has a surface 2a on which a subject to be imaged (examination subject) is placed. The tabletop 2 has a substantially rectangular shape when viewed from a direction substantially perpendicular to the surface 2a (the Z direction in FIG. 2). In FIG. 2, the tabletop 2 has a substantially rectangular shape with its long sides extending in the X direction and its short sides extending in the Y direction.

[0016] The X-ray irradiator 3 generates X-rays when a high voltage is applied to it. The X-ray irradiator 3 is configured to irradiate the generated X-rays towards the X-ray detector 4. The X-ray irradiator 3 includes an X-ray tube that generates X-rays.

[0017] The collimator 5 is configured to adjust an irradiation field 42 (see FIG. 6) of X-rays generated by the X-ray tube. The collimator 5 is disposed forward in the direction of emission of X-rays. Inside the collimator 5, a first group of multiple shielding blades 10 is provided on the X-ray tube side as shown in FIG. 3(a), and a second group of multiple shielding blades 15 is provided on the tabletop 2 side as shown in FIG. 3(b). The X-rays emitted from the X-ray tube pass through an opening 5a formed by the first group of multiple shielding blades 10 and the second group of multiple shielding blades 15. The collimator 5 is an example of an "irradiation field adjusting unit" in the claims.

[0018] As shown in FIG. 3( a), the first group of multiple 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 provided on the Y1 side inside the collimator 5 and is configured to be able to focus the irradiated X-rays by moving in the Y2 direction. The second shielding blade 12 is provided on the Y2 side inside the collimator 5 and is configured to be able to focus the irradiated X-rays by moving in the Y1 direction. The third shielding blade 13 is provided on the X1 side inside the collimator 5 and is configured to be able to focus the irradiated X-rays by moving in the X2 direction. The fourth shielding blade 14 is provided on the X2 side inside the collimator 5 and is configured to be able to focus the irradiated X-rays by moving in the X1 direction.

[0019] 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 movable independently of one another. Each of the first shielding blade 11, the second shielding blade 12, the third shielding blade 13, and the fourth shielding blade 14 is configured to be movable in response to an operation input to a first shielding blade operation unit 52 (see FIG. 5) provided on the operation console 50. Furthermore, when the movement of the top board 2 is prohibited by the top board lock unit 7, the first shielding blade 11 and the second shielding blade 12 are configured to be movable based on an operation input to a top board operation unit 51 (see FIG. 5) through a second control by the main control unit 31 (see FIG. 1). The second control by the main control unit 31 will be described later.

[0020] 3(b), the second group of multiple shielding vanes 15 includes a fifth shielding vane 16, a sixth shielding vane 17, a seventh shielding vane 18, and an eighth shielding vane 19. The fifth shielding vane 16 is provided on the Y1 side inside the collimator 5 and is configured to be able to focus the irradiated X-rays by moving in the Y2 direction. The sixth shielding vane 17 is provided on the Y2 side inside the collimator 5 and is configured to be able to focus the irradiated X-rays by moving in the Y1 direction. The fifth shielding vane 16 and the sixth shielding vane 17 are configured as a first pair of shielding vanes 15a that are symmetrically controlled to move toward or away from each other along the Y direction.

[0021] The seventh shielding blade 18 is provided on the X1 side inside the collimator 5 and is configured to be able to focus the irradiated X-rays by moving in the X2 direction. The eighth shielding blade 19 is provided on the X2 side inside the collimator 5 and is configured to be able to focus 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 that are controlled symmetrically to move toward or away from each other along the X direction.

[0022] The first pair of shielding blades 15a consisting of the fifth shielding blade 16 and the sixth shielding blade 17, and the second pair of shielding blades 15b consisting of the seventh shielding blade 18 and the eighth shielding blade 19 are each configured to be movable in response to an operation input to the second shielding blade operating unit 53 (see Figure 5) provided on the operation console 50.

[0023] That is, the first group of multiple shielding blades 10 is configured to individually adjust the position of each side of the irradiation field 42. The second group of multiple shielding blades 15 is configured to adjust the width (left-right dimension) and length (up-down dimension) of the irradiation field 42 without changing the center position of the irradiation field 42.

[0024] 2, the X-ray detection unit 4 detects X-rays that are irradiated from the X-ray irradiator 3 and have passed through the subject. The X-ray detection unit 4 has, for example, an FPD (Flat Panel Detector). The X-ray detection unit 4 transmits a detection signal, which is an electrical signal corresponding to the detected X-rays, to an X-ray image generation unit 32 (see FIG. 1), which will be described later.

[0025] In the device main body 1, the X-ray irradiation unit 3 is provided on the front 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 provided so as to face each other with the top plate 2 in between.

[0026] The imaging control unit 6 (see FIG. 1) is configured to control the irradiation of X-rays from the device main body 1. The imaging control unit 6 is composed of a control device for the X-ray irradiation unit 3, etc. The imaging control unit 6 starts or stops imaging based on instructions from the main control unit 31.

[0027] The device body 1 includes, as a support mechanism, a base 20, a first support column 21, a holder 22, and a second support column 23. As shown in Fig. 4, the device body 1 also includes, as movement mechanisms, a holder movement mechanism 24, a tabletop movement mechanism 25, an X-ray detection unit movement mechanism 26, and an X-ray irradiation unit movement mechanism 27. The device body 1 also includes, as rotation mechanisms, a tabletop rotation mechanism 28 and an X-ray irradiation unit rotation mechanism 29.

[0028] As shown in Fig. 2, the first support column 21 supports the entire device body 1. The first support column 21 is provided on a base 20. A holder movement mechanism 24 (see Fig. 4) is provided on the first support column 21. The holder movement mechanism 24 is configured to be able to move the holder 22 in the Z direction.

[0029] The holder 22 holds the tabletop 2, the second support column 23, and the X-ray detection unit 4. The holder 22 is provided with a tabletop moving mechanism 25 (see FIG. 4), an X-ray detection unit moving mechanism 26 (see FIG. 4), and a tabletop rotating mechanism 28 (see FIG. 4). The tabletop moving mechanism 25 is configured to move the tabletop 2 in the short-side direction of the tabletop 2 (Y direction in FIG. 2). The X-ray detection unit moving mechanism 26 is configured to move the X-ray detection unit 4 in the long-side direction of the tabletop 2 (X direction in FIG. 2). The XY direction in FIG. 2 is a substantially horizontal direction. The tabletop rotating mechanism 28 is configured to rotate the tabletop 2 around an axis 90 extending along the short-side direction (Y direction) of the tabletop 2.

