WO2016103361A1

WO2016103361A1 - X-ray imaging apparatus

Info

Publication number: WO2016103361A1
Application number: PCT/JP2014/084119
Authority: WO
Inventors: 皓史奥村
Original assignee: 株式会社島津製作所
Priority date: 2014-12-24
Filing date: 2014-12-24
Publication date: 2016-06-30

Abstract

A distance calculation section 16 of a console unit 1 calculates the distance between a focal point of an X-ray tube 42 and a subject on the basis of an image of the subject captured by a stereo camera 50. Subsequently, a radiation field calculation section 14 of the console unit 1 calculates the range of an X-ray radiation field R in an image of the subject 20 displayed on a display section on the basis of the opening of collimator leaves 40 detected by an opening detector 59 of the collimator 43 and the distance between the focal point of the X-ray tube 42 and the subject calculated by the distance calculation section 16. Thereafter, a radiation field display section 15 of the console unit 1 superimposes an image showing the range of the X-ray radiation field R calculated by the radiation field calculation section 14 on the image of the subject displayed on the display section.

Description

X-ray equipment

The present invention relates to an X-ray tube that irradiates an X-ray toward a subject, an X-ray detector that detects X-rays that have been irradiated from the X-ray tube and passed through the subject, an X-ray tube, and the subject The present invention relates to an X-ray imaging apparatus including a plurality of collimator leaves disposed between and a collimator that forms an X-ray irradiation field irradiated from a X-ray tube toward a subject.

In such an X-ray imaging apparatus, it is necessary to adjust the position of the collimator leaf in order to set the X-ray irradiation field that is the range of X-rays irradiated from the X-ray tube toward the subject. In such a case, if the position of the collimator leaf is adjusted by actually irradiating X-rays from the X-ray tube, the exposure dose to the subject increases. Therefore, in such an X-ray imaging apparatus, when adjusting the X-ray irradiation field irradiated from the X-ray tube toward the subject by moving the collimator leaf, the collimator mechanism is opposite to the patient. A visible light irradiation field is formed by turning on the collimator lamp disposed in the X-ray beam, and the X-ray irradiation field formed by the collimator mechanism is confirmed by visually recognizing the visible light irradiation field.

Although the X-ray irradiation field adjustment mechanism using such a collimator lamp can adjust the X-ray irradiation field without increasing the exposure dose of the X-rays to the subject, In addition to the problem that the lamp needs to be replaced at regular intervals, it is difficult to set the X-ray field accurately because the range of the visible light field is unclear, In addition, there is a problem that the adjustment takes time.

In Patent Document 1, a mirror is arranged inside the collimator, a camera is arranged at a position conjugate with the focal point of the X-ray tube inside the collimator, and the optical axis of the camera and X-rays from the X-ray tube are arranged. An X-ray imaging apparatus in which the irradiation axis is matched is disclosed. In the X-ray imaging apparatus described in Patent Document 1, an X-ray irradiation field is imaged by a camera to acquire video data, and this is displayed on a display unit, so that X-rays can be used without using a collimator lamp. It has a configuration in which the irradiation field can be confirmed. In the X-ray imaging apparatus described in Patent Document 1, an SOD (Source Object Distance) that is the distance between the focus of the X-ray tube and the surface of the subject is measured by using an autofocus mechanism. Like to do.

Japanese Patent Laid-Open No. 6-217973

In such an X-ray imaging apparatus, the X-ray imaging unit is disposed in the imaging room, and the X-ray irradiation field adjustment (size change and position change) is performed in the imaging room. An imaging operation for line imaging is executed in an operation room provided separately from the imaging room. For this reason, when the adjustment mechanism of the X-ray irradiation field using the collimator lamp described above is used, the subject is adjusted while the operator moves from the imaging room to the operation room after adjusting the X-ray irradiation field. May move. In such a case, appropriate X-ray imaging cannot be performed, and the exposure dose to the subject increases due to re-imaging.

