JP2016119939A - X-ray imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray imaging apparatus capable of displaying an image showing a range of an X-ray irradiation field on a display part, even when a collimator lamp is not used, while having a simple constitution.SOLUTION: An irradiation field operation part 14 in a console section 1 operates the size of an X-ray irradiation field to an imaging region by a camera 49. Then, an irradiation field display part 15 in the console section 1 displays an image showing a range of the X-ray irradiation field to a display part of an operation part 41 in an imaging part 4 and to a display part 11 in the console section 1, in the superimposed state on an image of a subject displayed on the display part 11.SELECTED DRAWING: Figure 3

Description

  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 an X-ray irradiation field that is a 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 a distance between the focal point 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. 6-217773

  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, the 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 embodiment 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 problems, and has a simple configuration, but can display an image representing an X-ray irradiation field on a display unit even when a collimator lamp is not used. An object is to provide a radiographic apparatus.

  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; An X-ray imaging apparatus comprising: an opening detector that detects an opening of the collimator leaf; an optical sensor; and a lens system that focuses an image on the optical sensor, together with the X-ray tube and the collimator A moving camera; a display unit for displaying an image of the subject photographed by the camera; an arrangement of the optical sensor and the lens system in the camera; and an arrangement of the X-ray tube and the collimator leaf. Detected by the opening detector Based on the opening of the remeter leaf, an irradiation field calculation unit that calculates the range of the X-ray irradiation field in the image of the subject displayed on the display unit, and the X-ray irradiation calculated by the irradiation field calculation unit An irradiation field display unit configured to display an image representing a field range on the display unit.

According to a second aspect of the present invention, in the first aspect of the present invention, the distance between the lens system of the camera and the subject, and the distance between the focal point of the X-ray tube and the subject are substantially equal. The imaging range of the optical sensor is P, the distance between the optical sensor and the lens system is Q, the imaging range of the subject by the camera is S, the focal point of the X-ray tube and the collimator When the distance from the leaf is T and the opening degree of the collimator leaf is U, the irradiation field calculation unit calculates the X-ray irradiation field R by the following equation.
R = (S × U × Q) / (T × P)

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the irradiation field display unit displays an image representing the range of the X-ray irradiation field on the display unit. To be displayed superimposed on the person's image.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the collimator leaf moving mechanism including a motor for moving the collimator leaf in the collimator, the display unit, And a console unit provided in an operation room provided separately from an imaging room in which X-ray imaging is performed, and an operation unit for operating the collimator leaf moving mechanism.

  According to the first and second aspects of the invention, it is possible to display an image representing the range of the X-ray irradiation field on the display unit even when the collimator lamp is not used even though the configuration is simple. Become. At this time, the range of the X-ray irradiation field is calculated based on the arrangement of the optical sensor and the lens in the camera, the arrangement of the X-ray tube and the collimator leaf, and the opening of the collimator leaf. An image representing the range of the X-ray irradiation field can be displayed on the display unit without measuring the distance between the focal point and the surface of the subject.

  According to the third aspect of the present invention, since the image representing the range of the X-ray irradiation field is displayed so as to be superimposed on the image of the subject displayed on the display unit, the X-ray irradiation field is displayed in the surrounding information. It becomes possible to recognize together.

  According to the fourth aspect of the present invention, 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. It is a perspective view of the examination table 3 and the imaging | photography part 4 in the X-ray imaging apparatus which concerns on this 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. It is explanatory drawing which shows the arrangement | positioning relationship of the apparatus containing the focus 10 of the X-ray tube 42, and the collimator leaf 40 of the collimator 43. FIG. It is explanatory drawing which shows the arrangement | positioning relationship of the apparatus containing the lens system 52 of the camera 49, and the optical sensor 51. FIG. It is explanatory drawing which shows the arrangement | positioning relationship of the apparatus containing the camera 49 and the collimator leaf 40 of the collimator 43. FIG. 4 is a schematic diagram showing an image of a subject 20 displayed on the display units 11 and 46. FIG. It is a schematic diagram which shows other embodiment of the image of the subject 20 displayed on the display parts 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 a camera 49 described later. The console unit 1 is controlled by the control unit 13 shown in FIG. The control unit 13 includes an irradiation field calculation unit 14 and an irradiation field display unit 15 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 on 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 imaging unit 4 includes a base 61 that can move in the A direction and the B direction orthogonal to the ceiling of the imaging room 100, a support 62 that extends downward from the base 61, and the support 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.