[0030] The second support column 23 supports the X-ray irradiator 3. The second support column 23 is provided with an X-ray irradiator moving mechanism 27 (see FIG. 4) and an X-ray irradiator rotating mechanism 29 (see FIG. 4). The X-ray irradiator moving mechanism 27 is configured to move the X-ray irradiator 3 in the longitudinal direction of the tabletop 2 (the X direction in FIG. 2). The imaging section 8 including the X-ray irradiator 3 and the X-ray detection section 4 can move integrally with respect to the tabletop 2 by synchronous operation of the X-ray irradiator moving mechanism 27 and the X-ray detection section moving mechanism 26. The X-ray irradiator rotating mechanism 29 is configured to rotate the X-ray irradiator 3 around an axis 91 extending along the short-side direction (the Y direction) of the tabletop 2.

[0031] The top plate locking unit 7 (see FIG. 1) is configured to be able to lock the top plate 2 so that it does not move relative to the holding unit 22. The top plate locking unit 7 can switch between a locked state in which the top plate 2 cannot move relative to the holding unit 22, and an unlocked state in which the top plate 2 can move relative to the holding unit 22. The top plate locking unit 7 is configured to, for example, cancel out the magnetic force of a permanent magnet by energizing an electromagnet using the magnetic force of a permanent magnet, thereby weakening the restriction on movement of the top plate 2 relative to the holding unit 22. In other words, when the electromagnet is not energized, movement of the top plate 2 in the short-side direction (Y direction in FIG. 2) relative to the holding unit 22 is restricted (locked). Note that the top plate locking unit 7 can use a known configuration capable of restricting movement of the top plate 2 in the short-side direction relative to the holding unit 22, and the configuration of the top plate locking unit 7 is not particularly limited.

[0032] (Controller, display and operation console) 1, the control device 30 is configured by, for example, a PC (personal computer). The control device 30 includes a main control unit 31, an X-ray image generation unit 32, a storage unit 33, and an input / output unit 34. The control device 30 is connected to a display unit 40 and an operation console 50. The main control unit 31 is an example of the "control unit" in the claims.

[0033] The main control unit 31 is composed of a processor such as a CPU (Central Processing Unit), and controls the operation of the X-ray fluoroscopy apparatus 100, including controlling the movement of the tabletop 2 and the display of the X-ray image 41 on the display unit 40, by executing application programs stored in the memory unit 33.

[0034] The main control unit 31 is configured to perform a first control to move the top plate 2 (see Figure 2) based on an operation input to the top plate operation unit 51 (see Figure 5) when movement of the top plate 2 is not prohibited by the top plate locking unit 7, and is configured to perform a second control to move the center 42a (see Figure 6) of the irradiation field 42 of the X-ray image 41 on the display unit 40 without moving the top plate 2 based on an operation input to the top plate operation unit 51 when movement of the top plate 2 is prohibited by the top plate locking unit 7.

[0035] The X-ray image generating unit 32 is configured with a processor such as a GPU (Graphics Processing Unit) or an FPGA (Field-Programmable Gate Array) configured for generating X-ray images. The X-ray image generating unit 32 is configured to generate an X-ray image 41 based on the detection signal detected by the X-ray detection unit 4.

[0036] The storage unit 33 includes a volatile storage device and a nonvolatile storage device, and stores application programs and the like.

[0037] The input / output unit 34 is configured by various interfaces for inputting and outputting signals to and from the control device 30. The input / output unit 34 is connected to a display unit 40 and an operation console 50.

[0038] The display unit 40 is, for example, a liquid crystal display device, etc. The display unit 40 is configured to be able to display the X-ray image 41 generated by the X-ray image generating unit 32, etc.

[0039] As shown in FIG. 5, the operation console 50 includes a top board operation unit 51, a first shielding blade operation unit 52, a second shielding blade operation unit 53, and an input unit .

[0040] The top board operation unit 51 is, for example, a joystick. The top board operation unit 51 is configured to be tilted in a first direction (rightward in FIG. 5), a second direction (leftward in FIG. 5), a third direction (upward in FIG. 5), and a fourth direction (downward in FIG. 5), thereby enabling a directional input corresponding to the tilted direction. Details of a first control for moving the top board 2 and a second control for moving the center 42a (see FIG. 6) of the irradiation field 42 of the X-ray image 41 based on an operation input to the top board operation unit 51 will be described later.

[0041] The first shielding blade operating unit 52 is configured to receive operation inputs to move each of 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 operating unit 52 includes, for example, four knobs that correspond to each of the first shielding blade 11, the second shielding blade 12, the third shielding blade 13, and the fourth shielding blade 14 and that can be moved in the front-to-rear direction (the up-and-down direction in FIG. 5 ).

[0042] The first shielding blade operation unit 52 includes a first knob 52a, a second knob 52b, a third knob 52c, and a fourth knob 52d. The first knob 52a is configured to receive an operation input for moving the first shielding blade 11 in the Y2 direction to narrow one side of the X-ray irradiation field 42 in the Y1 direction, and to receive an operation input for moving the first shielding blade 11 in the Y1 direction to release the diaphragm. The second knob 52b is configured to receive an operation input for moving the second shielding blade 12 in the Y1 direction to narrow one side of the X-ray irradiation field 42 in the Y2 direction, and to receive an operation input for moving the second shielding blade 12 in the Y2 direction to release the diaphragm. The third knob 52c is configured to receive an operation input for moving the third shielding blade 13 in the X2 direction to narrow one side of 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 release the diaphragm. The fourth knob 52d is configured to accept operational input for moving the fourth shielding blade 14 in the X1 direction to narrow one side of the X2 direction of the X-ray irradiation field 42, and to accept operational input for moving it in the X2 direction to release the narrowing.