In some cases, adjustment of the X-ray irradiation field is performed in an operation room provided separately from the imaging room. In this case, opening and closing of the collimator leaf for adjusting the irradiation field of visible light or movement of the collimator is performed using an operation unit installed in the operation chamber. Also at this time, when the above-described X-ray irradiation field adjustment mechanism using the collimator lamp is used, the operator can contact the subject through a lead glass window provided between the operation room and the imaging room. The range of the visible light irradiated is confirmed visually, and the collimator leaf opening / closing operation or collimator moving operation is executed. However, the size of the lead glass window may not be so large, and it cannot be said that the work of confirming the irradiation field of the visible light through the lead glass window has good visibility. For this reason, adjustment of the irradiation field of visible light has poor work efficiency, and the irradiation field of visible light may not be adjusted accurately. Even in such a case, appropriate X-ray imaging cannot be performed, and the exposure dose to the subject increases due to re-imaging.

As described in Patent Document 1, a camera is arranged at a position conjugate with the focal point of the X-ray tube inside the collimator, and video data acquired by the camera is displayed on a display unit arranged in the operation room. It is also conceivable to try to solve the above-mentioned problem. In that case, as described in Patent Document 1, only the X-ray irradiation field can be confirmed by the image acquired by the camera. However, when the imaging region is determined, not only the X-ray irradiation field but also the surrounding information is required. For example, when narrowing the X-ray field, that is, when reducing the size of the X-ray field, if the image acquired by the camera is only the subject's clothes or skin, the size of the X-ray field Cannot determine whether is appropriate. Similarly, when moving in a state where the X-ray irradiation field is narrowed, the image of the X-ray irradiation field alone is insufficient, and the X-ray irradiation field cannot be moved appropriately. That is, even when the X-ray imaging apparatus described in Patent Document 1 is used, it is difficult to appropriately adjust the X-ray irradiation field (size change and position change).

In addition, in the sixth example shown in FIG. 17 of Patent Document 1, an image of the subject photographed in advance and a diaphragm frame corresponding to the opening of the collimator leaf detected by the diaphragm opening detection unit, A configuration in which the images are combined and displayed on a display unit is disclosed. Although the configuration described in the sixth example of Patent Document 1 can also display an image outside the X-ray irradiation field in the subject, the image of the subject is not a real-time image. Therefore, it cannot be determined whether or not the X-ray irradiation field is correctly installed based on this image.

Further, as described in Patent Document 1, a camera is disposed at a position conjugate with the focal point of the X-ray tube inside the collimator, and the optical axis of this camera and the irradiation axis of X-rays from the X-ray tube are set. When the matching configuration is adopted, not only the collimator is increased in size but also the axis alignment becomes complicated. For this reason, the structure of an X-ray irradiation part becomes complicated and the problem that manufacturing cost becomes expensive arises.

Furthermore, in the X-ray imaging apparatus described in Patent Document 1, a value such as SOD that is the distance between the focal point of the X-ray tube and the surface of the subject is calculated using the value measured by the autofocus unit, Based on the calculation result, the size of the X-ray irradiation field displayed on the monitor is calculated. However, when the acquired image is only a relatively uniform subject's clothes or skin, the auto focus alone has a value such as SOD that is the distance between the focal point of the X-ray tube and the surface of the subject. There arises a problem that the operation cannot be executed accurately.

The present invention has been made in order to solve the above-described problems, and has a simple configuration, and even when the collimator lamp is not used, an image representing the range of the X-ray irradiation field is displayed on the display unit. An object of the present invention is to provide an X-ray imaging apparatus that can be displayed superimposed on an image of a person.

The invention according to claim 1 is an X-ray tube that irradiates an X-ray toward a subject, an X-ray detection unit that detects X-rays irradiated from the X-ray tube and passed through the subject, A collimator comprising a plurality of collimator leaves disposed between the X-ray tube and the subject, and forming an X-ray irradiation field irradiated from the X-ray tube toward the subject; The X-ray imaging apparatus includes an opening detector that detects an opening of the collimator leaf, and a pair of imaging units that move together with the X-ray tube and the collimator. A stereo camera to be photographed, a display unit for displaying an image of the subject photographed by the stereo camera, and the X-ray tube and the subject based on the image of the subject photographed by the stereo camera A distance calculation unit for calculating the distance between and The subject displayed on the display unit based on the opening of the collimator leaf detected by the opening detector and the distance between the X-ray tube and the subject calculated by the distance calculator. An irradiation field calculation unit that calculates the range of the X-ray irradiation field in the person's image, and an image representing the range of the X-ray irradiation field calculated by the irradiation field calculation unit of the subject displayed on the display unit An irradiation field display unit that displays the image in a superimposed manner.