  Although not shown in FIGS. 1 and 2, the photographing unit 4 is provided with a camera 49 for photographing an image of the subject 20. The camera 49 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 camera 49 includes a distance between the lens system 52 and the subject 20 in the camera 49, a collimator leaf 40 (see FIGS. 5 and 7 described later) and the subject 20 in the collimator 43. The X-ray tube 42 or the collimator 43 is attached at a position where the distance is substantially the same.

  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 camera 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. Note that the display unit 46 also displays an image of the subject 20 taken by the camera 49.

  FIG. 7 is an explanatory diagram showing an arrangement relationship of apparatuses including the focal point 10 of the X-ray tube 42 and the collimator leaf 40 of the collimator 43.

  As shown in this figure, the SOD that is the distance between the focal point 10 of the X-ray tube 42 and the surface of the subject 20 (X-ray irradiation field R) is L, and the focal point 10 of the X-ray tube 42 and the collimator 43 When the distance from the collimator leaf 40 is T and the distance between the collimator leaves 40 (opening degree of the collimator leaf 40) is U, the length of one side of the X-ray irradiation field R is the size indicated by the arrow R in FIG. It becomes.

  FIG. 8 is an explanatory diagram showing an arrangement relationship of devices including the lens system 52 of the camera 49 and the optical sensor 51.

  The camera 49 described above includes an optical sensor 51 formed of an image pickup device such as a CCD or CMOS, and a lens system 52 that focuses an image on the optical sensor 51. In this figure, the lens system 52 is expressed as a single lens, but the lens system 52 may be composed of a plurality of lenses. As shown in this figure, the distance (focal length) between the lens system 52 and the optical sensor 51 is Q. At this time, the imaging region by the camera 49 is S, and the distance between the lens system 52 and the surface of the subject 20 is M. As shown in this figure, the values of [P / Q] and [S / M] are equal to each other, and these values are published as specifications of various cameras by the camera manufacturer as the angle of view.

  FIG. 9 is an explanatory diagram showing an arrangement relationship of apparatuses including the camera 49 and the collimator leaf 40 of the collimator 43.

  As shown in this figure, the distance M between the lens system 52 of the camera 49 and the subject 20 and the distance L between the focal point 10 of the X-ray tube 42 and the subject 20 are substantially the same. A camera 49 is arranged. That is, the distance L shown in FIG. 7 and the distance M shown in FIG. 8 are substantially the same. The camera 49 is not disposed inside the X-ray tube 42 but is attached to the imaging unit 4 provided with the X-ray tube 42. For this reason, it is impossible to make the distance between the lens system 52 of the camera 49 and the subject 20 and the distance between the focal point 10 of the X-ray tube 42 and the subject 20 completely the same. An error occurs. However, if the distance M between the lens system 52 of the camera 49 and the subject 20 or the distance L between the focal point 10 of the X-ray tube 42 and the subject 20 is sufficiently large with respect to this error, this error Is negligible.

In such an arrangement relationship, as shown in FIG. 7, U / T = R / L and L = T × R / U. On the other hand, as shown in FIG. 8, P / Q = S / M, and M = Q × S / P. When L = M, the following equation (1) is established.
R = (S × U × Q) / (T × P) (1)

  Next, in the X-ray imaging apparatus having the above-described configuration, the range of the X-ray irradiation field R 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. A characteristic operation of the present invention for displaying an image indicating the above will be described.