[0043] The second shielding blade operating unit 53 is configured to receive operation inputs to move a first pair of shielding blades 15a consisting of the fifth shielding blade 16 and the sixth shielding blade 17, and a second pair of shielding blades 15b consisting of the seventh shielding blade 18 and the eighth shielding blade 19. The second shielding blade operating unit 53 includes, for example, two knobs that are movable in the front-to-rear direction (the up-and-down direction in FIG. 5 ) and correspond to each of the first pair of shielding blades 15a and the second pair of shielding blades 15b.

[0044] The second shielding blade operation unit 53 includes a fifth knob 53a and a sixth knob 53b. The fifth knob 53a is configured to receive an operation input for moving the first pair of shielding blades 15a toward each other along the Y direction to narrow the two Y-direction sides of the X-ray irradiation field 42, 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 diaphragm. The sixth knob 53b is configured to receive an operation input for moving the second pair of shielding blades 15b toward each other along the X direction to narrow the two X-direction sides of the X-ray irradiation field 42, 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 diaphragm.

[0045] The input unit 54 is, for example, a touch panel. The input unit 54 is configured to receive input operations by an operator or technician to operate the X-ray fluoroscopy apparatus 100. For example, the input unit 54 is configured to receive operation inputs for locking and unlocking the movement of the top board 2 in the Y direction by the top board locking unit 7.

[0046] (First control and second control) The main controller 31 (see FIG. 1) is configured to perform the first control when movement of the top 2 is not prohibited by the top locking unit 7. The main controller 31 is configured to perform the first control, for example, based on receipt of an operation input to unlock the top 2 via the input unit 54. In the first control, the main controller 31 moves the top 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 via the top operation unit 51.

[0047] In the first control, the main controller 31 (see FIG. 1) associates a first direction on the top board operation unit 51 with the Y1 direction (see FIG. 2) as the movement direction of the top board 2. In the first control, when the top board operation unit 51 is tilted in the first direction, the main controller 31 moves the top board 2 in the Y1 direction. At this time, if an X-ray image 41 is displayed on the display unit 40, the X-ray image 41 scrolls in the Y1 direction on the display unit 40. In the first control, the main controller 31 also associates a second direction on the top board operation unit 51 with the Y2 direction (see FIG. 2) as the movement direction of the top board 2. In the first control, when the top board operation unit 51 is tilted in the second direction, the main controller 31 moves the top board 2 in the Y2 direction. At this time, if an X-ray image 41 is displayed on the display unit 40, the X-ray image 41 scrolls in the Y2 direction on the display unit 40.

[0048] In the first control, the main controller 31 (see FIG. 1) associates a third direction on the top board operation unit 51 with the X1 direction (see FIG. 2) as the movement direction of the imaging unit 8. In the first control, when the top board operation unit 51 is tilted in the third direction, the main controller 31 moves the imaging unit 8 in the X1 direction. In the first control, the main controller 31 also associates a fourth direction on the top board operation unit 51 with the X2 direction (see FIG. 2) as the movement direction of the imaging unit 8. In the first control, when the top board operation unit 51 is tilted in the fourth direction, the main controller 31 moves the imaging unit 8 in the X2 direction.

[0049] Furthermore, the main control unit 31 (see FIG. 1) is configured to perform the second control in a state in which movement of the top plate 2 is prohibited by the top plate locking unit 7. The main control unit 31 is configured to perform the second control, for example, based on receipt of an operation input to lock the top plate 2 via the input unit 54. In the second control, 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, based on the operation input via the top plate operating unit 51.

[0050] In the second control, the main controller 31 (see FIG. 1) associates a first direction in the top panel operation unit 51 with the Y2 direction (see FIG. 3(a)) as the movement direction of the first shielding blade 11. In the second control, when the top panel operation unit 51 is tilted in the first direction, the main controller 31 moves the first shielding blade 11 in the Y2 direction. As a result, the main controller 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 on the display unit 40 in the second direction (Y2 direction) opposite to the first direction in the operation input to the top panel operation unit 51. Furthermore, in the second control, when the first shielding blade 11 has already been moved in the Y2 direction, the main control unit 31 associates the second direction in the tabletop operation unit 51 with the Y1 direction (see FIG. 3(a)) as the movement direction of the first shielding blade 11. In the second control, when the first shielding blade 11 has already been moved in the Y2 direction and the tabletop operation unit 51 is tilted in the second direction, the main control unit 31 moves the first shielding blade 11 in the Y1 direction.

[0051] Furthermore, in the second control, the main controller 31 (see FIG. 1) associates the second direction in the top panel operation unit 51 with the Y1 direction (see FIG. 3(a)) as the movement direction of the second shielding blade 12. In the second control, when the top panel operation unit 51 is tilted in the second direction, the main controller 31 moves the second shielding blade 12 in the Y1 direction. As a result, the main controller 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 on the display unit 40 in the first direction (Y1 direction) opposite to the second direction in the operation input to the top panel operation unit 51. Furthermore, in the second control, when the second shielding blade 12 has already been moved in the Y1 direction, the main control unit 31 associates the first direction in the tabletop operation unit 51 with the Y2 direction (see FIG. 3(a)) as the movement direction of the second shielding blade 12. In the second control, when the second shielding blade 12 has been moved in the Y1 direction and the tabletop operation unit 51 is tilted in the first direction, the main control unit 31 moves the second shielding blade 12 in the Y2 direction.

[0052] In addition, in the second control, the main control unit 31 (see Figure 1) is configured to move the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in a direction opposite to the movement direction in the operation input to the top board operation unit 51, depending on the amount of movement in the Y direction of the first shielding blade 11 or the second shielding blade 12.

[0053] In addition, the main control unit 31 (see Figure 1) is configured to move only one of the first shielding blade 11 and the second shielding blade 12 when the top plate operating unit 51 is tilted in one of the first direction and the second direction in the second control.

[0054] In the second control, similar to the first control, the main controller 31 (see FIG. 1) associates a third direction on the top board operation unit 51 with the X1 direction (see FIG. 2) as the movement direction of the imaging unit 8. In the first control, when the top board operation unit 51 is tilted in the third direction, the main controller 31 moves the imaging unit 8 in the X1 direction. In the second control, similar to the first control, the main controller 31 associates a fourth direction on the top board operation unit 51 with the X2 direction (see FIG. 2) as the movement direction of the imaging unit 8. In the first control, when the top board operation unit 51 is tilted in the fourth direction, the main controller 31 moves the imaging unit 8 in the X2 direction.