According to a second aspect of the present invention, in the first aspect of the present invention, the collimator leaf moving mechanism including a motor for moving the collimator leaf in the collimator, the display unit, and the collimator leaf moving mechanism are provided. And a console unit provided in an operation room provided separately from an imaging room in which X-ray imaging is performed.

According to the first aspect of the present invention, the range of the X-ray irradiation field is expressed by using the distance between the X-ray tube and the subject calculated based on the image of the subject taken by the stereo camera. Since the image is displayed superimposed on the image of the subject displayed on the display unit, the X-ray irradiation field can be recognized together with the surrounding information. For this reason, even when the collimator lamp is not used, the range of the X-ray irradiation field can be easily recognized with a simple configuration.

According to the invention described in claim 2, even when the opening of the collimator leaf is operated in the operation room, the X-ray irradiation field can be confirmed together with the image of the subject in the operation room.

1 is a schematic diagram of an X-ray imaging apparatus according to the present invention. 1 is a perspective view of an examination table 3 and an imaging unit 4 in an X-ray imaging apparatus according to the present invention. It is a block diagram which shows the main control systems of the X-ray imaging apparatus which concerns on this invention. 1 is a schematic diagram of a high voltage device 2. FIG. 4 is a perspective view schematically showing a collimator leaf 40 in a collimator 43. FIG. 3 is a front view of an operation unit 41. FIG. 6 is an explanatory diagram showing a method of calculating a distance Z between the focal points f1 and f2 of the pair of imaging units 49 in the stereo camera 50 and the body surface P of the subject 20. FIG. It is explanatory drawing which shows the calculation method which calculates the range of the X-ray irradiation field in the image of the subject. 6 is an explanatory diagram illustrating a relationship between an imaging range by an imaging unit 49 and an imaging surface of the imaging unit 49. FIG. 4 is a schematic diagram showing an image of a subject 20 displayed on the

display units

11 and 46. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an X-ray imaging apparatus according to the present invention. FIG. 2 is a perspective view of the examination table 3 and the imaging unit 4 in the X-ray imaging apparatus according to the present invention. FIG. 3 is a block diagram showing a main control system of the X-ray imaging apparatus according to the present invention.

An X-ray imaging apparatus according to the present invention is used for imaging a console unit 1 and a high-voltage apparatus 2 installed in an operation room 101 for an operator to perform an X-ray imaging operation, and a subject 20. An examination table 3 and an imaging unit 4 installed in the imaging room 100 are provided. The imaging room 100 and the operation room 101 are blocked by a partition wall 102.

The console unit 1 installed in the operation room 101 includes a display unit 11 composed of a liquid crystal display and the like, and an operation unit 12 composed of a keyboard, a mouse and the like for executing various operations. The display unit 11 displays an X-ray image and an image of the subject 20 captured by the imaging unit 49 in the stereo camera 50 described later. The console unit 1 is controlled by the control unit 13 shown in FIG. The control unit 13 includes a distance calculation unit 16, an irradiation field calculation unit 14, and an irradiation field display unit 15 which will be described later. Further, as shown in FIG. 3, the console unit 1 is connected to an in-hospital network 103 which is in-hospital communication of a subject management system in a hospital.

FIG. 4 is a schematic diagram of the high-voltage device 2.

The high voltage device 2 is disposed in the partition wall 102 in the operation chamber 101. As shown in FIGS. 3 and 4, the high voltage apparatus 2 is configured to irradiate an X-ray from an operation panel 21 having a display unit 22 constituted by a touch panel type liquid crystal display, an input button 24, and an X-ray tube 42. And a switch 23 for starting the operation. This high voltage apparatus 2 is for setting X-ray irradiation conditions such as the tube voltage and tube current of the X-ray tube 42 or the X-ray irradiation time. The high voltage device 2 is controlled by the control unit 25 shown in FIG.

