X-ray imaging device

Abstract

This X-ray imaging device (100) comprises an optical imaging unit (30) and a control unit (32) that generates an enlarged partial image (3). The control unit (32) is configured such that, on the basis of the relationship between the optical axis (5) of the optical imaging unit (30) and an emission axis (6) of X-rays, the center position (3a) of the enlarged partial image (3) is shifted from the center position (2a) of an optical image (2) toward the position, in a real space, of the intersection (4) between an X-ray detection unit (20) and the emission axis (6) of X-rays emitted from an X-ray emission unit (10).

Description

X-ray equipment

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

[0002] 2. Description of the Related Art Conventionally, an X-ray imaging device including an optical imaging unit has been known, and such an X-ray imaging device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2023-104648.

[0003] The X-ray imaging device described in JP 2023-104648 A includes an optical imaging unit provided on the outer surface of a collimator. In this X-ray imaging device, the optical axis of the optical imaging unit and the X-ray irradiation axis are not coaxial. The X-ray imaging device inputs an input image based on an optical image including a subject captured by the optical imaging unit into a trained model and obtains an output result, thereby determining whether a predetermined part of the subject is included in the imaging range of the X-ray image.

[0004] JP 2023-104648 A

[0005] However, in the X-ray imaging device of JP 2023-104648 A, the positions of the subject and the X-ray detection unit in the optical image captured by the optical imaging unit are considered to be offset from the center of the optical image. Here, the photographer adjusts the orientation and position of the subject's body by referring to the optical image displayed on the display unit. In this case, if the distance between the X-ray irradiation unit and the X-ray detection unit is large, the subject appears small in the optical image, making it difficult to see, so it is useful to enlarge the optical image. In this case, when the photographer adjusts the orientation and position of the subject's body based on the enlarged partial image obtained by cropping the optical image using the center of the enlargement center, there is a problem that the subject's area of ​​interest may not be displayed on the display unit due to the area of ​​interest extending outside the enlarged partial image. Therefore, it is desirable to prevent the subject's area of ​​interest from not being displayed on the display unit due to the area of ​​interest extending outside the enlarged partial image.

[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 imaging device that can prevent a region of interest of a subject from not being displayed on a display unit due to the region of interest extending outside an enlarged partial image.

[0007] An X-ray imaging device according to one aspect of the present invention comprises an X-ray irradiation unit including an X-ray tube, an X-ray detection unit that detects X-rays irradiated from the X-ray irradiation unit and transmitted through a subject, an optical imaging unit that has an optical axis shifted with respect to the irradiation axis of the X-rays irradiated from the X-ray irradiation unit and captures an optical image of the subject, a control unit that cuts out a predetermined area from the optical image and generates an enlarged partial image by enlarging it, and a display unit that displays the enlarged partial image generated by the control unit, and the control unit is configured to shift the center position of the enlarged partial image from the center position of the optical image in a direction approaching the position of the intersection in real space between the X-ray detection unit and the irradiation axis of the X-rays irradiated from the X-ray irradiation unit, based on the relationship between the optical axis of the optical imaging unit and the irradiation axis of the X-rays.

[0008] In the X-ray imaging device according to the above aspect, as described above, the control unit is configured to shift the center position of the enlarged partial image from the center position of the optical image toward the intersection in real space between the X-ray detection unit and the irradiation axis of the X-rays irradiated from the X-ray irradiator, based on the relationship between the optical axis of the optical imaging unit and the irradiation axis of the X-rays. This allows the center position of the enlarged partial image to be closer to the intersection between the X-ray detection unit and the irradiation axis of the X-rays, so that the X-ray detector and the subject can be displayed more centrally in the enlarged partial image than when the center position of the enlarged partial image is the center position of the optical image. This makes it possible to prevent the region of interest of the subject from being hidden from the display unit due to the region of interest extending outside the enlarged partial image.

[0009] FIG. 1 is a schematic diagram showing the overall configuration of an X-ray imaging apparatus according to an embodiment. FIG. 2 is a block diagram showing the overall configuration of an X-ray imaging apparatus according to an embodiment. FIG. 3 is a schematic diagram showing the configuration of a holding unit according to an embodiment. FIG. 4 is a schematic diagram showing an enlarged partial image displayed on a display operation unit. FIG. 5 is a schematic diagram showing a re-enlarged partial image and an enlarged partial reduced image displayed on a display operation unit. FIG. 6 is a schematic diagram for explaining acquisition of the center position of an enlarged partial image by an optical imaging control unit. FIG. 7 is a schematic diagram showing an optical image displayed on a display operation unit and an enlarged partial image in a first display form. FIG. 8 is a schematic diagram for explaining adjustment of a magnification ratio for generating an enlarged partial image by an optical imaging control unit. FIG. 9 is a schematic diagram showing an optical image displayed on a display operation unit and an enlarged partial image in a second display form.

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

[0011] (Configuration of X-Ray Imaging Apparatus) The configuration of an X-ray imaging apparatus 100 according to an embodiment of the present invention will be described with reference to FIGS.

[0012] FIG. 1 shows an example of a ceiling-suspended X-ray imaging device 100 installed in an imaging room 110. The X-ray imaging device 100 includes an X-ray irradiator 10, an X-ray detector 20, an optical imaging unit 30, a display / operation unit 41, a holder 40, a movement mechanism 50, an apparatus controller 60, and an input unit 61. In the ceiling-suspended X-ray imaging device 100, a holder 40 provided with the X-ray irradiator 10 and the optical imaging unit 30 is suspended from the ceiling by a movement mechanism 50 arranged on the ceiling of the imaging room 110. The holder 40 is movably held within the imaging room 110 by the movement mechanism 50. The vertical (perpendicular) direction is defined as the Z direction, and two mutually orthogonal horizontal directions are defined as the X direction and the Y direction. The display / operation unit 41 is an example of the "display unit" and "operation unit" in the claims.