[0055] (Centering of X-ray images in the second control) In the second control, when moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40, the main control unit 31 (see FIG. 1) is configured to perform a centering process 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, as shown in FIG. 6(c). Note that the irradiation field 42 refers to the range of X-ray irradiation that is not blocked by the shielding blades.

[0056] As shown in FIG. 6(b), in the second control, when the top panel operation unit 51 is tilted in the first direction, the main controller 31 (see FIG. 1) moves the first shielding blade 11 in the Y2 direction. As a result, the irradiation field 42 narrowed by the first shielding blade 11 is displayed on the display unit 40 as being biased in the Y2 direction. As shown in FIG. 6(c), the main controller 31 is configured to control the X-ray image 41 to move 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 displaying the irradiation field 42, which was displayed as being biased in the Y2 direction on the display unit 40, at approximately the center in the Y direction on the display unit 40. Note that the blacked-out area at the left end of the display unit 40 in FIG. 6(c) is an area where the X-ray image 41 is not displayed.

[0057] In addition, in the second control, when the tabletop operation unit 51 is tilted in the second direction, the main control unit 31 (see Figure 1) is configured to display the irradiation field 42, which is displayed biased in the Y1 direction on the display unit 40, at approximately the center of the Y direction on the display unit 40.

[0058] (X-ray image scaling process in second control) In the second control, the main control unit 31 (see Figure 1) is configured to perform a scaling process to enlarge or reduce the image of the adjusted irradiation field 42 while maintaining the aspect ratio of the X-ray image 41, as shown in Figure 6(d).

[0059] When the surgeon or technician operates the sixth knob 53b of the second shielding blade operating unit 53 to move the second pair of shielding blades 15b toward each other in the X direction as shown by the arrows in FIG. 6(c) and narrow the two X-direction sides of the irradiation field 42, the main controller 31 is configured to expand the X-direction and Y-direction sizes of the adjusted irradiation field 42 while maintaining the ratio between the X-direction and the Y-direction of the X-ray image 41 so that the X-direction size of the irradiation field 42 with the narrowed two X-direction sides matches the vertical screen size of the display unit 40, as shown in FIG. 6(d).

[0060] That is, the main controller 31 enlarges the size of the irradiation field 42 in the X and Y directions while maintaining the ratio between the X and Y directions of the X-ray image 41 so as to align the two narrowed sides of the irradiation field 42 in the X direction with the two vertical sides of the display unit 40. Here, the "screen size of the display unit 40" means the size of the display area of ​​the X-ray image 41 on the display unit 40, including full-screen display.

[0061] In addition, if the ratio of the X and Y directions of the narrowed irradiation field 42 does not match the aspect ratio of the screen size, the setting may be such that priority is given to matching the X direction size of the irradiation field 42 with the vertical screen size of the display unit 40, or that priority is given to matching the Y direction size of the irradiation field 42 with the horizontal screen size of the display unit 40.

[0062] Furthermore, for example, in the second control, when the first shielding blade 11 has already been moved in the Y2 direction and the tabletop operation unit 51 has been tilted in the second direction, and when the second pair of shielding blades 15b are moved away from each other and the diaphragm is released by an operation input by the surgeon or technician using the sixth knob 53b of the second shielding blade operation unit 53, the main controller 31 (see FIG. 1 ) is configured to reduce the sizes in the X and Y directions of the adjusted irradiation field 42 while maintaining the ratio between the X and Y directions of the X-ray image 41 so that the size in the X direction of the radiation field 42 after the diaphragm is released matches the vertical screen size of the display unit 40. That is, the main controller 31 reduces the sizes in the X and Y directions of the radiation field 42 while maintaining the ratio between the X and Y directions of the X-ray image 41 so that the two sides in the X direction of the narrowed radiation field 42 are aligned with the two vertical sides of the display unit 40.

[0063] (Operation input to the top panel operation unit and display of X-ray images in the second control) 6(a) to 6(d), the operation input to the tabletop operation unit 51 in the second control and the display of the X-ray image 41 will be described. Below, as an example of this embodiment, the display of the X-ray image 41 on the display unit 40 based on the operation input by tilting the tabletop operation unit 51 in the first direction in the second control will be described.

[0064] As shown in FIG. 6(a), when the top board 2 is prevented from moving by the top board lock unit 7, an X-ray image 41 is displayed on the display unit 40. At this time, the top board operation unit 51 is not tilted in any of the first to fourth directions. None of the first to fourth shielding blades 11 to 14 and the fifth to eighth shielding blades 16 to 19 have been moved to narrow the irradiated X-rays. The imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 shown in FIG. 6(a) is approximately the same as the detection range of the FPD of the X-ray detection unit 4.

[0065] Then, by tilting the top panel operation unit 51 in the first direction, an operation input in the first direction is executed on the top panel operation unit 51. Based on the operation input in the first direction on the top panel operation unit 51, the main controller 31 performs control to move the first shielding blade 11 in the second direction to adjust the irradiation field 42. As a result, an X-ray shielding area 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 on the display unit 40 is moved in the second direction. That is, as shown in FIG. 6(b), the irradiation field 42 narrowed by the first shielding blade 11 is displayed on the display unit 40 with a bias in the Y2 direction.

[0066] Then, as shown in Figure 6(c), the main control unit 31 controls the X-ray image 41 to move in the Y1 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, thereby causing the irradiation field 42, which was displayed biased in the Y2 direction on the display unit 40, to be displayed approximately in the center of the Y direction on the display unit 40.

[0067] Based on an operation input in the first direction to the tabletop operation unit 51, the irradiation field 42 displayed on the display unit 40 with a bias in the Y2 direction is displayed approximately in the center of the Y direction on the display unit 40, and the adjusted irradiation field 42 on the display unit 40 moves in the Y1 direction.