Referring to FIGS. 1 to 3 again, the examination table 3 includes a top plate 31 on which the subject 20 is placed and a flat panel detector (FPD) 38 as an X-ray detector inside (see FIG. 3). And an elevating unit 34 for elevating the top plate 31 and the X-ray detecting unit 33. The X-ray detection unit 33 can move horizontally in the G direction shown in FIG. In addition, the X-ray detection unit 33 can be moved up and down in the F direction shown in FIG. The examination table 3 is controlled by the control unit 39 shown in FIG.

In this embodiment, the table-type examination table 3 for photographing the subject 20 on the top board 31 in the prone state is adopted, and the X-ray detection unit 33 is horizontally arranged in the G direction shown in FIG. It is configured to move. On the other hand, when a stand-type imaging table that images the subject 20 in a standing position is used, the X-ray detection unit 33 moves up and down.

As shown in FIG. 2, the photographing unit 4 includes a base 61 that is movable in the A direction and the B direction perpendicular to the ceiling of the photographing room 100, a support 62 that extends downward from the base 61, The moving part 63 that moves up and down in the C direction with respect to the part 62 and pivots in the D direction and is pivotally supported by the lower end part of the moving part 63, and the operation part 41, the X-ray tube 42, and the collimator 43 are integrated into E And a support shaft 64 that rotates in the direction. For this reason, the operation unit 41, the X-ray tube 42, and the collimator 43 are movable in the A, B, C, D, and E directions. The photographing unit 4 is controlled by the control unit 48 shown in FIG.

As shown in FIGS. 1 and 3, the photographing unit 4 is provided with a stereo camera 50 having a pair of photographing units 49 for photographing an image of the subject 20. The stereo camera 50 moves together with the X-ray tube 42 and the collimator 43 and takes an image of the subject 20. As will be described later, the stereo camera 50 is used to calculate the SOD that is the distance between the focal point of the X-ray tube 42 and the surface of the subject 20.

FIG. 5 is a perspective view schematically showing the collimator leaf 40 in the collimator 43 described above.

The collimator 43 described above includes four collimator leaves 40. Part of the X-rays irradiated from the focal point 10 of the X-ray tube 42 is blocked by these four collimator leaves 40, thereby forming a rectangular X-ray irradiation field R. These collimator leaves 40 move horizontally by driving a motor 58 shown in FIG. The opening degree of the collimator leaf 40 is detected by an opening degree detector 59 shown in FIG. As the opening detector 59, an encoder, a potentiometer or the like is used. However, when a stepping motor or the like is used, the driving unit of the motor 58 may be used as the opening detector 59, and the opening of the collimator leaf 40 may be detected by a driving signal to the motor 58.

FIG. 6 is a front view of the operation unit 41 in the photographing unit 4.

The operation unit 41 includes a handle 45 for moving the X-ray tube 42 together with the collimator 43 and the imaging unit 49, and an operation panel 44. A display unit 46 composed of a touch panel type liquid crystal display is disposed at the center of the operation panel 44. A plurality of buttons 53 are disposed around the display unit 46. The display unit 46 also displays an image of the subject 20 captured by the imaging unit 49 of the stereo camera 50.

In the X-ray imaging apparatus having the above configuration, the range of the X-ray irradiation field R is shown together with the image of the subject 20 displayed on the display unit 11 of the console unit 1 and the display unit 46 of the operation unit 41. An image is displayed. At this time, the distance calculation unit 16 in the console unit 1 shown in FIG. 3 calculates the distance between the focal point of the X-ray tube 42 and the subject 20 based on the image of the subject 20 taken by the stereo camera 50. The Next, the opening of the collimator leaf 40 detected by the opening detector 59 in the collimator 43 by the irradiation field calculator 14 in the console unit 1, the focal point of the X-ray tube 42 calculated by the distance calculator 16, and the subject The range of the X-ray irradiation field R in the image of the subject 20 displayed on the

display units

11 and 46 is calculated on the basis of the distance to 20. Thereafter, an image representing the range of the X-ray irradiation field R calculated by the irradiation field calculation unit 14 is displayed on the

display units

11 and 46 by the irradiation field display unit 15 in the console unit 1. Overlaid and displayed.