  When adjusting the X-ray irradiation field R in order to perform X-ray imaging or X-ray fluoroscopy with this X-ray imaging apparatus, first, the subject 20 is placed in the imaging room 100 and is placed on the top 31 of the examination table 3. Placed on. Then, the subject 20 is photographed using the camera 49 of the photographing unit 4. The image of the subject 20 captured by the camera 49 is displayed on the display unit 46 of the operation unit 41 in the imaging unit 4 and the display unit 11 in the console unit 1.

  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 camera 49 with respect to the subject 20. In this state, the X-ray irradiation field R is set. At this time, the operator may move to the operation room 101 and operate the operation unit 12 to move the collimator leaf 40 by driving the motor 58 shown in FIG. 3 to adjust the X-ray irradiation field. . 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, the irradiation field calculation unit 14 in the console unit 1 calculates the size of the X-ray irradiation field R with respect to the imaging region S by the camera 49 based on the above-described equation (1). The irradiation field display unit 15 in the console unit 1 displays an image representing the range of the X-ray irradiation field R on the display unit 46 of the operation unit 41 in the imaging unit 4 and the display unit 11 in the console unit 1. The images of the subject 20 displayed on the parts 11 and 46 are superimposed on the image.

  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 the operator moves to the operation room 101, the operator confirms the display unit 11 in the console unit 1 to confirm whether or not the subject 20 has moved, and the X-ray irradiation field R is appropriate. You can check if there is. 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 fluoroscopy.

  FIG. 11 is a schematic diagram illustrating another embodiment of the image of the subject 20 displayed on the display units 11 and 46.

  In the embodiment shown in FIG. 10, as an image representing the X-ray irradiation field R, an image representing the range of the X-ray irradiation field R is displayed as a rectangular line drawing superimposed on the image of the subject 20. Yes. In contrast, in the embodiment shown in FIG. 11, only the image in the X-ray irradiation field R of the subject 20 is displayed on the display units 11 and 46.

  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. Further, 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 unit for displaying an image of the subject 20 and an image representing the range of the X-ray irradiation field R May be attached.

DESCRIPTION OF SYMBOLS 1 Console part 2 High voltage apparatus 3 Examination table 4 Imaging part 10 Focus 11 Display part 12 Operation part 20 Subject 21 Operation panel 22 Display part 23 Switch 25 Control part 31 Top plate 33 X-ray detection part 34 Elevation part 35 Control part DESCRIPTION OF SYMBOLS 40 Collimator leaf 41 Operation part 42 X-ray tube 43 Collimator 44 Operation panel 45 Handle 46 Display part 48 Control part 49 Camera 51 Optical sensor 52 Lens system 58 Motor 59 Opening detector 100 Photographing room 101 Operation room 103 Hospital network

Claims (4)

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 camera that includes an optical sensor and a lens system that collects an image on the optical sensor, and moves together with the X-ray tube and the collimator;
A display unit for displaying an image of the subject photographed by the camera;
Based on the arrangement of the optical sensor and the lens system in the camera, the arrangement of the X-ray tube and the collimator leaf, and the opening of the collimator leaf detected by the opening detector, the display unit An irradiation field calculation unit for calculating a range of an X-ray irradiation field in the displayed image of the subject;
An irradiation field display unit for displaying an image representing the range of the X-ray irradiation field calculated by the irradiation field calculation unit on the display unit;
An X-ray imaging apparatus comprising: The X-ray imaging apparatus according to claim 1,
The distance between the lens system of the camera and the subject, and the distance between the focal point of the X-ray tube and the subject are substantially the same,
The imaging range of the optical sensor is P, the distance between the optical sensor and the lens system is Q, the imaging range of the subject by the camera is S, and the distance between the focal point of the X-ray tube and the collimator leaf is T. When the opening degree of the collimator leaf is U, the irradiation field calculation unit calculates the X-ray irradiation field R by the following formula.
R = (S × U × Q) / (T × P) The X-ray imaging apparatus according to claim 1 or 2,
The said irradiation field display part is an X-ray imaging apparatus which displays the image showing the range of the said X-ray irradiation field superimposed on the image of the subject displayed on the said display part. The X-ray imaging apparatus according to any one of claims 1 to 3,
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:

Images