[0068] Here, in the first control, when an input in the first direction is made to the top board operation unit 51, the top board 2 moves in the Y1 direction, and the subject moves to the left in the X-ray image 41 on the display unit 40. Furthermore, in the second control, when an input in the first direction is made to the top board operation unit 51, even though the top board 2 does not move, the right edge of the X-ray image 41 is scraped off and the entire X-ray image including the subject moves to the left as if the top board 2 had moved to the left, as in the first control. In other words, the scrolling direction on the display unit 40 in response to the operation of the top board operation unit 51 in the first control matches the scrolling direction on the display unit 40 in response to the operation of the top board operation unit 51 in the second control. Therefore, based on the operation input in the first direction to the top board operation unit 51, the surgeon or technician can visually recognize on the display unit 40 that the top board 2, which is prohibited from moving, is moving in the Y1 direction.

[0069] Then, the two sides of the irradiation field 42 in the X direction are narrowed based on the operation input to the sixth knob 53b of the second shielding blade operation unit 53, and the main controller 31 expands the sizes of the adjusted irradiation field 42 in the X direction and the Y direction while maintaining the ratio between the X direction and the Y direction of the X-ray image 41 so that the size of the irradiation field 42 in the X direction with the two narrowed sides in the X direction matches the vertical screen size of the display unit 40, as shown in Fig. 6(d). This completes the second control by the main controller 31 based on the operation input to the top board operation unit 51 in the first direction.

[0070] It is also possible to return from the display of the X-ray image 41 displayed on the display unit 40 shown in Fig. 6(d) to the display of the X-ray image 41 displayed on the display unit 40 shown in Fig. 6(a) by performing the above-described operations and controls in reverse order. Also, by further performing the above-described operations and controls from the display of the X-ray image 41 displayed on the display unit 40 shown in Fig. 6(d), it is also possible to further move the center 42a of the irradiation field 42 of the X-ray image 41 displayed on the display unit 40 shown in Fig. 6(d) in the Y2 direction, and then align the center 42a of the irradiation field 42 of the X-ray image 41 with the center 40a of the display unit 40 and further enlarge the size of the adjusted irradiation field 42.

[0071] In addition, in the second control, the display of the X-ray image 41 on the display unit 40 when the tabletop operation unit 51 is tilted in the second direction is similar to the display of the X-ray image 41 on the display unit 40 when the tabletop operation unit 51 is tilted in the first direction as described above.

[0072] That is, when the top board operation unit 51 is not tilted and the first shielding blade 11 to the eighth shielding blade 19 are not moved, tilting the top board operation unit 51 in the second direction executes an operation input in the second direction on the top board operation unit 51. Based on the operation input in the second direction on the top board operation unit 51, the main controller 31 controls the second shielding blade 12 to move in the first direction to adjust the irradiation field 42. As a result, the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 moves in the first direction. Then, the main controller 31 controls the center 42a of the irradiation field 42 of the X-ray image 41 to be aligned with the center 40a of the display unit 40, thereby causing the irradiation field 42, which was displayed offset in the Y1 direction on the display unit 40, to be displayed approximately at the center in the Y direction on the display unit 40.

[0073] Based on the operation input in the second direction to the top operation unit 51, the irradiation field 42 displayed on the display unit 40 as being biased in the Y1 direction is displayed at approximately the center of the Y direction on the display unit 40, so that the adjusted irradiation field 42 moves in the Y2 direction on the display unit 40. Therefore, based on the operation input in the second direction to the top operation unit 51, the operator or technician can visually recognize on the display unit 40 that the top 2, which is prohibited from moving, is moving in the Y2 direction.

[0074] (Movement control processing and display control processing by the main control unit) The movement control process and display control process by the main control unit 31 according to this embodiment will be described with reference to Fig. 7. The order of the processing steps can be reversed or executed simultaneously as long as there is no contradiction between them.

[0075] In step S1, the main control unit 31 determines whether or not movement of the top plate 2 is prohibited by the top plate lock unit 7. If the main control unit 31 determines that movement of the top plate 2 is prohibited by the top plate lock unit 7 (Yes in step S1), the process proceeds to step S2, and if the main control unit 31 determines that movement of the top plate 2 is not prohibited by the top plate lock unit 7 (No in step S1), the process proceeds to step S3.

[0076] In step S2, the main controller 31 performs a second control based on an operation input to the top operation unit 51. In detail, the main controller 31 performs a process of moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 without moving the top 2, based on the operation input to the top operation unit 51. Thereafter, the process proceeds to step S4.

[0077] In step S3, the main controller 31 performs a first control based on an operation input to the top board operation unit 51. In detail, the main controller 31 performs a process to move the top board 2 based on an operation input to the top board operation unit 51. Thereafter, the process ends.

[0078] In step S4, the main controller 31 determines whether or not an operation input in the first direction or the second direction has been acquired for the top board operation unit 51. If the main controller 31 has acquired an operation input in the first direction or the second direction for the top board operation unit 51 (Yes in step S4), the process proceeds to step S5, and if the main controller 31 determines that an operation input in the first direction or the second direction for the top board operation unit 51 has not been acquired (No in step S4), the process proceeds to step S4.

[0079] In step S5, the main controller 31 controls the collimator 5 to adjust the irradiation field 42, thereby moving 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 movement direction of the operation input to the tabletop operation unit 51. Then, the process proceeds to step S6.

[0080] In step S6, the main controller 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.

[0081] In step S7, the main control unit 31 determines whether or not an operation input of the sixth knob 53b for the second pair of shielding blades 15b has been acquired. If the main control unit 31 has acquired an operation input of the sixth knob 53b for the second pair of shielding blades 15b (Yes in step S7), the process proceeds to step S8, and if the main control unit 31 determines that an operation input of the sixth knob 53b for the second pair of shielding blades 15b has not been acquired (No in step S7), the process then ends.

[0082] In step S8, the main controller 31 determines whether the acquired operation input of the sixth knob 53b is an operation input for moving the second pair of shielding blades 15b toward each other along the X direction to narrow the two X-direction sides of the X-ray irradiation field 42. If the main controller 31 determines that the operation input is an operation input for narrowing the two X-direction sides of the X-ray irradiation field 42 (Yes in step S8), the process proceeds to step S9, and if the main controller 31 determines that the operation input is not an operation input for narrowing the two X-direction sides of the X-ray irradiation field 42 but an operation input for moving the two X-direction sides of the X-ray irradiation field 42 away from each other to release the narrowing (No in step S8), the process proceeds to step S10.

[0083] In step S9, the main controller 31 expands the size of the adjusted irradiation field 42, the two sides of which have been narrowed in the X direction, so that the size in the X direction of the irradiation field 42 matches the vertical screen size of the display unit 40. Then, the process ends.

[0084] In step S10, the main controller 31 reduces the size of the adjusted irradiation field 42 so that the size in the X direction of the irradiation field 42 after the aperture is released matches the vertical screen size of the display unit 40. Then, the process ends.

[0085] In step S11, the main controller 31 determines whether or not an operation input in the first direction or the second direction has been acquired for the top board operation unit 51. If the main controller 31 has acquired an operation input in the first direction or the second direction for the top board operation unit 51 (Yes in step S11), the process proceeds to step S12, and if the main controller 31 determines that an operation input in the first direction or the second direction for the top board operation unit 51 has not been acquired (No in step S11), the process proceeds to step S11.

[0086] In step S12, the main control unit 31 moves the tabletop 2 in the movement direction indicated by the operation input to the tabletop operation unit 51. Then, the process ends.

[0087] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0088] In this embodiment, as described above, the imaging unit 8 includes the X-ray irradiator 3 that irradiates the subject with X-rays and the X-ray detector 4 that detects the X-rays irradiated from the X-ray irradiator 3, the X-ray image generator 32 that generates an X-ray image 41 based on a detection signal detected by the X-ray detector 4, the top board 2 that is arranged between the X-ray irradiator 3 and the X-ray detector 4 and that can move in the horizontal direction and on which the subject is placed, the top board movement mechanism 25 that moves the top board 2, the top board operation unit 51 that accepts operation inputs to move the top board 2, the top board lock unit 7 that prohibits movement of the top board 2, and a display unit 8 that displays the X-ray image 41 generated by the X-ray image generator 32. and a main control unit 31 that controls the movement of the top 2 and controls the display of an X-ray image 41 on the display unit 40, wherein the main control unit 31 is configured to move the top 2 based on an operation input to the top operation unit 51 in a first control when movement of the top 2 is not prohibited by the top lock unit 7, and to perform a second control when movement of the top 2 is prohibited by the top lock unit 7, to move a center 42a of an X-ray irradiation field 42 of the X-ray image 41 on the display unit 40 without moving the top 2 based on an operation input to the top operation unit 51. In this way, even when movement of the top 2 is prohibited, the center 42a of the X-ray irradiation field 42 of the X-ray image 41 on the display unit 40 can be moved while continuing to use the top operation unit 51 that is used to move the top 2 when movement of the top 2 is not prohibited. Therefore, even when movement of the tabletop 2 is prohibited during treatment or examination, the center position of the X-ray irradiation field 42 can be adjusted, and the adjustment can be performed intuitively by the operator or technician.

[0089] Furthermore, in the above embodiment, the following additional effects can be obtained by configuring as follows.

[0090] That is, in this embodiment, as described above, the main controller 31 is configured to, in the second control, 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 direction of movement in the operation input to the top board operation unit 51. This allows the movement direction in the operation input to the top board operation unit 51 to coincide with the movement direction of the irradiation field 42 of the X-ray image 41, allowing for more intuitive operation using the top board operation unit 51.

[0091] Furthermore, as described above, this embodiment further includes a collimator 5 (irradiation field adjusting unit) that adjusts the X-ray irradiation field 42, and the main controller 31 is configured to control the collimator 5 to adjust the irradiation field 42 based on an operation input to the top board operation unit 51 in the second control, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40. In this way, by adjusting the irradiation field 42 to narrow it down, areas that do not need to be viewed can be excluded from the imaging range, thereby reducing the X-ray irradiation range and reducing the X-ray exposure dose of the subject.

[0092] Furthermore, in this embodiment, as described above, the main controller 31 is configured 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 when moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in the second control. This makes it possible to visually confirm on the display unit 40 that the tabletop 2, which is prohibited from moving based on the movement direction in the operation input to the tabletop operation unit 51, is moving in the same direction as the movement direction. This allows for more intuitive operation using the tabletop operation unit 51, and improves the visibility of the region of interest in the X-ray image 41.

[0093] Furthermore, in this embodiment, as described above, the collimator 5 includes shielding blades that adjust the irradiation field 42 by moving in a predetermined direction, and the main control unit 31 is configured to move the shielding blades in the second control 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 direction of movement in the operation input to the tabletop operation unit 51. By moving the shielding blades, the tabletop 2, which is prohibited from moving, can be visually recognized on the display unit 40 as if it were moving, allowing for even more intuitive operation using the tabletop operation unit 51.

[0094] Furthermore, in this embodiment, as described above, the main controller 31 is configured to, in the second control, move the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in a direction opposite to the direction of movement in the operation input to the top board operation unit 51, according to the amount of movement of the shielding blades. In this way, the main controller 31 can appropriately move the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 according to the amount of movement of the shielding blades by relating the amount of operation input to the top board operation unit 51 to the amount of movement of the shielding blades.

[0095] Furthermore, in this embodiment, as described above, the shielding blades include a first shielding blade 11 that narrows 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 narrows the irradiation field 42 from the second direction toward the first direction, and the main control unit 31 is configured, in the second control, to move the first shielding blade 11 or the second shielding blade 12 in the second direction to adjust the irradiation field 42 based on an operation input in the first direction to the top panel operation unit 51, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in the second direction, and is configured to move the first shielding blade 11 or the second shielding blade 12 in the first direction to adjust the irradiation field 42 based on an operation input in the second direction to the top panel operation unit 51, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in the first direction. By adjusting the irradiation field 42 by moving the first shielding blade 11 or the second shielding blade 12, the movement direction of the operation input to the top panel operation unit 51 can be matched with the movement direction of the irradiation field 42 of the X-ray image 41, allowing for more intuitive operation using the top panel operation unit 51.

[0096] Furthermore, in this 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. As a result, 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 on the display unit 40, the tabletop 2, which is prohibited from moving, can be visually recognized on the display unit 40 as if it were moving. This allows for more intuitive operation using the tabletop operation unit 51.

[0097] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the description of the above embodiments, and includes all modifications (variations) within the meaning and scope of the claims.

[0098] For example, in the above embodiment, the main controller 31 performs control to adjust the irradiation field 42 using the shielding blades based on an operation input to the top board operation unit 51 in the second control, thereby moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40, but the present invention is not limited to this. In the present invention, the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 may be moved by sliding (shifting) the X-ray image 41 in the Y direction and displaying it on the display unit 40, without performing control to adjust the irradiation field 42 using the shielding blades.

[0099] Furthermore, in the above embodiment, an example was shown in which the imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 is approximately the same as the detection range of the FPD included in the X-ray detection unit 4, but the present invention is not limited to this. 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 is not particularly limited. For example, the imaging range of the X-ray image 41 in the initial state displayed on the display unit 40 may be 70% or 90% of the detection range of the FPD included in the X-ray detection unit 4.

[0100] For example, the operation input to the tabletop operation unit 51 and the display of the X-ray image 41 in the second control will be described when 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 of the X-ray detection unit 4. Below, as an example of a modified example, the display of the X-ray image 41 on the display unit 40 based on the operation input by tilting the tabletop operation unit 51 in the first direction in the second control will be described.

[0101] When 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 by the FPD of the X-ray detection unit 4, an X-ray shielding area corresponding to 15% of the first shielding blade 11 is formed at the right end of the display unit 40, and an X-ray shielding area corresponding to 15% of the second shielding blade 12 is formed at the left end of the display unit 40.

[0102] By tilting the top panel operation unit 51 in a first direction, an operation input in the first direction is executed on the top panel operation unit 51. Based on the operation input in the first direction on the top panel operation unit 51, the main controller 31 controls the first shielding blade 11 to move in the second direction and also controls the second shielding blade 12 to move in the second direction. That is, the main controller 31 controls the first shielding blade 11 and the second shielding blade 12 to move in the second direction until 15% of the X-ray shielded area corresponding to the second shielding blade 12 disappears at the left end of the display unit 40. Therefore, 15% of the X-ray shielded area at the left end of the display unit 40 becomes visible. Thereafter, the main controller 31 controls the movement of only the first shielding blade 11 in the second direction. The radiation field 42 narrowed by the first shielding blade 11 and expanded by the second shielding blade 12 is displayed on the display unit 40 with a bias in the Y2 direction.

[0103] The main controller 31 then controls the alignment of 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, which was displayed offset in the Y2 direction on the display unit 40, to be displayed approximately at the center in the Y direction on the display unit 40. Based on an operation input in the first direction to the top operation unit 51, the irradiation field 42, which was displayed offset in the Y2 direction on the display unit 40, is displayed approximately at the center in the Y direction on the display unit 40, thereby causing the adjusted irradiation field 42 on the display unit 40 to move in the Y1 direction. This allows the surgeon or technician to visually recognize on the display unit 40 that the top 2, which is prohibited from moving, is moving in the Y1 direction based on the operation input in the first direction to the top operation unit 51.

[0104] Furthermore, in the above embodiment, an example was shown in which the input unit 54 received operational input for locking and unlocking the movement of the top 2 in the Y direction by the top lock unit 7, but the present invention is not limited to this. In the present invention, the top lock unit 7 may be configured to prohibit movement of the top 2 in the Y direction based on an operational input to the treatment device to start treatment or an operational input to the examination device to start examination, and the main controller 31 may be configured to perform second control based on an operational input to the top operation unit 51.

[0105] In the above embodiment, the tabletop operation unit 51 is a joystick, but the present invention is not limited to this. In the present invention, the tabletop operation unit 51 may be configured with a component other than a joystick, such as a remote control lever or an operation panel having multiple operation buttons.

[0106] In the above embodiment, the first shielding blade operation unit 52 and the second shielding blade operation unit 53 are configured as knobs that can be moved in the forward and backward directions, but the present invention is not limited to this. The first shielding blade operation unit 52 and the second shielding blade operation unit 53 may be configured as an operation panel having a plurality of operation buttons.

[0107] In the above embodiment, 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 to this. The number of shielding blades included in the collimator 5 and their independent / symmetrical operation are not particularly limited.

[0108] In the above embodiment, the main controller 31 is configured 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 when moving the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in the second control, but the present invention is not limited to this. In the present invention, the center 42a of the irradiation field 42 of the X-ray image 41 does not have to be aligned 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 on the display unit 40.

[0109] In the above embodiment, the main controller 31, in the second control, enlarges or reduces the size of the adjusted irradiation field 42 so that the screen size of the display unit 40 matches the size of the adjusted irradiation field 42 when the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 is moved, but the present invention is not limited to this. In the present invention, it is not necessary to enlarge or reduce the size of the adjusted irradiation field 42 so that the screen size of the display unit 40 matches the size of the adjusted irradiation field 42.

[0110] In the above embodiment, the main control unit 31 moves the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 in accordance with the movement amount of the shielding blades in the second control, but the present invention is not limited to this. In the present invention, the center 42a of the irradiation field 42 of the X-ray image 41 on the display unit 40 may be moved by a predetermined amount that is set in advance.

[0111] [Aspect] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0112] (Item 1) an imaging unit including an X-ray irradiator that irradiates an object with X-rays and an X-ray detector that detects the X-rays irradiated from the X-ray irradiator; an X-ray image generating unit that generates an X-ray image based on a detection signal detected by the X-ray detecting unit; a tabletop disposed between the X-ray irradiation unit and the X-ray detection unit, on which the subject is placed and which is movable in a horizontal direction; a top plate moving mechanism that moves the top plate; a top board operation unit that receives an operation input for moving the top board; a top plate locking portion that prohibits movement of the top plate; a display unit that displays the X-ray image generated by the X-ray image generation unit; a control unit that controls the movement of the tabletop and controls the display unit to display the X-ray image, The control unit In a first control when the movement of the tabletop is not prohibited by the tabletop locking unit, the tabletop is moved based on an operation input to the tabletop operation unit, An X-ray fluoroscopy device configured to perform a second control when the top plate lock unit prohibits movement of the top plate, in which the second control moves the center of the X-ray irradiation field of the X-ray image on the display unit without moving the top plate based on an operation input to the top plate operation unit.

[0113] (Item 2) Item 1: The X-ray fluoroscopy apparatus according to item 1, wherein the control unit is configured to, in the second control, move the center of the irradiation field of the X-ray image on the display unit in a direction opposite to the direction of movement in the operation input to the tabletop operation unit.

[0114] (Item 3) Further provided is an irradiation field adjusting unit for adjusting the irradiation field of the X-rays, The control unit is configured to, in the second control, move the center of the irradiation field of the X-ray image on the display unit by controlling the irradiation field adjustment unit to adjust the irradiation field based on an operation input to the tabletop operation unit.

[0115] (Item 4) Item 4. The X-ray fluoroscopy apparatus according to item 3, wherein the control unit is configured to align the center of the irradiation field of the X-ray image with the center of the display unit when moving the center of the irradiation field of the X-ray image on the display unit in the second control.

[0116] (Item 5) the irradiation field adjusting unit includes a shielding blade that adjusts the irradiation field by moving in a predetermined direction; Item 3. The X-ray fluoroscopy apparatus according to item 3, wherein the control unit is configured to, in the second control, move the shielding blades to move the center of the irradiation field of the X-ray image on the display unit in a direction opposite to the direction of movement in the operation input to the tabletop operation unit.

[0117] (Item 6) Item 6. The X-ray fluoroscopy apparatus according to item 5, wherein the control unit is configured to, in the second control, move the center of the irradiation field of the X-ray image on the display unit in a direction opposite to the direction of movement in the operation input to the top panel operation unit, depending on the amount of movement of the shielding blade.

[0118] (Item 7) the shielding blades include a first shielding blade that narrows 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 narrows the irradiation field from the second direction toward the first direction, In the second control, the control unit the first shielding blade or the second shielding blade is moved in the second direction based on an operation input in a first direction to the top board operation unit to adjust the irradiation field, thereby moving the center of the irradiation field of the X-ray image on the display unit in the second direction; Item 6. The X-ray fluoroscopy apparatus according to item 5, wherein the first shielding blade or the second shielding blade is moved in the first direction to adjust the irradiation field based on an operation input in a second direction to the tabletop operation unit, thereby moving the center of the irradiation field of the X-ray image on the display unit in the first direction.

[0119] (Item 8) 8. The X-ray fluoroscopic imaging apparatus according to item 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. [Explanation of symbols]

[0120] 1 X-ray fluoroscopy device body 2. Top plate 3 X-ray irradiation section 4 X-ray detection unit 5 Collimator 7 Top plate locking section 8. Imaging unit 11 First shielding blade 12 Second shielding blade 25 Top plate movement mechanism 31 Main control unit 32 X-ray image generation section 40 Display section 40a Center of display 41 X-ray image 42 irradiation field 42a Center of irradiation field 50 Operation Console 51 Top panel operation unit 100 X-ray fluoroscopy equipment

Claims

1. an imaging unit including an X-ray irradiator that irradiates an object with X-rays and an X-ray detector that detects the X-rays irradiated from the X-ray irradiator; an X-ray image generating unit that generates an X-ray image based on a detection signal detected by the X-ray detecting unit; a tabletop disposed between the X-ray irradiation unit and the X-ray detection unit, on which the subject is placed and which is movable in a horizontal direction; a top plate moving mechanism that moves the top plate; a top board operation unit that receives an operation input for moving the top board; a top plate locking portion that prohibits movement of the top plate; a display unit that displays the X-ray image generated by the X-ray image generation unit; a control unit that controls the movement of the tabletop and controls the display unit to display the X-ray image, The control unit In a first control when the movement of the tabletop is not prohibited by the tabletop locking unit, the tabletop is moved based on an operation input to the tabletop operation unit, In a second control when the top lock unit prohibits movement of the top, the center of the X-ray irradiation field of the X-ray image on the display unit is moved without moving the top based on an operation input to the top operation unit, The X-ray fluoroscopic imaging device is configured to move the center of the irradiation field of the X-ray image on the display unit in a direction opposite to a direction of operation input to the top board operation unit in the second control.

2. an irradiation field adjusting unit for adjusting the irradiation field of the X-rays; 2. The X-ray fluoroscopy apparatus according to claim 1, wherein the control unit is configured to, in the second control, perform control to adjust the irradiation field using the irradiation field adjustment unit based on an operation input to the tabletop operation unit, thereby moving the center of the irradiation field of the X-ray image on the display unit.

3. 3. The X-ray fluoroscopic imaging device according to claim 2, wherein the control unit is configured to align the center of the irradiation field of the X-ray image with the center of the display unit when moving the center of the irradiation field of the X-ray image on the display unit in the second control.

4. the irradiation field adjusting unit includes a shielding blade that adjusts the irradiation field by moving in a predetermined direction; 3. The X-ray fluoroscopy apparatus according to claim 2, wherein the control unit is configured to, in the second control, move the shielding blades to move the center of the irradiation field of the X-ray image on the display unit in a direction opposite to a direction of operation input to the tabletop operation unit.

5. 5. The X-ray fluoroscopy apparatus according to claim 4, wherein the control unit is configured to, in the second control, move the center of the irradiation field of the X-ray image on the display unit in a direction opposite to a direction of operation input to the top panel operation unit according to the amount of movement of the shielding blade.

6. the shielding blades include a first shielding blade that narrows 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 narrows the irradiation field from the second direction toward the first direction, In the second control, the control unit the first shielding blade or the second shielding blade is moved in the second direction based on an operation input in a first direction to the top board operation unit to adjust the irradiation field, thereby moving the center of the irradiation field of the X-ray image on the display unit in the second direction; 5. The X-ray fluoroscopy device according to claim 4, wherein the first shielding blade or the second shielding blade is moved in the first direction to adjust the irradiation field based on an operation input in a second direction to the tabletop operation unit, thereby moving the center of the irradiation field of the X-ray image on the display unit in the first direction.

7. The X-ray fluoroscopic imaging apparatus according to claim 6 , wherein the control unit is configured to move only one of the first shielding blade and the second shielding blade in the second control.

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