Next, a calculation method for calculating the distance between the focal point of the X-ray tube 42 and the subject 20 based on the image of the subject 20 taken by the stereo camera 50 by the distance calculation unit 16 in the console unit 1 will be described. To do. The distance between the focal point of the X-ray tube 42 and the subject 20 is calculated based on the image of the subject 20 photographed by the stereo camera 50 and the focal point of the photographing unit 49 in the stereo camera 50 and the subject 20. Is calculated by the distance calculator 16 as the sum of the distance between the focal point of the photographing unit 49 and the focal point of the X-ray tube 42 in the stereo camera 50 set in advance.

FIG. 7 is an explanatory diagram illustrating a method of calculating the distance Z between the focal points f1 and f2 of the pair of imaging units 49 in the stereo camera 50 and the body surface P of the subject 20. In this figure, the imaging unit 49 shows the imaging surface.

In this figure, the focal points of the pair of photographing units 49 in the stereo camera 50 are f1, f2, the distance between the focal points f1, f2 is B, and the focal length of the pair of photographing units 49 is F. Further, the parallax of the pair of photographing units 49 constituting the stereo camera 50 is D. The parallax D is obtained by specifying a predetermined feature point in an image photographed by one of the pair of photographing units 49 and an image photographed by the other photographing unit 49 by pattern matching or the like, and calculating a distance between them. Is required. At this time, the distance Z between the focal points f1 and f2 of the pair of imaging units 49 in the stereo camera 50 and the body surface P of the subject 20 is calculated by the following equation (1).
Z = B × F / D (1)

Then, by the distance calculation unit 16, the distance Z between the focal points f1 and f2 of the pair of photographing units 49 in the stereo camera 50 and the body surface P of the subject 20 and the focal point f1 of the photographing unit 49 in the stereo camera 50 described later. , F2 and the distance g (see FIG. 8) between the focal point 10 of the X-ray tube 42 and the SOD that is the distance between the focal point of the X-ray tube 42 and the body surface P of the subject 20 is calculated. The As described above, since the SOD is calculated using the stereo camera 50 having the pair of photographing units 49, the SOD can be calculated quickly and accurately.

Next, a calculation method for calculating the range of the X-ray irradiation field R in the image of the subject 20 displayed on the

display units

11 and 46 by the irradiation field calculation unit 14 in the console unit 1 will be described. FIG. 8 is an explanatory diagram showing a calculation method for calculating the range of the X-ray irradiation field R in the image of the subject 20. In this embodiment, the case where the image of the subject 20 displayed on the

display units

11 and 46 is captured by one of the pair of imaging units 49 in the stereo camera 50 is shown. .

FIG. 8 shows a state in which X-rays irradiated from the focal point 10 of the X-ray tube 42 are irradiated to the subject 20 after forming the X-ray irradiation field R by the collimator leaf 40 in the collimator 43. . The opening degree a of the collimator leaf 40 at this time is detected by the opening degree detector 59 shown in FIG. 3 as described above. Further, the distance b between the focal point 10 of the X-ray tube 42 and the collimator leaf 40 at this time is a known value unique to the apparatus. The SOD, which is the distance between the focal point of the X-ray tube 42 and the body surface P of the subject 20, is the distance Z between the focal point of the imaging unit 49 in the stereo camera 50 and the subject 20, as described above. The distance calculation unit 16 calculates the sum of the distance g between the focal point of the photographing unit 49 and the focal point 10 of the X-ray tube 42 in the preset stereo camera 50.

In FIG. 8, the symbol c indicates the range of the X-ray irradiation field R, the symbol d indicates the imaging range by the imaging unit 49, and the symbol e indicates the offset between the center of the X-ray irradiation field R and the optical axis of the imaging unit 49. , Θ represents the angle of view of the photographing unit 49. The offset e and the angle of view θ are known values specific to the apparatus.