[0013] The X-ray imaging device 100 is a medical X-ray imaging device configured to perform X-ray imaging of a subject 1, which is the imaging target. The X-ray imaging device 100 includes an imaging table 21 for imaging the subject 1 in a lying position (supine position), and an imaging stand 22 for imaging the subject 1 in an upright position (standing position).

[0014] The X-ray irradiation unit 10 includes an X-ray tube 11, a collimator unit 12, and an irradiation field lamp 13 (see FIG. 3 ). The X-ray tube 11 is configured to irradiate the subject 1 with X-rays. The X-ray tube 11 is configured to irradiate X-rays by applying a predetermined voltage. The collimator unit 12 has a plurality of position-adjustable shielding plates (collimator leaves). The collimator unit 12 is configured to adjust the irradiation field of the X-rays irradiated from the X-ray tube 11 by blocking a portion of the X-rays from the X-ray tube 11. The collimator unit 12 is provided near the X-ray tube 11 in the X-ray irradiation direction of the X-ray tube 11. The collimator unit 12 is provided with an irradiation field lamp 13. The irradiation field lamp 13 includes a light source of visible light. The visible light irradiated from the irradiation field lamp 13 allows the X-ray irradiation field to be confirmed without using X-rays.

[0015] An X-ray detection unit 20 is movably held by each of the radiography table 21 and the radiography stand 22. The X-ray detection unit 20 includes, for example, a flat panel detector (FPD). The X-ray detection unit 20 is configured to detect X-rays that have passed through the subject 1. The movement mechanism 50 is capable of moving the holding unit 40 at least between an imaging position in a supine position using the radiography table 21 (see the solid line in FIG. 1 ) and an imaging position in an upright position using the radiography stand 22 (see the two-dot chain line in FIG. 1 ).

[0016] In X-ray imaging in a lying position, the holding unit 40 is arranged at a position vertically facing the X-ray detection unit 20 of the imaging table 21, and the subject 1 lying on the imaging table 21 is imaged between the vertically facing X-ray irradiation unit 10 and X-ray detection unit 20. In X-ray imaging in a standing position, the holding unit 40 is arranged at a position horizontally facing the X-ray detection unit 20 of the imaging stand 22, and the subject 1 standing in front of the imaging stand 22 is imaged between the horizontally facing X-ray irradiation unit 10 and X-ray detection unit 20.

[0017] The optical imaging unit 30 is configured to capture an optical image 2 (see FIG. 7). The optical imaging unit 30 is, for example, an optical camera.

[0018] In X-ray imaging in a lying position, the holding unit 40 is arranged at a position vertically facing the X-ray detection unit 20 of the imaging table 21, and the subject 1 lying on the imaging table 21 is imaged by the optical imaging unit 30 between the X-ray irradiation unit 10 and the X-ray detection unit 20 that are vertically facing each other. In X-ray imaging in a standing position, the holding unit 40 is arranged at a position horizontally facing the X-ray detection unit 20 of the imaging stand 22, and the subject 1 standing in front of the imaging stand 22 is imaged by the optical imaging unit 30 between the X-ray irradiation unit 10 and the X-ray detection unit 20 that are horizontally facing each other.

[0019] 1 , the optical imaging unit 30 is provided on the outer surface of the collimator unit 12. In this embodiment, the optical imaging unit 30 is provided on the outer surface of the collimator unit 12 on the longitudinal side of the imaging table 21 when the patient is in a lying position. Furthermore, the optical imaging unit 30 is provided on the outer surface of the collimator unit 12 on the lateral side that intersects with the detection surface of the X-ray detection unit 20 when the patient is in an upright position. The optical imaging unit 30 is provided facing the irradiation direction of X-rays from the X-ray irradiation unit 10.

[0020] 6 , the optical imaging unit 30 is configured to have an optical axis 5 that is offset from the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. In other words, the optical imaging unit 30 is configured to have an optical axis 5 that is not coaxial with the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. The optical imaging unit 30 is also configured to have an optical axis 5 that is approximately parallel to the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. When the X-ray irradiator 10 faces the subject 1 and the X-ray detection unit 20, the optical imaging unit 30 can capture an optical image 2 of the subject 1 and the X-ray detection unit 20 from the X-ray irradiator 10 side. The imaging range of the optical imaging unit 30 is set to include the range of the X-ray irradiation field and to be larger than the range of the X-ray irradiation field.

[0021] The optical imaging unit 30 can capture an optical image 2 including a visible light region 8 (see FIG. 4) formed by visible light irradiated from the irradiation field lamp 13 (see FIG. 3) and the peripheral portion of the visible light region 8. The range of the visible light region 8 formed by the visible light irradiated from the irradiation field lamp 13 substantially coincides with the range of the X-ray irradiation field. As will be described in detail later, an enlarged partial image 3 (see FIG. 4) obtained by cutting out and enlarging a predetermined region 7 from the optical image 2 is displayed on the display operation unit 41. By using the visible light irradiated from the irradiation field lamp 13, the X-ray irradiation field can be confirmed based on the enlarged partial image 3 without irradiating X-rays.

[0022] 2, the optical imaging unit 30 includes an imaging element 31 and an optical imaging control unit 32. The optical imaging unit 30 is, for example, an optical camera. The optical imaging control unit 32 is an example of the "control unit" in the claims.

[0023] The imaging element 31 includes, for example, a charge coupled device (CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor.

[0024] The optical imaging control unit 32 is, for example, a microcomputer including a CPU (Central Processing Unit), a memory, etc. The optical imaging control unit 32 is configured to receive the signal output from the imaging element 31 and generate an optical image 2 based on the input signal. The optical imaging control unit 32 is also configured to generate an enlarged partial image 3 by cutting out a predetermined region 7 from the generated optical image 2 and enlarging it.

[0025] The optical imaging control unit 32 is configured to shift the center position 3a of the enlarged partial image 3 from the center position 2a of the optical image 2 in a direction approaching the position of intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10, based on the relationship between the optical axis 5 of the optical imaging unit 30 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. Here, the direction approaching the position of intersection 4 is the direction in which the optical imaging unit 30 and the X-ray irradiator 10 are aligned. Note that the control of the optical imaging control unit 32 to obtain the center position 3a of the enlarged partial image 3 will be described later.

[0026] Furthermore, the optical imaging control unit 32 is configured to display the range of a predetermined region 7 in the optical image 2 as the enlarged partial image 3 on the display operation unit 41 based on a preset magnification ratio as a first display form of the enlarged partial image 3. Note that the control of the first display form of the enlarged partial image 3 by the optical imaging control unit 32 will be described later.

[0027] Furthermore, as a second display form of the enlarged partial image 3, the optical imaging control unit 32 is configured to adjust the magnification ratio for generating the enlarged partial image 3, thereby causing the display operation unit 41 to display the entire range of the predetermined area 7, which is set in advance based on the size of the X-ray detection unit 20 in real space, as the enlarged partial image 3. Note that the control of the second display form of the enlarged partial image 3 by the optical imaging control unit 32 will be described later.

[0028] In addition, the optical imaging control unit 32 is configured to generate a re-enlarged partial image 70 (see Figure 5(a)) that is a further enlargement of the enlarged partial image 3 displayed on the display operation unit 41, or a reduced enlarged partial image 71 (see Figure 5(b)) that is a reduction of the enlarged partial image 3 displayed on the display operation unit 41, based on an input operation to the display operation unit 41, and display it on the display operation unit 41.

[0029] As shown in Fig. 1, the holding unit 40 holds the X-ray irradiation unit 10. As shown in Fig. 4, the holding unit 40 includes the X-ray irradiation unit 10, the optical imaging unit 30, a display operation unit 41, and a grip unit 43. The holding unit 40 is configured to be movable in the horizontal and vertical directions via a movement mechanism 50, either manually or under the control of the device control unit 60.

[0030] The display operation unit 41 includes, for example, a touch panel type liquid crystal display, and is configured to function as an image display unit that displays the optical image 2 (see FIG. 7) captured by the optical imaging unit 30, the enlarged partial image 3 (see FIG. 4) generated by the optical imaging control unit 32, and shooting information, as well as function as an operation unit into which various operations by the photographer are input.

[0031] The display operation unit 41 includes an operation unit having a first enlargement operation unit 44, a second enlargement operation unit 45, a fine adjustment enlargement operation unit 46, and a fine adjustment reduction operation unit 47. The fine adjustment enlargement operation unit 46 and the fine adjustment reduction operation unit 47 are examples of the "operation unit" in the claims.

[0032] The first enlargement operation unit 44 is configured to receive an operation input for displaying the enlarged partial image 3 in the first display form on the display operation unit 41. The second enlargement operation unit 45 is configured to receive an operation input for displaying the enlarged partial image 3 in the second display form on the display operation unit 41.

[0033] The fine-tuning enlargement operation unit 46 and the fine-tuning reduction operation unit 47 are configured to receive an input operation for finely adjusting the magnification rate of the enlarged partial image 3. Specifically, the fine-tuning enlargement operation unit 46 is configured to receive an operation input for displaying, on the display operation unit 41, a re-enlarged partial image 70 (see FIG. 5A) obtained by enlarging the enlarged partial image 3 (see FIG. 4). The fine-tuning reduction operation unit 47 is configured to receive an operation input for displaying, on the display operation unit 41, a magnified partial reduced image 71 (see FIG. 5B) obtained by reducing the enlarged partial image 3 (see FIG. 4).

[0034] The grip portion 43 is provided for an operator to grip when manually moving the holding portion 40. The grip portion 43 transmits the operating force of the operator to the holding portion 40.

[0035] As shown in FIG. 1 , the movement mechanism 50 is configured to hold the holding unit 40 so that it can move horizontally (X direction and Y direction) and vertically (Z direction). The movement mechanism 50 includes a ceiling suspension unit 51 and a support unit 52. The movement mechanism 50 is supported by rails 53 provided on the ceiling of the radiography room 110. The ceiling suspension unit 51 is configured to be movable in the horizontal direction by the rails 53. The ceiling suspension unit 51 is configured to support the support unit 52. The support unit 52 is configured to support the holding unit 40. The support unit 52 is configured to be extendable and retractable in the vertical direction. The holding unit 40 is configured to be movable in the vertical direction by the support unit 52.

[0036] The device control unit 60 controls X-ray imaging by the X-ray irradiation unit 10 and the X-ray detection unit 20, and controls the movement of the holding unit 40. The device control unit 60 includes a CPU (Central Processing Unit) and a memory 60a.

[0037] The input unit 61 has a function of accepting input operations related to X-ray imaging, such as setting imaging conditions for X-ray imaging and issuing an instruction to start X-ray irradiation.

[0038] (Control of Acquisition of Center Position of Enlarged Partial Image by Optical Imaging Control Unit) Control of acquisition of center position 3a of enlarged partial image 3 by optical imaging control unit 32 will be described with reference to FIG.

[0039] When an input operation of either the first enlargement operation unit 44 or the second enlargement operation unit 45 in the display operation unit 41 and an input operation of X-ray imaging conditions such as the imaging region and surgical procedure in the display operation unit 41 are accepted, the optical imaging control unit 32 generates an enlarged partial image 3 by cutting out and enlarging a predetermined area 7 from the optical image 2. In generating the enlarged partial image 3, the optical imaging control unit 32 shifts the center position 3a of the enlarged partial image 3 from the center position 2a of the optical image 2 in a direction approaching the position of intersection 4 in real space between the X-ray detection unit and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiation unit.

[0040] Based on the relationship between the optical axis 5 of the optical imaging unit 30 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10, the optical imaging control unit 32 sets the center position 3a of the enlarged partial image 3 to a position shifted from the center position 2a of the optical image 2 in a direction approaching the position of intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator. In this embodiment, the optical imaging control unit 32 sets the center position 3a of the enlarged partial image 3 to a position substantially coinciding with the position of intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10.

[0041] Examples of the relationship between the optical axis 5 of the optical imaging unit 30 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiation unit 10 include the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, the distance D1 between the irradiation axis 6 of the X-rays and the optical axis 5 of the optical imaging unit 30, and the angle of view θ of the optical imaging unit 30.

[0042] The distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is set in advance for each imaging region and is stored in the memory 60a of the device control unit 60 in association with the imaging region. The distance D1 between the X-ray irradiation axis 6 and the optical axis 5 of the optical imaging unit 30, and the angle of view θ of the optical imaging unit 30 are also stored in advance in the memory 60a of the device control unit 60. The optical imaging control unit 32 acquires the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, the distance D1 between the X-ray irradiation axis 6 and the optical axis 5 of the optical imaging unit 30, and the angle of view θ of the optical imaging unit 30, which are stored in the memory 60a. The optical imaging control unit 32 may be configured to acquire, from the device control unit 60, the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, which is acquired by the device control unit 60 based on the detected three-dimensional positional relationship between the optical imaging unit 30 and the X-ray detection unit 20.

[0043] 6 , the optical imaging control unit 32 acquires a center position shift rate S based on the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, the distance D1 between the X-ray irradiation axis 6 and the optical axis 5 of the optical imaging unit 30, and the angle of view θ of the optical imaging unit 30, in order to move the center position 3a of the enlarged partial image 3 from the center position 2a of the optical image 2 to a position that substantially coincides with the position of the intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. The “center position shift rate S” is the ratio of the distance D1 between the X-ray irradiation axis 6 and the optical axis 5 of the optical imaging unit 30 to the length L2 in real space of the imaging range included in the angle of view θ in the plane direction of the X-ray detection unit 20, which includes the intersection 4 between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. The center position shift rate S is expressed by the following formula (1).

[0044] The optical imaging control unit 32 then acquires the center position 3a of the enlarged partial image 3 based on the acquired center position shift rate S. Specifically, the optical imaging control unit 32 acquires, as the center position 3a of the enlarged partial image 3, a position shifted from the center position 2a of the optical image 2 in a direction approaching the position of the intersection 4 by the number of pixels obtained by multiplying the number of pixels in the optical image 2 in a direction approaching the position of the intersection 4 by the acquired center position shift rate S. As a result, the center position 3a of the acquired enlarged partial image 3 becomes a position that substantially coincides with the position of the intersection 4.

[0045] As an example, if the number of pixels in the direction approaching the position of the intersection 4 in the optical image 2 is 960 and the number of pixels in the direction perpendicular to the direction approaching the position of the intersection 4 in the optical image 2 is 1280, the position shifted from the center position 2a of the optical image 2 in the direction approaching the position of the intersection 4 by the number of pixels obtained by multiplying the number of pixels 960 in the direction approaching the position of the intersection 4 in the optical image 2 by the center position shift rate S is obtained as the center position 3a of the enlarged partial image 3.

[0046] Then, the optical imaging control unit 32 generates an enlarged partial image 3 by cutting out a predetermined area 7 from the optical image based on the center position 3 a of the acquired enlarged partial image 3 .

[0047] (Control of First Display Form of Enlarged Partial Image by Optical Imaging Control Unit) With reference to Figures 7(a) to 7(c), the control of the first display form of the enlarged partial image 3 by the optical imaging control unit 32 will be described. Here, the control of the first display form of the enlarged partial image 3 by the optical imaging control unit 32 when X-ray imaging is performed with the subject 1 in an upright position (standing position) will be described. Note that in Figures 7(a) to 7(c), for the sake of convenience of explanation, the range of the predetermined area 7 is indicated by a dashed line. Furthermore, the above control when X-ray imaging is performed with the subject 1 lying on the imaging table 21 (supine position) is similar control, and therefore a description thereof will be omitted.

[0048] When an input operation of the first enlargement operation unit 44 in the display operation unit 41 and an input operation of X-ray imaging conditions such as the imaging region and surgical procedure in the display operation unit 41 are accepted, the optical imaging control unit 32 causes the display operation unit 41 to display the range of the predetermined region 7 in the optical image 2 as the enlarged partial image 3 based on the center position 3a of the acquired enlarged partial image 3 and a preset magnification rate. The optical imaging control unit 32 switches the optical image 2 displayed on the display operation unit 41 to the enlarged partial image 3 and displays it on the display operation unit 41.

[0049] The magnification ratio of the range of the predetermined region 7 in the optical image 2 is set in advance for each imaging region and is stored in the memory 60a of the device control unit 60 in association with the imaging region. The optical imaging control unit 32 acquires the magnification ratio corresponding to the imaging region stored in the memory 60a. As an example, when the imaging region is the chest, the magnification ratio of the range of the predetermined region 7 in the optical image 2 is 2.0 times. As another example, when the imaging region is the head, the magnification ratio of the range of the predetermined region 7 in the optical image 2 is 1.5 times. The magnification ratio of the range of the predetermined region 7 in the optical image 2 may be set by the photographer, or the magnification ratio set by the photographer may be changed and reset, or it may be set at the time of shipping from the factory.

[0050] Here, the aspect ratio of the range of the predetermined area 7 in the optical image 2 is configured to match the aspect ratio of the image display section of the display operation section 41. Therefore, the range of the predetermined area 7 in the optical image 2 is uniquely acquired based on the center position 3a of the acquired enlarged partial image 3 and a preset magnification ratio.

[0051] 7(a) to 7(c) are schematic diagrams showing an optical image 2 displayed on the display operation unit 41 and an enlarged partial image 3 displayed on the display operation unit 41 when the imaging region is the chest. In all of FIGS. 7(a) to 7(c), the preset magnification ratio of the range of the predetermined region 7 in the optical image 2 is 2.0 times. In FIG. 7(a), the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is 100 cm. In FIG. 7(b), the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is 150 cm. In FIG. 7(c), the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is 200 cm.

[0052] 7( a) to 7(c), if the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 varies, the position of the range of the predetermined region 7 in the optical image 2 also varies. In other words, if the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 varies, the position of the region cut out as the enlarged partial image 3 in the optical image 2 also varies. Furthermore, the shorter the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, the greater the distance between the center position 2a of the optical image 2 and the position of the intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. The enlarged partial image 3 generated by the optical imaging control unit 32 and displayed on the display operation unit 41 is an image obtained by cutting out a predetermined area 7 from the optical image 2 and enlarging it, with the center position 3a of the acquired enlarged partial image 3 being the cutout center and enlargement center, and the center position 3a of the enlarged partial image 3 is located at a position that approximately coincides with the position of the intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiation unit 10.

[0053] (Control of the second display form of the enlarged partial image by the optical imaging control unit) Control of the second display form of the enlarged partial image 3 by the optical imaging control unit 32 will be described with reference to Fig. 8 and Figs. 9(a) to 9(b). Here, control of the second display form of the enlarged partial image 3 by the optical imaging control unit 32 will be described when X-ray imaging is performed with the subject 1 in an upright position (standing position). Note that, for the sake of convenience of explanation, the range of the predetermined area 7 is indicated by a dashed line in Figs. 9(a) to 9(c). Furthermore, the above control when X-ray imaging is performed with the subject 1 lying on the imaging table 21 (supine position) is similar control, and therefore will not be described again.

[0054] When an input operation of the second enlargement operation unit 45 in the display operation unit 41 and an input operation of X-ray imaging conditions such as the imaging region and surgical procedure in the display operation unit 41 are accepted, the optical imaging control unit 32 causes the display operation unit 41 to display the entire range of the predetermined area 7 in the optical image 2 as the enlarged partial image 3 based on the center position 3a of the acquired enlarged partial image 3 and the range of the predetermined area 7 that is set in advance based on the size of the X-ray detection unit 20 in real space. The optical imaging control unit 32 switches the optical image 2 displayed on the display operation unit 41 to the enlarged partial image 3 and causes the display operation unit 41 to display the enlarged partial image 3.

[0055] The range of the predetermined region 7 in the optical image 2 is set in advance by the photographer for each imaging region based on the size of the X-ray detection unit in real space, and is associated with the imaging region and stored in the memory 60a of the device control unit 60. The optical imaging control unit 32 acquires the range of the predetermined region 7 corresponding to the imaging region stored in the memory 60a.

[0056] 8 , for example, in the case of an optical image 2 in which the imaging region is the chest, a range P1 in the left-right direction within the predetermined region 7 can be set in advance between a position 10 cm to the left of the left side of the X-ray detection unit 20 in real space and a position 10 cm to the right of the right side of the X-ray detection unit 20 in real space. Here, the aspect ratio of the predetermined region 7 in the optical image 2 is configured to match the aspect ratio of the image display unit of the display operation unit 41. Therefore, the range of the predetermined region 7 in the optical image 2 is uniquely acquired based on the center position 3 a of the acquired enlarged partial image 3 and the set range P1 in the left-right direction within the predetermined region 7 in the optical image 2.

[0057] The optical imaging control unit 32 then adjusts the magnification ratio for generating the enlarged partial image 3. Specifically, the optical imaging control unit 32 acquires an adjusted magnification ratio M for generating the enlarged partial image 3 based on, for example, the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, the angle of view θ of the optical imaging unit 30, and a horizontal range P1 within the range of the predetermined region 7 that is set in advance based on the size of the X-ray detection unit 20 in real space. The "adjusted magnification ratio M" is the reciprocal of the ratio of the length of the horizontal range P1 within the range of the predetermined region 7 that is set in advance based on the size of the X-ray detection unit 20 in real space to the length L2 of the imaging range included in the angle of view θ in the plane direction of the X-ray detection unit 20 that includes the intersection 4 between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. The adjusted magnification ratio M is expressed by the following formula (2):

[0058] Then, the optical imaging control unit 32 displays the entire range of the specified area 7 in the optical image 2 as an enlarged partial image 3 on the display operation unit 41 based on the acquired adjusted magnification ratio M, the center position 3a of the acquired enlarged partial image 3, and the range of the specified area 7 that has been set in advance based on the size of the X-ray detection unit 20 in real space.

[0059] 9(a) to 9(c) are schematic diagrams showing an optical image 2 displayed on the display operation unit 41 and an enlarged partial image 3 displayed on the display operation unit 41 when the imaging site is the chest. In all of Fig. 9(a) to 9(c), the horizontal range of the predetermined region 7, which is set in advance, is the range between a position 10 cm to the left of the left side of the X-ray detection unit 20 in real space and a position 10 cm to the right of the right side of the X-ray detection unit 20 in real space. For ease of explanation, the range of the predetermined region 7 is indicated by a dashed line in the optical image 2.

[0060] 9( a) to 9(c), even if the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is different, the region cut out as the enlarged partial image 3 in the optical image 2 is substantially the same. That is, even if the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is different, the range of the enlarged partial image 3 displayed on the display operation unit 41 is substantially the same. Furthermore, the enlarged partial image 3 generated by the optical imaging control unit 32 and displayed on the display unit is an image obtained by cutting out a predetermined region 7 from the optical image 2 and enlarging it, using the center position 3a of the acquired enlarged partial image 3 as the cutout center and enlargement center, and the center position 3a of the enlarged partial image 3 is located at a position substantially coinciding with the position of the intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10.

[0061] (Re-enlarged partial image and enlarged partial reduced image) As shown in Figure 5 (a), the optical imaging control unit 32 generates a re-enlarged partial image 70 that is further enlarged from the enlarged partial image 3 displayed on the display operation unit 41 based on an input operation to the fine adjustment enlargement operation unit 46 (see Figure 2) of the display operation unit 41, and displays the generated re-enlarged partial image 70 on the display operation unit 41.

[0062] Also, as shown in Figure 5 (b), the optical imaging control unit 32 generates an enlarged portion reduced image 71 by reducing the enlarged portion image 3 displayed on the display operation unit 41 based on an input operation to the fine adjustment reduction operation unit 47 (see Figure 2) of the display operation unit 41, and displays the generated enlarged portion reduced image 71 on the display operation unit 41.

[0063] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0064] In the present embodiment, as described above, the optical imaging control unit 32 is configured to shift the center position 3 a of the enlarged partial image 3 from the center position 2 a of the optical image 2 in a direction toward the intersection 4 in real space between the X-ray detection unit 20 and the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10, based on the relationship between the optical axis 5 of the optical imaging unit 30 and the X-ray irradiation axis 6. This allows the center position 3 a of the enlarged partial image 3 to be closer to the intersection 4 between the X-ray detection unit 20 and the X-ray irradiation axis 6, so that the X-ray detection unit 20 and the subject 1 can be displayed more centrally in the enlarged partial image 3 than when the center position 3 a of the enlarged partial image 3 is the center position 2 a of the optical image 2. This makes it possible to prevent the region of interest of the subject 1 from being displayed on the display operation unit 41 due to the region of interest extending outside the enlarged partial image 3.

[0065] Furthermore, in this embodiment, the following additional effects can be obtained by the following configuration.

[0066] That is, in this embodiment, as described above, the optical imaging control unit 32 is configured to shift the center position 3 a of the enlarged partial image 3 toward the position of the intersection 4 based on the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, the distance D1 between the X-ray irradiation axis 6 and the optical axis 5 of the optical imaging unit 30, and the angle of view θ of the optical imaging unit 30. As a result, even if the optical imaging unit 30 has an optical axis that is shifted with respect to the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10, the center position 3 a of the enlarged partial image 3 can be easily obtained based on the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20, the distance D1 between the X-ray irradiation axis 6 and the optical axis 5 of the optical imaging unit 30, and the angle of view θ of the optical imaging unit 30. Therefore, the X-ray detection unit 20 and the subject 1 can be easily displayed more centrally in the enlarged partial image 3. As a result, it is easy to prevent the region of interest of the subject 1 from being displayed on the display operation unit 41 due to the region of interest extending outside the enlarged partial image 3.

[0067] Furthermore, in this embodiment, as described above, the optical imaging unit 30 is configured to have the optical axis 5 that is approximately parallel to the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10. This makes it possible to prevent the subject 1 from appearing distorted in the optical image 2 due to the optical axis 5 of the optical imaging control unit 32 being inclined with respect to the irradiation axis 6 of the X-rays irradiated from the X-ray irradiator 10, and therefore makes it possible to prevent the subject 1 from appearing distorted in the enlarged partial image 3 as well.

[0068] Furthermore, in this embodiment, as described above, the optical imaging control unit 32 is configured to display the range of the predetermined region 7 in the optical image 2 as the enlarged partial image 3 on the display operation unit 41 based on a preset magnification ratio. This allows the photographer to easily adjust the orientation and position of the body of the subject 1 based on the enlarged partial image 3 obtained by enlarging the optical image 2 at a desired preset magnification ratio.

[0069] Furthermore, in this embodiment, as described above, the optical imaging control unit 32 is configured to display the range of the predetermined region 7 in the optical image 2 as the enlarged partial image 3 on the display operation unit 41 based on a magnification ratio preset for each imaging region. Here, in adjusting the orientation and position of the body of the subject 1, if the imaging region is the head, the set distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is small (short), so a small magnification ratio of the enlarged partial image 3 is preferable. However, if the imaging region is the chest, the set distance L1 between the optical imaging unit 30 and the X-ray detection unit 20 is large (long), so a large magnification ratio of the enlarged partial image 3 is preferable. Therefore, by displaying the enlarged partial image 3 on the display operation unit 41 based on a magnification ratio preset for each imaging region, the photographer can easily adjust the orientation and position of the body of the subject 1 based on the enlarged partial image 3 at a magnification ratio appropriate for the imaging region.

[0070] Furthermore, in this embodiment, as described above, the optical imaging control unit 32 is configured to adjust the magnification ratio for generating the magnified partial image 3, thereby causing the display operation unit 41 to display the entire range of the predetermined region 7, which is set in advance based on the size of the X-ray detection unit 20 in real space, as the magnified partial image 3. As a result, since the range of the predetermined region 7 is set in advance based on the size of the X-ray detection unit 20 in real space, the display operation unit 41 can display the magnified partial image 3 of approximately the same range regardless of the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20. Therefore, the photographer can more easily adjust the orientation and position of the body of the subject 1 based on the magnified partial image 3 of approximately the same range regardless of the distance L1 between the optical imaging unit 30 and the X-ray detection unit 20.

[0071] Furthermore, in this embodiment, as described above, the optical imaging control unit 32 is configured to display, on the display operation unit 41, the entire range of the predetermined region 7, which is set in advance for each imaging region based on the size of the X-ray detection unit 20 in real space, as the enlarged partial image 3. As a result, since the range of the predetermined region 7 is set in advance for each imaging region, the photographer can easily adjust the orientation and position of the body of the subject 1 based on the enlarged partial image 3 based on the range of the predetermined region 7 appropriate for each imaging region.

[0072] Furthermore, in this embodiment, as described above, the display operation unit 41 includes a fine-adjustment enlargement operation unit 46 and a fine-adjustment reduction operation unit 47 that accept an input operation for finely adjusting the magnification rate of the enlarged partial image 3, and the optical imaging control unit 32 is configured to generate a re-enlarged partial image 70 obtained by further enlarging the enlarged partial image 3 displayed on the display operation unit 41, or a magnified partial reduced image 71 obtained by reducing the enlarged partial image 3 displayed on the display unit, based on an input operation to the fine-adjustment enlargement operation unit 46 or the fine-adjustment reduction operation unit 47, and display the re-enlarged partial image 70 on the display operation unit 41. In this way, by finely adjusting the enlarged partial image 3, the photographer can more easily fine-tune the orientation and position of the body of the subject 1 based on the re-enlarged partial image 70 obtained by further enlarging the enlarged partial image 3, or the magnified partial reduced image 71 obtained by reducing the enlarged partial image 3.

[0073] Furthermore, in this embodiment, as described above, the optical imaging control unit 32 is configured to set the center position 3a of the enlarged partial image 3 to a position that substantially coincides with the position of the intersection 4, based on the relationship between the optical axis 5 of the optical imaging unit 30 and the X-ray irradiation axis 6. This makes it possible to easily display the X-ray detection unit 20 and the subject 1 in the center of the enlarged partial image 3, and more effectively prevents the target area of ​​the subject 1 from not being displayed on the display operation unit 41 due to the target area extending outside the enlarged partial image 3.

[0074] [Modifications] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the description of the above-mentioned embodiments, and further includes all modifications (modifications) within the meaning and scope of the claims.

[0075] For example, in the above embodiment, an example was shown in which the optical imaging control unit including a microcomputer is configured to cut out a predetermined area from an optical image and generate an enlarged partial image by enlarging it, but the present invention is not limited to this. For example, a device control unit that controls X-ray imaging may be configured to cut out a predetermined area from an optical image and generate an enlarged partial image by enlarging it.

[0076] In the above embodiment, the optical imaging control unit is configured to set the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection in real space between the X-ray detection unit and the irradiation axis of the X-rays irradiated from the X-ray irradiation unit, but the present invention is not limited to this. For example, the optical imaging control unit may be configured to set the center position of the enlarged partial image to a position that is at least shifted from the center position of the optical image in a direction approaching the position of the intersection, rather than shifting the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection.

[0077] In the above embodiment, the optical imaging control unit is configured to have an optical axis that is approximately parallel to the irradiation axis of the X-rays irradiated from the X-ray irradiator, but the present invention is not limited to this. For example, the optical axis of the optical imaging control unit may be configured to be inclined with respect to the irradiation axis of the X-rays irradiated from the X-ray irradiator.

[0078] In the above embodiment, the optical imaging control unit is configured to set the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection in real space between the X-ray detection unit and the irradiation axis of the X-rays irradiated from the X-ray irradiation unit, based on the distance between the X-ray irradiator and the X-ray detection unit, the distance between the X-ray irradiation axis and the optical axis of the optical imaging unit, and the angle of view of the optical imaging unit. However, the present invention is not limited to this. For example, the optical imaging control unit may be configured to set the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection based on a combination of two of the distance between the X-ray irradiator and the X-ray detection unit, the distance between the X-ray irradiation axis and the optical axis of the optical imaging unit, and the angle of view of the optical imaging unit, or may be configured to set the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection based on a combination of four or more parameters added.

[0079] In the above embodiment, the optical imaging control unit is configured to set the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection based on the above formula (1), but the present invention is not limited to this. For example, the optical imaging control unit may be configured to set the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection based on a formula other than the above formula (1).

[0080] In the above embodiment, the optical imaging control unit is configured to cause the display operation unit to display a predetermined region of the optical image as an enlarged partial image based on a magnification factor preset for each imaging region, but the present invention is not limited to this. For example, the optical imaging control unit may be configured to cause the display operation unit to display a predetermined region of the optical image as an enlarged partial image based on a surgical procedure or a distance between the X-ray irradiator and the X-ray detector, or may be configured to cause the display operation unit to display a predetermined region of the optical image as an enlarged partial image based on a magnification factor preset based on at least two combinations of a surgical procedure, a distance between the X-ray irradiator and the X-ray detector, and a region of the imaging region, a surgical procedure, and a distance between the X-ray irradiator and the X-ray detector.

[0081] In addition, in the above embodiment, an example was shown in which the optical imaging control unit is configured to cause the display operation unit to display an enlarged partial image of the entire range of a predetermined region that is preset for each imaging region based on the size of the X-ray detection unit in real space, but the present invention is not limited to this. For example, the optical imaging control unit may be configured to cause the display operation unit to display an enlarged partial image of the entire range of a predetermined region that is preset for each surgical procedure based on the size of the X-ray detection unit in real space, or may be configured to cause the display operation unit to display an enlarged partial image of the entire range of a predetermined region that is preset for each combination of imaging region and surgical procedure based on the size of the X-ray detection unit in real space.

[0082] In the above embodiment, the optical imaging control unit adjusts the magnification ratio for generating the enlarged partial image based on the above formula (2), but the present invention is not limited to this. For example, the optical imaging control unit may be configured to adjust the magnification ratio for generating the enlarged partial image based on a formula other than the above formula (2).

[0083] Aspects It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0084] an X-ray irradiation unit including an X-ray tube; an X-ray detection unit that detects X-rays irradiated from the X-ray irradiation unit and transmitted through a subject; an optical imaging unit that has an optical axis shifted with respect to the irradiation axis of the X-rays irradiated from the X-ray irradiation unit and captures an optical image of the subject; a control unit that generates an enlarged partial image by cutting out and enlarging a predetermined area from the optical image; and a display unit that displays the enlarged partial image generated by the control unit, wherein the control unit is configured to shift the center position of the enlarged partial image from the center position of the optical image in a direction approaching the position of the intersection in real space between the X-ray detection unit and the irradiation axis of the X-rays irradiated from the X-ray irradiation unit, based on the relationship between the optical axis of the optical imaging unit and the irradiation axis of the X-rays.

[0085] (Item 2) The X-ray imaging device according to Item 1, wherein the control unit is configured to shift the center position of the enlarged partial image in a direction approaching the position of the intersection based on the distance between the optical imaging unit and the X-ray detection unit, the distance between the X-ray irradiation axis and the optical axis of the optical imaging unit, and the angle of view of the optical imaging unit.

[0086] (Item 3) The X-ray imaging apparatus according to item 1 or 2, wherein the optical imaging unit is configured to have an optical axis that is substantially parallel to an irradiation axis of the X-rays irradiated from the X-ray irradiator.

[0087] (Item 4) The X-ray imaging device according to any one of Items 1 to 3, wherein the control unit is configured to cause the display unit to display the range of the predetermined region in the optical image as the enlarged partial image based on a preset magnification ratio.

[0088] (Item 5) The X-ray imaging device according to Item 4, wherein the control unit is configured to cause the display unit to display the range of the specified region in the optical image as the enlarged partial image based on the magnification ratio that is preset based on at least one of each imaging region, each surgical procedure, and each distance between the X-ray irradiation unit and the X-ray detection unit.

[0089] (Item 6) The X-ray imaging device according to any one of Items 1 to 5, wherein the control unit is configured to adjust the magnification ratio for generating the magnified partial image, thereby causing the display unit to display the entire range of the predetermined area, which is set in advance based on the size of the X-ray detection unit in real space, as the magnified partial image.

[0090] (Item 7) The X-ray imaging device according to Item 6, wherein the control unit is configured to cause the display unit to display, as the enlarged partial image, the entire range of the predetermined area that is set in advance based on the size of the X-ray detection unit in real space for at least one of each imaging region and each surgical procedure.

[0091] (Item 8) An X-ray imaging device according to any one of items 1 to 7, wherein the display unit includes an operation unit that accepts an input operation for fine-tuning the magnification ratio of the enlarged partial image, and the control unit is configured to generate a re-enlarged partial image by further enlarging the enlarged partial image displayed on the display unit, or a reduced enlarged partial image by reducing the enlarged partial image displayed on the display unit, based on the input operation on the operation unit, and display the re-enlarged partial image on the display unit.

[0092] (Item 9) The X-ray imaging device according to any one of Items 1 to 8, wherein the control unit is configured to set the center position of the enlarged partial image to a position that substantially coincides with the position of the intersection based on the relationship between the optical axis of the optical imaging unit and the irradiation axis of the X-rays.

[0093] REFERENCE SIGNS LIST 1 Object 2 Optical image 2a Center position of optical image 3 Enlarged partial image 3a Center position of enlarged partial image 4 Intersection point in real space between X-ray detection unit and irradiation axis of X-rays irradiated from X-ray irradiation unit 5 Optical axis 6 X-ray irradiation axis 7 Predetermined area 10 X-ray irradiation unit 11 X-ray tube 20 X-ray detection unit 30 Optical imaging unit 32 Optical imaging control unit (control unit) 41 Display operation unit (display unit, operation unit) 46 Fine adjustment enlargement operation unit (operation unit) 47 Fine adjustment reduction operation unit (operation unit) 70 Re-enlarged partial image 71 Enlarged partial reduced image 100 X-ray imaging device L1 Distance between optical imaging unit and X-ray detection unit D1 Distance between X-ray irradiation axis and optical axis of optical imaging unit θ Angle of view of optical imaging unit

Claims

1. An X-ray imaging device comprising: an X-ray irradiation unit including an X-ray tube; an X-ray detection unit which detects X-rays irradiated from said X-ray irradiation unit and transmitted through a subject; an optical imaging unit which has an optical axis shifted with respect to the irradiation axis of the X-rays irradiated from said X-ray irradiation unit and captures an optical image of said subject; a control unit which generates an enlarged partial image by cutting out and enlarging a specified area from said optical image; and a display unit which displays the enlarged partial image generated by said control unit, wherein said control unit is configured to shift the center position of said enlarged partial image from the center position of the optical image in a direction approaching the position of the intersection in real space between said X-ray detection unit and the irradiation axis of the X-rays irradiated from the X-ray irradiation unit, based on the relationship between the optical axis of said optical imaging unit and the irradiation axis of the X-rays.

2. The X-ray imaging device of claim 1, wherein the control unit is configured to shift the center position of the enlarged partial image in a direction approaching the intersection position based on the distance between the optical imaging unit and the X-ray detection unit, the distance between the X-ray irradiation axis and the optical axis of the optical imaging unit, and the angle of view of the optical imaging unit.

3. The X-ray imaging device according to claim 1, wherein the optical imaging section is configured to have an optical axis that is approximately parallel to an axis of irradiation of the X-rays emitted from the X-ray irradiation section.

4. The X-ray imaging device according to claim 1, wherein the control unit is configured to cause the display unit to display the range of the specified region in the optical image as the enlarged partial image based on a preset magnification ratio.

5. The X-ray imaging device of claim 4, wherein the control unit is configured to cause the display unit to display the range of the specified region in the optical image as the enlarged partial image based on the magnification ratio that is preset based on at least one of the following: each imaging area, each surgical procedure, and each distance between the X-ray irradiation unit and the X-ray detection unit.

6. The X-ray imaging device of claim 1, wherein the control unit is configured to adjust the magnification ratio for generating the enlarged partial image, so as to cause the display unit to display the entire range of the specified area, which is preset based on the size of the X-ray detection unit in real space, as the enlarged partial image.

7. The X-ray imaging device according to claim 6, wherein the control unit is configured to cause the display unit to display as the enlarged partial image the entire range of the specified area, which is preset based on the size of the X-ray detection unit in real space, for at least one of each imaging region and each surgical procedure.

8. The X-ray imaging device of claim 1, wherein the display unit includes an operation unit that accepts an input operation for fine-tuning the magnification ratio of the enlarged partial image, and the control unit is configured to generate a re-enlarged partial image by further enlarging the enlarged partial image displayed on the display unit, or a reduced enlarged partial image by reducing the enlarged partial image displayed on the display unit, based on the input operation to the operation unit, and display the re-enlarged partial image on the display unit.

9. The X-ray imaging device of claim 1, wherein the control unit is configured to set the center position of the enlarged partial image to a position that approximately coincides with the position of the intersection based on the relationship between the optical axis of the optical imaging unit and the X-ray irradiation axis.

Images