Under such conditions, the range c of the X-ray irradiation field R is obtained by the following equation (2), and the imaging range d by the imaging unit 49 is obtained by the following equation (3).
c = a × SOD / b (2)
d = 2 × Z × tan (θ / 2) (3)

The irradiation field calculation unit 14 in the console unit 1 uses the above equations (2) and (3) to determine the range of the X-ray irradiation field R in the image of the subject 20 displayed on the

display units

11 and 46. Calculate. And the irradiation field display part 15 in the console part 1 superimposes the image showing the range of the X-ray irradiation field R with the image of the subject 20 displayed on the

display parts

11 and 46 based on the calculation result. To display.

FIG. 9 is an explanatory diagram showing the relationship between the imaging range of the imaging unit 49 and the imaging surface of the imaging unit 49. In FIG. 9, the photographing unit 49 illustrates the imaging surface.

As described above, when the focal length of the imaging unit 49 is F and the distance between the focal point f of the imaging unit 49 and the subject 20 is Z, the range c of the X-ray irradiation field R described above and the imaging unit 49 The magnitudes of the offset e between the imaging range d and the center of the X-ray irradiation field R and the optical axis of the imaging unit 49 are each [F / Z] times on the imaging surface of the imaging unit 49. Therefore, on the imaging surface of the imaging unit 49, an image representing the range of the X-ray irradiation field R by an element corresponding to a region of c × [F / Z] centered on e × [F / Z] from the center. It should be displayed.

When the X-ray irradiation field R is adjusted in order to perform X-ray imaging or X-ray fluoroscopy with the X-ray imaging apparatus having the above-described configuration, first, the subject 20 is placed in the imaging room 100 and the examination table is placed. 3 on the top plate 31. Then, the subject 20 is photographed using the pair of photographing units 49 in the stereo camera 50 of the photographing unit 4. The image of the subject 20 photographed by any one of the pair of photographing units 49 is displayed on the display unit 46 of the operation unit 41 in the photographing unit 4 and the display unit 11 in the console unit 1. Is done.

Next, the position of the X-ray irradiation field R is adjusted by operating the operation unit 41 in the imaging unit 4 and moving the X-ray tube 42 and the collimator 43 together with the imaging unit 49 with respect to the subject 20. In this state, the X-ray irradiation field R is set. At this time, the operator may adjust the X-ray irradiation field R by moving the collimator leaf 40 by driving the motor 58 shown in FIG. . Further, the operator may adjust the X-ray irradiation field R by moving the collimator leaf 40 by operating the operation unit 41 of the imaging unit 4 in the imaging room 100. The opening degree of the collimator leaf 40 at this time is detected by an opening degree detector 59 shown in FIG.

In this state, as described above, the distance between the focal point of the X-ray tube 42 and the subject 20 is determined based on the image of the subject 20 captured by the stereo camera 50 by the distance calculation unit 16 in the console unit 1. Calculated. Further, the irradiation field calculation unit 14 in the console unit 1 detects the opening of the collimator leaf 40 detected by the opening detector 59 in the collimator 43, the focal point of the X-ray tube 42 calculated by the distance calculation unit 16, and the subject 20. And the range of the X-ray irradiation field R in the image of the subject 20 displayed on the

display units

11 and 46 is calculated. Thereafter, an image representing the range of the X-ray irradiation field R calculated by the irradiation field calculation unit 14 is displayed on the

display units

FIG. 10 is a schematic diagram showing an image of the subject 20 displayed on the

display units

11 and 46.

As shown in this figure, in the images displayed on the

display units

11 and 46, an image indicating the range of the X-ray irradiation field R is displayed as a rectangular line drawing superimposed on the image of the subject 20. The For this reason, the operator can recognize the X-ray irradiation field R for the subject 20 together with the surrounding images. As a result, the X-ray irradiation field R can be easily adjusted to the size of the region desired to be diagnosed by X-ray imaging or X-ray fluoroscopy.

Even after moving to the operation room 101, the operator confirms whether the subject 20 has moved by checking the display unit 11 in the console unit 1 and whether the X-ray irradiation field R is appropriate. Can be confirmed. Then, if necessary, the operation unit 12 is operated to adjust the X-ray irradiation field R. Also at this time, since the image representing the range of the X-ray irradiation field R is displayed on the display unit 11 of the console unit 1 so as to be superimposed on the image of the subject 20, the adjustment of the X-ray irradiation field R is adjusted. Can be executed easily.

When the adjustment of the X-ray irradiation field R is completed, the operator operates the switch 23 of the high voltage apparatus 2 in the operation room 101 to execute X-ray imaging or X-ray apparatus.

In the above-described embodiment, the X-ray detector 33 uses the flat panel detector 38 to detect X-rays. However, instead of the flat panel detector 38, an image intensifier (I.I. ) May be used. Further, instead of the X-ray detector, a cassette containing a film may be used.

In the above-described embodiment, the image of the subject 20 and the image representing the X-ray irradiation field R are displayed on both the display unit 11 of the console unit 1 and the display unit 46 of the operation unit 41. However, the image of the subject 20 and the image representing the X-ray irradiation field R may be displayed only on either the display unit 11 of the console unit 1 or the display unit 46 of the operation unit 41. In the case of an X-ray imaging apparatus that does not have a display unit that displays an X-ray image, a dedicated display for displaying an image of the subject 20 and an image representing the range of the X-ray irradiation field R. A part may be provided.

Further, in the above-described embodiment, a configuration in which the stereo camera 50 having the pair of imaging units 49 is attached to the lower surface of the collimator 43 is adopted. However, the stereo camera 50 may be attached to the X-ray tube 42. . Further, if the stereo camera 50, the X-ray tube 42, and the collimator 43 are configured to move, the stereo camera 50 may be attached to other parts.

DESCRIPTION OF SYMBOLS 1 Console part 2 High voltage apparatus 3 Examination table 4 Imaging unit 10 Focus 11 Display part 12 Operation part 13 Control part 14 Irradiation field calculation part 15 Irradiation field display part 16 Distance calculation part 20 Subject 21 Operation panel 22 Display part 23 Switch 25 control unit 31 top plate 33 X-ray detection unit 34 elevating unit 35 control unit 40 collimator leaf 41 operation unit 42 X-ray tube 43 collimator 44 operation panel 45 handle 46 display unit 48 control unit 49 photographing unit 50 stereo camera 58 motor 59 opening Degree detector 100 Shooting room 101 Operation room 103 Hospital network

Claims

An X-ray tube that irradiates the subject with X-rays, an X-ray detector that detects X-rays emitted from the X-ray tube and passed through the subject, the X-ray tube and the subject A plurality of collimator leaves disposed between the collimator and a collimator that forms an X-ray field irradiated from the X-ray tube toward the subject.
An opening detector for detecting the opening of the collimator leaf;
A stereo camera that has a pair of imaging units that move together with the X-ray tube and the collimator, and images the subject simultaneously from different directions;
A display unit for displaying an image of the subject photographed by the stereo camera;
A distance calculation unit that calculates the distance between the X-ray tube and the subject based on the image of the subject photographed by the stereo camera;
Based on the opening of the collimator leaf detected by the opening detector and the distance between the X-ray tube and the subject calculated by the distance calculator, the subject displayed on the display unit An irradiation field calculation unit for calculating the range of the X-ray irradiation field in the person's image;
An irradiation field display unit that displays an image representing the range of the X-ray irradiation field calculated by the irradiation field calculation unit, superimposed on the image of the subject displayed on the display unit;
An X-ray imaging apparatus comprising:
The X-ray imaging apparatus according to claim 1,
A collimator leaf moving mechanism having a motor for moving the collimator leaf in the collimator;
A console unit provided in an operation room provided separately from an imaging room in which X-ray imaging is performed, the display unit and an operation unit for operating the collimator leaf moving mechanism;
An X-ray imaging apparatus further comprising: