阅读说明：本技术 放射线摄像装置 (Radiation imaging apparatus ) 是由 叶真一 于 2020-09-23 设计创作，主要内容包括：本发明提供一种放射线摄像装置,即使在以下管方式进行摄影的情况下,与以往相比,也容易在照射放射线之前掌握照射场的中心位置。放射线摄像装置(10)具备：照射部(18),照射放射线；臂,安装有照射部(18)且能够将接受放射线的图像接受部(20)及照射部(18)安装于夹着被摄体而对置的位置上,并且通过旋转,能够使照射部(18)及图像接受部(20)相对于被摄体(H)的位置关系反转；第1光源(50),设置在照射部(18)中且发出表示放射线的照射场的可见光；及第2光源(60),设置在图像接受部(20)中且发出表示由照射部(18)照射的放射线的照射场的中心位置的可见光。(The invention provides a radiation imaging apparatus, which is easier to grasp the central position of an irradiation field before irradiating radiation compared with the prior art even when the radiation imaging apparatus is used for imaging in a following tube mode. A radiation imaging device (10) is provided with: an irradiation unit (18) that irradiates radiation; an arm to which an irradiation section (18) is attached, which can attach an image receiving section (20) that receives radiation and the irradiation section (18) to positions that face each other with an object therebetween, and which can reverse the positional relationship between the irradiation section (18) and the image receiving section (20) with respect to the object (H) by rotating; a 1 st light source (50) that is provided in the irradiation section (18) and emits visible light representing an irradiation field of radiation; and a 2 nd light source (60) which is provided in the image receiving section (20) and emits visible light indicating the center position of the irradiation field of the radiation irradiated by the irradiation section (18).)

1. A radiation imaging apparatus includes:

an irradiation unit that irradiates radiation;

an arm to which the irradiation section is attached, the arm being capable of attaching the image receiving section and the irradiation section that receive the radiation to positions that face each other with an object interposed therebetween, and being capable of reversing a positional relationship between the irradiation section and the image receiving section with respect to the object by rotating the arm;

a 1 st light source that is provided in the irradiation portion and emits visible light representing an irradiation field of the radiation; and

and a 2 nd light source which is provided in the image receiving section and emits visible light indicating a center position of an irradiation field of the radiation irradiated by the irradiation section.

2. The radiation imaging apparatus according to claim 1,

the irradiation section can continuously irradiate the radiation to perform moving image photographing.

3. The radiation imaging apparatus according to claim 1 or 2,

the 2 nd light source is a laser light source.

4. The radiation imaging apparatus according to claim 1,

the 2 nd light source is a light source that forms a plurality of light beams that linearly irradiate a surface of the object and intersect on the surface as the visible light,

the center position of the irradiation field can be represented by an intersection of the plurality of light beams.

5. The radiation imaging apparatus according to claim 1,

the 1 st light source is an LED light source.

6. The radiation imaging apparatus according to claim 1,

at least one of the 1 st light source and the 2 nd light source is a color-changeable light source capable of changing color.

7. The radiation imaging apparatus according to claim 6,

the color-changing light source has a plurality of light-emitting elements emitting different colors.

8. The radiation imaging apparatus according to claim 6 or 7,

the radiation imaging apparatus includes a color sensor that detects a color of an object,

the radiation imaging apparatus includes a color adjustment unit that adjusts the color of light emitted by the color-changing light source according to the color detected by the color sensor.

9. The radiation imaging apparatus according to claim 1,

the radiation imaging apparatus includes a light amount adjustment unit that adjusts the light amount of at least one of the 1 st light source and the 2 nd light source.

10. The radiation imaging apparatus according to claim 9,

the radiation imaging apparatus includes an illuminance sensor that detects ambient illuminance,

the light amount adjusting unit adjusts the amount of visible light representing the irradiation field according to the illuminance detected by the illuminance sensor.

Technical Field

The present disclosure relates to a radiation imaging apparatus.

Background

Patent document 1 discloses an X-ray imaging apparatus in which an X-ray source (irradiation unit) and an X-ray detector (image receiving unit) are mounted on an arm bent in a C-shape. In the X-ray imaging apparatus described in patent document 1, by rotating the arm, the X-ray source can be moved in any direction of the top, bottom, left, and right of the subject while maintaining the facing relationship between the X-ray source and the X-ray detector. Thus, the X-ray imaging apparatus described in patent document 1 can be applied to two imaging methods, namely, a so-called outer tube method in which the X-ray source is disposed above the object and the X-ray detector is disposed below the object to perform imaging, and a so-called down tube method in which the X-ray source is disposed below the object and the X-ray detector is disposed above the object to perform imaging.

The X-ray imaging apparatus described in patent document 1 is provided with an irradiation range display unit that emits visible light indicating an irradiation range irradiated by the X-ray source, in each of the X-ray source and the X-ray detector. The 2 nd irradiation range display unit provided in the X-ray source includes a light source provided in a collimator of the X-ray source, and light of the light source is emitted toward the object through an irradiation opening of the collimator. Thereby, an irradiation range corresponding to the irradiation opening is displayed on the object.

The 1 st irradiation range display unit provided in the X-ray detector includes a laser light source, and displays the periphery of the irradiation field of the X-ray source by the laser light source.

Therefore, in the X-ray imaging apparatus described in patent document 1, even when imaging is performed by a low tube system in which the X-ray source is disposed below the subject, the 1 st irradiation range display unit is provided on the X-ray detector disposed above the subject, and therefore, the irradiation field of the X-ray source can be displayed by the 1 st irradiation range display unit.

Patent document 1: WO2014/148266 publication

The down tube system is generally used for moving image photography during surgery, but in surgery, the irradiation field is rarely displayed using visible light. The main purpose of displaying the irradiation field using visible light is to appropriately set the irradiation field to the treatment target site to be operated, and to confirm the treatment without irradiation of radiation. Further, when a puncture needle is disposed at a treatment target site or a thin tube such as a catheter is inserted, the area of the treatment target site may be very small.

In consideration of this, the X-ray imaging apparatus described in patent document 1 has the following problems. That is, the 1 st irradiation range display unit described in patent document 1 is a system in which the periphery of the irradiation field is indicated by a linear laser beam. When the irradiation field is appropriately set with respect to the central region of the treatment target portion, it is difficult to clearly confirm the central position of the irradiation field if the periphery of the irradiation field is linearly expressed by using the laser beam. In particular, when the area of the treatment target region is very small relative to the area of the irradiation field whose periphery is represented by a line, the distance between the periphery of the irradiation field and the center position of the irradiation field is long, and therefore it is difficult to estimate the center position from the periphery, and it is difficult to align the center position of the irradiation field with the center position of the treatment target region. When the size of the irradiation opening is adjusted to reduce the irradiation field when the center position of the irradiation field does not coincide with the center position of the treatment target portion, there is a possibility that the treatment target portion may be deviated from the irradiation field.

Further, the surface of the object to be irradiated, which is irradiated with light, such as the surface of the object or the outer surface of a sheet covering the object during surgery, is not flat but undulated. When the surface to be irradiated has undulations, linear light representing the periphery of the irradiation field is curved along with the undulations on the surface to be irradiated, and therefore, linear display is not performed. This is one of the reasons why it is difficult to grasp the center position of the irradiation field in a manner of displaying the periphery of the irradiation field.

Disclosure of Invention

An object of the technique according to the present disclosure is to provide a radiation imaging apparatus capable of appropriately representing an irradiation field in an outer tube system and easily grasping the center position of the irradiation field before radiation irradiation as compared with the conventional art even when imaging is performed in the following tube system.

A radiation imaging apparatus according to claim 1 of the present disclosure includes: an irradiation unit that irradiates radiation; an arm to which the irradiation section is attached, the arm being capable of attaching the image receiving section and the irradiation section that receive radiation to positions that face each other with the subject interposed therebetween, and being capable of reversing a positional relationship between the irradiation section and the image receiving section with respect to the subject by rotating the arm; a 1 st light source which is provided in the irradiation portion and emits visible light representing an irradiation field of radiation; and a 2 nd light source which is provided in the image receiving section and emits visible light indicating a center position of an irradiation field of the radiation irradiated by the irradiation section.

In the radiation imaging apparatus according to claim 1, the positional relationship between the image receiving section and the irradiation section facing each other across the object can be moved by rotating the arm. This makes it possible to irradiate the irradiation portion with radiation in a state where the irradiation portion is disposed below the object and the image receiving portion is disposed above the object (low tube method).

The image receiving unit further includes a 2 nd light source that emits visible light indicating a center position of an irradiation field of the radiation irradiated by the irradiation unit. Thus, even when imaging is performed in the following tube method, it is easier to grasp the center position of the irradiation field before irradiation with radiation, compared to the conventional technique of emitting visible light indicating the periphery of the irradiation field.

A radiation imaging apparatus according to claim 2 of the present disclosure is the radiation imaging apparatus according to claim 1, wherein the irradiation portion can continuously irradiate radiation to perform moving image imaging.

As described in the problem, the necessity of indicating the center position of the irradiation field is particularly high when moving image photographing is performed, compared to the case of performing still image photographing. In the radiation imaging apparatus according to the 2 nd aspect, since the image receiving unit includes the 2 nd light source, the center position of the irradiation field can be indicated when moving image capturing is performed.

A radiation imaging apparatus according to claim 3 of the present disclosure is the radiation imaging apparatus according to claim 1 or 2, wherein the 2 nd light source is a laser light source.

In the radiation imaging apparatus according to the 3 rd aspect, the 2 nd light source is a laser light source. The laser light source has a narrow divergence angle and high directivity as compared with other light sources such as an LED light source and a halogen lamp. Therefore, the light source is suitable for easily emitting light representing 1 point and linear or planar light and displaying the center position of the irradiation field.

A radiation imaging apparatus according to claim 4 of the present disclosure is the radiation imaging apparatus according to any one of claims 1 to 3, wherein the 2 nd light source is a light source that forms a plurality of light fluxes that linearly irradiate a surface of the subject and intersect on the surface as visible light, and the center position of the irradiation field can be represented by an intersection of the plurality of light fluxes.

In the radiation imaging apparatus according to the 4 th aspect, the center position of the irradiation field can be represented by the intersection of the lines extending linearly on the surface of the object. This makes it easy for the operator of the radiation imaging apparatus to clearly visually recognize the center position. Further, it is particularly effective when there is undulation on the surface of the object.

A radiation imaging apparatus according to claim 5 of the present disclosure is the radiation imaging apparatus according to any one of claims 1 to 4, wherein the 1 st light source is an LED light source.

In the radiation imaging apparatus according to the 5 th aspect, the 1 st light source is an LED light source. The LED light source can be miniaturized compared to a halogen lamp or the like. Further, since the divergence angle is wider than that of the laser light source, it is suitable as a light source for irradiating the entire region of the irradiation field.

A radiation imaging apparatus according to claim 6 of the present disclosure is the radiation imaging apparatus according to any one of claims 1 to 5, wherein at least one of the 1 st light source and the 2 nd light source is a color-changeable light source.

With the radiation imaging apparatus according to the 6 th aspect, at least one of the 1 st light source and the 2 nd light source can be changed in color. By changing the color, the user of the radiation imaging apparatus can be changed to a color with high visibility.

A radiation imaging apparatus according to claim 7 of the present disclosure is the radiation imaging apparatus according to claim 6, wherein the color-changing light source includes a plurality of light emitting elements emitting different colors.

In the radiation imaging apparatus according to claim 7, the variable color light source includes a plurality of light emitting elements emitting different colors. This allows a wider range of colors to be changed than in the case where only the single-color light-emitting element is provided.

A radiation imaging apparatus according to claim 8 of the present disclosure is the radiation imaging apparatus according to claim 6 or 7, which includes a color sensor that detects a color of the subject, and a color adjustment unit that adjusts a color of light emitted by the color-changing light source according to the color detected by the color sensor.

In the radiation imaging apparatus according to the 8 th aspect, the color adjusting section adjusts the color of light in accordance with the color of the object detected by the color sensor. This enables easy color change.

A radiation imaging apparatus according to a 9 th aspect of the present disclosure is the radiation imaging apparatus according to any one of the 1 st to 8 th aspects, including a light amount adjustment unit that adjusts a light amount of at least one of the 1 st light source and the 2 nd light source.

In the radiation imaging apparatus according to the 9 th aspect, the light amount adjustment unit adjusts the light amount of the light. This makes it possible to adjust the light amount to a light amount with high visibility.

A radiation imaging apparatus according to a 10 th aspect of the present disclosure is the radiation imaging apparatus according to the 9 th aspect, wherein the radiation imaging apparatus includes an illuminance sensor that detects ambient illuminance, and the light quantity adjustment unit adjusts the light quantity of the visible light representing the irradiation field in accordance with the illuminance detected by the illuminance sensor.

In the radiation imaging apparatus according to the 10 th aspect, the light amount adjustment unit adjusts the light amount of the visible light representing the irradiation field in accordance with the illuminance detected by the illuminance sensor. This makes it possible to adjust the amount of light with high visibility according to the ambient illuminance.

Effects of the invention

According to the present disclosure, it is possible to provide a radiation imaging apparatus capable of appropriately representing an irradiation field in an outer tube system and easily grasping the center position of the irradiation field before radiation irradiation as compared with the conventional one even in the case of performing imaging in the following tube system.

Drawings

Fig. 1 is an overall perspective view illustrating a radiation imaging apparatus according to embodiment 1.

Fig. 2A is a side view of the radiation imaging apparatus according to embodiment 1.

Fig. 2B is a side view showing a state in which the arm of the radiation imaging apparatus shown in fig. 2A is rotated in the direction of an arrow M1.

Fig. 2C is a side view showing a state in which the arm of the radiation imaging apparatus shown in fig. 2A is rotated in the direction of an arrow M2.

Fig. 3A is a front view of the radiation imaging apparatus according to embodiment 1.

Fig. 3B is a side view showing a state in which the arm of the radiation imaging apparatus shown in fig. 3A is rotated in the direction of an arrow N1.

Fig. 3C is a side view showing a state in which the arm of the radiation imaging apparatus shown in fig. 3A is rotated by 180 ° in the direction of an arrow N2.

Fig. 4 is a cross-sectional view showing a state in which the radiation imaging apparatus according to embodiment 1 is used in an outer shell posture.

Fig. 5 is a cross-sectional view showing the 1 st light source provided in the irradiation portion in the radiation imaging apparatus according to embodiment 1.

Fig. 6 is a cross-sectional view showing a state in which the radiation imaging apparatus according to embodiment 1 is used in a lower posture.

Fig. 7 is a cross-sectional view showing a 2 nd light source provided in an image receiving section in the radiation imaging apparatus according to embodiment 1.

Fig. 8 is a cross-sectional view showing a state where visible light is irradiated from the 2 nd light source provided in the image receiving section in the radiation imaging apparatus according to embodiment 1.

Fig. 9 is a cross-sectional view showing a state in which visible light is irradiated from the 2 nd light source provided in the image receiving section in the radiation imaging apparatus according to embodiment 1 to an object having irregularities.

Fig. 10 is a block diagram showing a functional configuration of the radiation imaging apparatus according to embodiment 1.

Fig. 11 is a block diagram showing a functional configuration of the radiation imaging apparatus according to embodiment 2.

Fig. 12 is a sectional view showing a state in which the radiation imaging apparatus according to embodiment 3 is used in an outer sheath posture.

Description of the symbols

10. 40, 42-radiation imaging device, 12-arm, 14-support, 16-body, 18-irradiation, 20-image reception, 20A-image reception, 20B-frame, 20C-image detector, 22A-rail fitting, 22B-rail, 24-support shaft, 26-caster, 28-control f, 28A-irradiation control, 28B-light source control, 28C-image reception control, 28 CC-image acquisition, 30-operation panel, 31-radiation source, 32-radiation tube, 34-irradiation field limiter, 34A-irradiation opening, 34B-shield, 36-rotation shaft, 38-mounting plate, 50-1 st light source, 52-1 st light source unit, 52B-blue LE D element (light emitting element), 52G-green LED element (light emitting element), 52R-red LED element (light emitting element), 54-optical mirror, 60X, 60Y-2 nd light source, 70-photosensor, 72-color sensor, 74-illuminance sensor, E1-light beam, E2-light beam, E12-intersection of light beams, H-object, HA-surface, L-visible light, LX-visible light, LY-visible light, O2-center position of image-receiving surface, P1-radiation image, P2-color image, R-focus position, S-bed, X-radiation.

Detailed Description

Hereinafter, the radiation imaging apparatus according to embodiments 1 to 3 of the present disclosure will be described in order with reference to the drawings. In the figure, arrow X indicates the front-rear direction of the radiation imaging apparatus, arrow Y indicates the width direction of the radiation imaging apparatus, and arrow Z indicates the vertical direction.

< embodiment 1 >

First, a radiation imaging apparatus according to embodiment 1 of the present disclosure will be described with reference to fig. 1 to 11.

(integral construction of radiation imaging apparatus)

The radiation imaging apparatus 10 of the present embodiment shown in fig. 1 is an apparatus for imaging a radiation image of a subject H. The radiation imaging apparatus 10 can perform, for example, moving image imaging and still image imaging of the subject H. Moving image shooting is performed, for example, when a processing target region of the subject H is displayed as a moving image during surgery (also referred to as fluoroscopy). In the moving image capturing, for example, a moving image of the subject H is displayed on a monitor, not shown, provided separately from the radiation imaging apparatus 10. Of course, the data of the photographed moving image may be stored in the memory of the radiation imaging apparatus 10. In the case of still image imaging, the still image to be imaged may be displayed on a monitor or stored in a memory of the radiation imaging apparatus 10.

As shown in fig. 1, the radiation imaging apparatus 10 includes an arm 12 (referred to as a C-arm or the like) having a C-shaped side surface (circular arc shape) and a main body 16 to which a support portion 14 is attached. In the following, the side of the radiation imaging apparatus 10 where the arm 12 is provided is set to the front of the radiation imaging apparatus 10, and the side where the main body portion 16 is provided is set to the rear of the radiation imaging apparatus 10.

(Structure of arm)

The arm 12 has two ends, and an irradiation unit 18 is provided at one end of the arm 12 and an image receiving unit 20 is provided at the other end. The arm 12 can hold the irradiation section 18 and the image receiving section 20 in an opposed posture.

An interval is secured between the irradiation unit 18 and the image receiving unit 20 so that the subject H and the bed S on which the subject H lies on the back can be inserted. That is, the arm 12 is provided so that the image receiving section 20 and the irradiation section 18 that receive radiation can be mounted at positions facing each other with the subject H interposed therebetween. Hereinafter, in a side view of the arm 12 (a direction viewed from the Y direction in fig. 1), a direction in which the irradiation portion 18 and the image receiving portion 20 are provided may be referred to as a front of the arm 12 and a side of the support portion 14 may be referred to as a rear of the arm 12.

As shown in fig. 2A, the arm 12 is provided so as to be rotatable about at least 2 different axes M (axes parallel to the Y axis) or N (axes parallel to the X axis) with respect to the main body 16. Specifically, the support portion 14 is formed with a guide rail 22B. On the other hand, a rail fitting portion 22A to which the rail 22B is fitted is provided on the outer peripheral surface of the arm 12. The guide rail 22B has, for example, a groove shape, and a convex rail fitting portion 22A is fitted thereto. The rail fitting portion 22A has an arc shape along the shape of the arm 12. The guide rail 22B is also in the shape of a circular arc having the same radius as the circular arc of the arm 12.

The arm 12 is provided so as to be able to orbit around the axis M of the arc center of the arm 12 as a rotation center with respect to the support portion 14 and the main body portion 16 by the rail fitting portion 22A formed in the arm 12 sliding along the rail 22B formed in the support portion 14.

That is, as shown in fig. 2B and 2C, the arm 12 is configured to be able to orbit around the axis M in the direction of an arrow M1 (counterclockwise in fig. 2B) and the direction of an arrow M2 (clockwise in fig. 2C), respectively. This enables the irradiation unit 18 and the image receiving unit 20 provided at both ends of the arm 12 to rotate around the body axis (axis parallel to the Y axis) of the subject H (see fig. 1).

The support portion 14 includes a support shaft 24 extending in the front-rear direction of the radiographic imaging device 10, and the support shaft 24 is supported by the main body portion 16 via a bearing, not shown. As a result, as shown in fig. 3A to 3C, the support portion 14 is allowed to rotate axially with respect to the body portion 16 with the axis N of the support shaft 24 as the rotation center, and the arm 12 is also allowed to rotate axially with respect to the body portion 16 together with the support portion 14.

That is, as shown in fig. 3B and 3C, the arm 12 is configured to be rotatable about the axis N in the direction of an arrow N1 (counterclockwise in fig. 3B) or in the direction of an arrow N2 (clockwise in fig. 3C). This makes it possible to reverse the positions of the irradiation unit 18 and the image receiving unit 20 provided at both ends of the arm 12 with respect to the vertical direction (Z-axis direction) of the subject H (see fig. 1). In other words, the positional relationship of the irradiation unit 18 and the image receiving unit 20 with respect to the subject H can be reversed by the rotation arm 12.

Among these, the posture of the arm 12 in which the irradiation section 18 is disposed above the image receiving section 20 shown in fig. 3A is referred to as an outer tube posture or the like because the radiation tube 32 (see fig. 1) included in the irradiation section 18 is located above the subject H. On the other hand, the posture of the arm 12 in which the irradiation unit 18 is disposed below the image receiving unit 20 as shown in fig. 3C is referred to as a "down posture" because the radiation tube 32 is located below the subject H. Hereinafter, a mode in which imaging is performed with the arm 12 in the outer tube posture is referred to as an outer tube mode, and a mode in which imaging is performed with the arm 12 in the down tube posture is referred to as a down tube mode.

The outer tube system can enlarge the distance between the irradiation portion 18 and the object H (see fig. 1) compared to the down tube system, and thus can photograph a relatively wide area. Therefore, the overtube method is mainly used when a still image of the subject H is photographed. On the other hand, in the down tube system, since the radiation irradiated from the irradiation portion 18 is partially shielded by the bed S or the like, the radiation dose to a doctor, an operator or the like (not shown) around the subject H (see fig. 1) can be reduced. Therefore, the down tube system is used when a moving image of the subject H is imaged by continuously irradiating radiation.

(Structure of body section)

As shown in fig. 1, the main body 16 of the radiation imaging apparatus 10 is provided with a plurality of casters 26 at a lower portion thereof, and is configured to be manually pushed by an operator so as to be able to travel in, for example, an operating room or a ward. That is, the radiation imaging apparatus 10 of the present embodiment is mobile.

The main body 16 includes a control device 28 for controlling each unit of the radiation imaging apparatus 10 such as the irradiation unit 18, and a touch panel type operation panel 30, for example. The configuration of the control device 28 will be described in detail later.

The operation panel 30 functions as an operation unit for operating each unit of the radiation imaging apparatus 10, such as the irradiation unit 18, by inputting an operation command to the unit, and functions as a display unit for displaying various information, such as a warning message and a radiation image output from the image receiving unit 20. In addition, the main body portion 16 includes various switches, not shown, such as a power switch of the radiation imaging apparatus 10, a power supply circuit for supplying power to each portion of the radiation imaging apparatus 10, a battery, and the like.

(Structure of irradiation part)

The irradiation unit 18 has a radiation tube 32 that generates radiation from the focal position R, and irradiates the radiation. Specifically, the irradiation unit 18 includes a radiation source 31 and an irradiation field limiter 34. The radiation source 31 includes a radiation tube 32 that generates radiation. The radiation is, for example, X-rays. The radiation tube 32 generates radiation by causing electrons generated from the cathode to collide with a target (anode). The position where the electrons collide with the target becomes a focal position R from which the radiation is radiated.

As shown in fig. 4, an irradiation field limiter 34 is provided below the radiation source 31. The irradiation field limiter 34 (also referred to as a collimator or the like) has a rectangular irradiation opening 34A (refer to fig. 1). The radiation generated in the radiation tube 32 is irradiated to the subject H through the irradiation opening 34A. The irradiation field limiter 34 can adjust the opening area of the irradiation opening 34A. The irradiation field limiter 34 has, for example, 4 shield plates 34B that shield radiation. In fig. 4, only 2 shield plates 34B facing each other in the X direction among the 4 shield plates 34B are shown. Each side of the 4 shield plates 34B corresponds to each side of the irradiation opening 34A, and defines the irradiation opening 34A. By changing the position of the shielding plate 34B to adjust the aperture area of the irradiation aperture 34A, the irradiation field of the radiation irradiated from the irradiation section 18 is changed.

As shown in fig. 1, the irradiation portion 18 is provided so as to be rotatable with respect to the arm 12 around the axis of the rotation shaft 36 extending in the width direction (Y direction in fig. 1) of the radiation imaging apparatus 10 as a rotation center.

The irradiation unit 18 is connected to the control device 28 of the main body unit 16 shown in fig. 1, a power supply circuit, and the like, which are not shown, via a cable, not shown, in which a signal line for transmitting a control signal and a power supply line for power supply are wired.

(construction of image receiving section)

As shown in fig. 1, the image receiving unit 20 is provided at the other end of the arm 12, which is a position facing the irradiation unit 18. The image receiving unit 20 includes an image detector 20C (see fig. 7) in the housing 20B. The image receiving unit 20 includes an image receiving surface 20A that receives the radiation irradiated from the irradiation unit 18 and transmitted through the subject H. The image receiving surface 20A is a surface on which radiation bearing information of the subject H is incident, and is disposed at a position corresponding to the detection surface of the image detector 20C.

The image detector 20C is, for example, a Flat Panel Detector (FPD) of a Digital Radiography (DR) system. The FPD has a detection surface on which a plurality of pixels are two-dimensionally arranged, and a Thin Film Transistor (TFT) panel (not shown) for driving the pixels. The radiation is incident on the detection surface of the image detector 20C through the image receiving surface 20A. The image detector 20C converts the incident radiation into an electric signal, and outputs a radiation image representing the subject H according to the converted electric signal. As the image detector 20C, for example, an indirect conversion type is used which converts radiation into visible light by a scintillator and converts the converted visible light into an electric signal. The image detector 20C may be a direct conversion type that converts radiation into a direct electric signal. The Image receiving unit 20 may be configured other than the FPD, and may be configured by combining an Image Intensifier (I.I; Image Intensifier) and a camera, for example.

The image receiving unit 20 is connected to the control device 28 of the main body 16, a power supply circuit, and the like, which are not shown, via a cable, not shown, in which signal lines for transmitting control signals and power supply lines are wired.

(1 st light source)

Fig. 4 schematically shows the arrangement of the irradiation unit 18, the subject H, the bed S, and the image receiving unit 20 in the case of performing the external cannula type imaging. As described above, in the outer tube system, the radiation X is irradiated from the focal position R of the radiation tube 32 to the subject H to perform still image imaging. When still image photographing is performed, the size of the irradiation opening 34A of the irradiation field limiter 34 is adjusted to change the irradiation field of the radiation irradiated from the irradiation section 18. This adjusts the irradiation field of the radiation X to the size of the imaging region.

The irradiation unit 18 is provided with a 1 st light source 50 that emits visible light L indicating an irradiation field of the radiation X. The 1 st light source 50 is disposed inside the irradiation field limiter 34.

As shown in fig. 5, an optical mirror 54 is disposed in the irradiation field limiter 34 on an irradiation path through which the radiation X passes. The optical mirror 54 reflects the visible light L and transmits the radiation X. The 1 st light source 50 is disposed on a side of the optical mirror 54 deviated from the irradiation path of the radiation X. The optical mirror 54 is obliquely arranged to reflect the visible light L from the 1 st light source 50 toward the irradiation opening 34A on the irradiation path. Since the visible light L passes through the same irradiation opening 34A as the radiation X, the irradiation field is limited as the radiation X. Therefore, the irradiation field of the visible light L coincides with the irradiation field of the radiation X.

The visible light L reaches the surface HA of the object H after passing through the irradiation opening 34A. Thereby, the irradiation field of the radiation X on the surface HA of the object H is represented by the visible light L. The 1 st Light source 50 is, for example, a white LED (Light Emitting Diode).

(2 nd light source)

Fig. 6 schematically shows the arrangement of the image receiving unit 20, the subject H, the bed S, and the irradiation unit 18 in the case of performing imaging in the following tube method. In the down tube system, the radiation X is irradiated upward from below the subject H to perform moving image capturing. In the case of moving image imaging, the size of the irradiation opening 34A of the irradiation field limiter 34 is adjusted to change the irradiation field of the radiation irradiated from the irradiation unit 18, as in the case of still image imaging. This adjusts the irradiation field of the radiation X to the size of the imaging region.

The irradiation unit 18 can continuously irradiate radiation to perform moving image photographing. When the radiation is continuously irradiated, the irradiation includes so-called pulse irradiation in which irradiation is repeated for a short time at preset minute time intervals, in addition to continuous irradiation in which the radiation is continuously irradiated.

The focal position R of the radiation tube 32 and the center position 02 of the image receiving surface 20A are arranged so as to coincide with each other in the X-Y plane parallel to the image receiving surface 20A. Specifically, the radiation tube 32 is disposed such that the center position O2 of the image receiving surface 20A is located on an extension CL3 of the focal position R in the Z direction.

The focal point position R of the radiation tube 32 and the center position of the irradiation opening 34A are also arranged so as to coincide with each other in the X-Y plane. Therefore, the center position of the irradiation field of the radiation X passing through the irradiation aperture 34A coincides with the position of the focal position R in the X-Y plane.

The image receiving unit 20 is provided with a 2 nd light source 60X and a 2 nd light source 60Y, and the 2 nd light source 60X and the 2 nd light source 60Y emit visible light indicating a center position of an irradiation field of the radiation X irradiated by the irradiation unit 18. More specifically, the central position of the irradiation field of the radiation X indicated by the 2 nd light source 60X and the 2 nd light source 60Y is the central position of the irradiation field of the radiation X on the surface HA of the subject H.

In the following description, these 2 nd light source 60X and 2 nd light source 60Y may be collectively referred to as the 2 nd light source 60.

As shown in fig. 7, the 2 nd light source 60X and the 2 nd light source 60Y are provided inside the housing 20B of the image receiving unit 20. The 2 nd light source 60X and the 2 nd light source 60Y are, for example, laser light sources. The 2 nd light source 60X and the 2 nd light source 60Y are disposed outside the image detector 20C inside the housing 20B.

The 2 nd light source 60X is disposed on an extension line CL1 of the center position 02 of the image receiving surface 20A in the X direction. The 2 nd light source 60Y is disposed on an extension CL2 of the center position O2 of the image receiving surface 20A in the Y direction.

As shown in fig. 8, the visible light L emitted from the 2 nd light source 60X forms a light beam LX that diverges as it moves from the light emitting point in the Z direction. The light flux LX is a planar light flux having a triangular shape with a light emitting point as a vertex in an X-Z plane along the X direction and the Z direction, and the light flux LX linearly irradiates the surface HA of the object H in the X direction when viewed from the Z direction. Line E1 is the line formed by the light beam LX on the surface HA.

The visible light L emitted from the 2 nd light source 60Y forms a light beam LY that diverges as it moves in the Z direction from the light emitting point. The light flux LY is a planar light flux having a triangular shape with a light emitting point as a vertex in a Y-Z plane along the Y direction and the Z direction, and is a light flux linearly irradiating the surface HA of the object H in the Y direction when viewed from the Z direction. Line E2 is the line formed on the surface HA by the light beam LY.

The line E1 and the line E2 intersect with each other, and an intersection E12 is formed on an extension of the center position 02 of the image receiving surface 20A in the Z direction. Thus, the 2 nd light source 60X and the 2 nd light source 60Y are light sources that form a plurality of light fluxes LX and light fluxes LY intersecting on the surface HA. As described above, the center position 02 of the image receiving surface 20A is located on the extension line CL3 of the focal position R in the radiation tube 32 in the Z direction. Therefore, the intersection E12 indicates the focal position R of the radiation on the surface HA of the subject H.

As shown in fig. 9, actually, the surface HA of the object H is not a flat surface. For example, when the surface HA of the subject H is a surface of the body, the surface of the body is a curved surface and naturally HAs undulations. When the subject H is covered with the surgical drape, the surface HA becomes the surface of the surgical drape. The surface of the surgical drape is not a flat surface, and wrinkles and the like are formed in addition to undulations conforming to the shape of the surface of the surgical drape.

However, as shown in fig. 8, the light beam LX and the light beam LY are triangular planar light beams having the light emitting point as the vertex on the Z-X plane and the Z-Y plane, respectively, and the light beam LX and the light beam LY are light beams linearly irradiating the surface HA in the X direction and the Y direction, respectively, when viewed from the Z direction. Therefore, as shown in fig. 9, even when the surface HA is not a flat surface, the lines E1 and E2 formed on the surface HA extend in the X direction and the Y direction in accordance with the undulation of the surface HA. The intersection E12 of the lines E1 and E2 corresponds to the center position of the radiation X irradiation field. In this manner, by using the 2 nd light source 60X and the 2 nd light source 60Y, the center position of the irradiation field of the radiation is represented on the surface HA of the object H regardless of the shape of the surface HA of the object H.

(functional Structure of radiographic apparatus)

Fig. 10 is a block diagram of the functional configuration of the radiation imaging apparatus 10, centering on the functional configuration for controlling the 1 st light source 50, the 2 nd light source 60X, and the 2 nd light source 60Y. The radiation imaging apparatus 10 includes a control device 28. The control device 28 includes an irradiation control unit 28A, a light source control unit 28B, and an image reception control unit 28C.

The irradiation control unit 28A controls irradiation with the radiation X by the irradiation unit 18. The image reception control unit 28C controls the image detector of the image reception unit 20. The irradiation control unit 28A and the image reception control unit 28C cooperate with each other to perform control related to moving image shooting and still image shooting.

When moving image capturing is performed, the irradiation control unit 28A causes the irradiation unit 18 to continuously irradiate the radiation X. On the other hand, the image reception control unit 28C operates the image detector 20C of the image reception unit 20 in synchronization with the irradiation by the irradiation unit 18. In the case of moving image shooting, basically, no irradiation time is set as the shooting conditions, and commands for starting and ending the moving image shooting are performed through the operation panel 30. When an operation command from the operation panel 30 is input to the irradiation control section 28A, the irradiation control section 28A starts irradiation of radiation from the irradiation section 18 under a preset imaging condition. Of course, the start and end of moving image shooting may be instructed by a foot switch or the like other than the operation panel 30.

In moving image shooting, the image detector 20C repeats an image detection operation at a predetermined frame rate. The image output from the image detector 20C is sent to the image acquisition unit 28CC of the image reception control unit 28C. The image reception control unit 28C sequentially outputs the received images to a monitor not shown. This causes the monitor to display a moving image of the subject H.

When still image imaging is performed, the irradiation control unit 28A causes the irradiation unit 18 to perform irradiation of the still image radiation X. In still image imaging, the irradiation control unit 28A operates the image detector 20C of the image receiving unit 20 in synchronization with the irradiation timing of the still image radiation X by the irradiation unit 18. For example, an instruction for still image shooting is given by an unillustrated irradiation switch connected to the receiving unit 28D. In the case of performing still image photography, the irradiation time is, for example, an amount of time from several tens milliseconds to several hundreds milliseconds. When a command for still image shooting is input to the irradiation control unit 28A via the receiving unit 28D, the irradiation control unit 28A operates the irradiation unit 18 in accordance with preset shooting conditions. In the case of still image shooting, since the irradiation time is set in the shooting conditions, the irradiation by the irradiation unit 18 is terminated when the set irradiation time elapses.

When the irradiation is completed, the image detector 20C starts outputting the detected image. The image output from the image detector 20C is sent to the image acquisition unit 28CC of the image reception control unit 28C. The image acquisition unit 28CC stores the acquired still image data in a memory, not shown. The stored still image is displayed on a monitor not shown. Thereby, a still image of the subject H is displayed on the monitor. Further, in order to confirm the photographed still image immediately after photographing, the still image may be displayed on the operation panel 30.

The irradiation control unit 28A controls a motor M (see fig. 10) connected to the shield plate 34B of the irradiation field limiter 34 shown in fig. 5, thereby adjusting the size of the irradiation opening 34A. An adjustment command for the irradiation opening 34A is input from the operation panel 30.

The light source control unit 28B controls the 1 st light source 50 provided in the irradiation unit 18 and the 2 nd light source 60 provided in the image receiving unit 20 in accordance with a lighting command from the operation panel 30. In the light source control unit 28B, a lighting command from the operation panel 30 is input through the receiving unit 28D. The light source control unit 28B turns on any one of the 1 st light source 50 and the 2 nd light source 60 in accordance with a lighting command for any one of the 1 st light source 50 and the 2 nd light source 60.

(action)

The operation based on the above-described structure will be described. When a still image is taken of the subject H on the bed S using the radiographic imaging apparatus 10, the still image is taken, for example, by an outer tube system shown in fig. 4. Specifically, the operator mounts the arm 12 in an outer tube posture in which the irradiation section 18 is disposed above the subject H and the image receiving section 20 is disposed below the subject H. When still image shooting is performed, the operator operates the operation panel 30 to turn on the 1 st light source 50. When the 1 st light source 50 is turned on, the visible light L from the 1 st light source 50 is irradiated to the object H through the irradiation opening 34A. When the size of the irradiation aperture 34A is adjusted, the size of the irradiation field of the visible light L also changes according to the size of the irradiation aperture 34A.

The irradiation aperture 34A is an aperture to which the radiation X is irradiated, and hence an irradiation field of the radiation X is represented by the visible light L of the 1 st light source 50. Thus, the operator can confirm the irradiation field of the radiation X by the visible light L. The operator adjusts the irradiation field for still image shooting by adjusting the relative positional relationship between the arm 12 and the subject H and the irradiation opening 34A while checking the irradiation field indicated by the visible light L. After the adjustment of the irradiation field is completed, still image imaging is performed using the radiation X. Since the irradiation field is set to an appropriate position and size, an appropriate radiation image representing a desired imaging region can be obtained.

When the subject H on the bed S is imaged with a moving image using the radiation imaging apparatus 10, the moving image is taken, for example, in a down tube system as shown in fig. 6. Specifically, the operator mounts the arm 12 in a lower posture in which the irradiation section 18 is disposed below the subject H and the image receiving section 20 is disposed above the subject H. Moving image photographing is performed during surgery. Before the start of the operation, the operator sets the irradiation field of the radiation X at the time of imaging the moving image of the treatment target region to be operated. When the operator performs the moving image shooting, the operator operates the operation panel 30 to turn on the 2 nd light source 60X and the 2 nd light source 60Y.

When the 2 nd light source 60X and the 2 nd light source 60Y are turned on, the visible light L emitted from the 2 nd light source 60X and the 2 nd light source 60Y forms the light beam LX and the light beam LY shown in fig. 8. The light beam LX and the light beam LY linearly irradiate the surface HA of the object H in the X direction and the Y direction, respectively. Thereby, the line E1 and the line E2 are formed on the surface HA. The line E1 and the line E2 intersect each other, and the center position of the irradiation field of the radiation X is indicated by an intersection E12.

The operator checks the position of the intersection E12 to check whether or not the center position of the radiation X irradiation field matches the center position of the treatment target region. In the case of a positional deviation, the position of the arm 12 is adjusted. After the adjustment of the center position of the irradiation field and the center position of the treatment target portion is completed, the size of the irradiation aperture 34A is adjusted as necessary to adjust the size of the irradiation field. Since the center position of the irradiation field coincides with the center position of the treatment target portion, the center position of the treatment target portion does not deviate from the irradiation field even when the size of the irradiation field is reduced.

After the adjustment of the irradiation field is completed, the operation is started, and a moving image is taken using the radiation X simultaneously with the operation. Since the center position of the irradiation field of the radiation X coincides with the center position of the treatment target portion, the center position of the treatment target portion is displayed on the center position of the screen of the monitor on which the moving image is displayed. Therefore, the doctor can perform the operation while checking the state of the treatment target site with the monitor.

(Effect)

As described above, according to the radiation imaging apparatus 10 according to embodiment 1, the positional relationship between the image receiving section 20 and the irradiation section 18 facing each other across the object H can be reversed by rotating the arm 12 (see fig. 3A to 3C). This enables photographing in the outer tube system shown in fig. 4 and the down tube system shown in fig. 6.

As shown in fig. 5, since the 1 st light source 50 indicating the irradiation field of the radiation X is provided in the irradiation portion 18, in the case of performing still image imaging by the outside sleeve system, the irradiation field can be confirmed by the visible light L before imaging using the radiation X. Therefore, a still image (radiation image) in which the irradiation field is set within an appropriate range can be obtained without using unnecessary radiation X that does not contribute to the formation of a radiation image.

As shown in fig. 8, the image receiving unit 20 includes a 2 nd light source 60, and the 2 nd light source 60 emits visible light indicating a center position of an irradiation field of the radiation X irradiated by the irradiation unit 18. Thus, even when moving image capturing is performed in the following tube method, it is easier to grasp the center position of the irradiation field before the irradiation with the radiation X, compared to the conventional technique in which visible light indicating the periphery of the irradiation field is emitted.

For example, when a treatment target site is treated with a puncture needle or a thin tube such as a catheter is inserted as an operation, the area of the treatment target site may be very small.

In this case, in the conventional method in which the periphery of the irradiation field is linearly expressed by using a laser beam, it is difficult to clearly confirm the center position of the irradiation field at a glance. In particular, when the area of the treatment target region is very small relative to the area of the irradiation field whose periphery is represented by a line, the distance between the periphery of the irradiation field and the center position of the irradiation field is long, and therefore it is difficult to estimate the center position from the periphery, and it is difficult to align the center position of the irradiation field with the center position of the treatment target region. When the size of the irradiation opening is adjusted to reduce the irradiation field when the center position of the irradiation field does not coincide with the center position of the treatment target portion, there is a possibility that the treatment target portion may be deviated from the irradiation field.

In contrast, according to the technique of the present disclosure, since the 2 nd light source 60 can indicate the center position of the irradiation field, it is easier to grasp the center position of the irradiation field than in the related art, and as a result, it is easier to align the center position of the irradiation field with the center position of the treatment target portion. Further, as long as the center position of the irradiation field coincides with the center position of the treatment target portion, the center position of the treatment target portion is less likely to be deviated from the irradiation field even when the size of the irradiation opening 34A is adjusted. As described above, according to the technique of the present disclosure, advantageous effects can be obtained as compared with the conventional art.

In the radiation imaging apparatus 10 of the present example, the irradiation unit 18 is provided to be able to continuously irradiate radiation to perform moving image shooting. Moving image imaging is generally performed as imaging of a treatment target site during surgery. In this case, as described above, it is important that the center position of the irradiation field coincides with the center position of the treatment target portion. The technique of the present disclosure is particularly effective for the radiation imaging apparatus 10 capable of moving image photographing. In still image shooting, the center position of the irradiation field may need to be indicated. Therefore, the technique of the present disclosure may also be applied to the radiation imaging apparatus 10 capable of only still image photographing.

In the radiation imaging apparatus 10 of the present example, the 2 nd light source 60 is a laser light source. The laser light source has a narrow divergence angle and high directivity compared to other light sources such as an led light source and a halogen lamp. Therefore, light representing 1 point and light of the linear irradiation surface HA are easily irradiated. Therefore, the 2 nd light source that emits visible light indicating the center position of the irradiation field is preferably a laser light source.

As shown in fig. 8, the 2 nd light source 60 of the present example forms a plurality of light fluxes that linearly irradiate the surface HA of the subject H and intersect on the surface HA, so that the center position of the irradiation field of the radiation X can be indicated by the intersection point E12 of the plurality of light fluxes. This makes it easy for the operator of the radiation imaging apparatus 10 to clearly visually recognize the center position of the irradiation field. Further, such a light flux is particularly effective when there is undulation on the surface HA of the object H as shown in fig. 9.

In the radiation imaging apparatus 10 of the present example, the 1 st light source 50 is an LED light source. The LED light source can be miniaturized compared to a halogen lamp or the like. Further, since the divergence angle is wider than that of the laser light source, it is advantageous in the case of irradiating the entire region of the irradiation field. Therefore, as the 1 st light source that emits visible light indicating an irradiation field, an LED light source is preferable.

In the present embodiment, the 2 lines E1 and E2 are formed on the surface HA by the light flux LX and the light flux LY emitted from the 2 nd light sources 60X and 62Y, respectively, but 3 or more 2 nd light sources 60 may be provided. For example, the center position of the radiation irradiation field may be represented by the intersection of 3 or more lines formed by 3 or more light beams emitted from 3 or more light sources 60.

< embodiment 2 >

Next, a radiation imaging apparatus 40 according to embodiment 2 of the present disclosure will be described with reference to fig. 11. The main configuration of the radiation imaging apparatus 40 is the same as that of the radiation imaging apparatus 10 according to embodiment 1 shown in fig. 1 to 10, and therefore, description thereof is omitted, and differences will be mainly described below.

(functional Structure of radiographic apparatus)

As shown in fig. 11, the radiation imaging apparatus 40 includes a 1 st light source unit 52. The 1 st light source unit 52 is an example of a color-changing light source capable of changing the color of emitted light. The 1 st light source unit 52 includes 3 light emitting elements, i.e., a red LED element 52R, a green LED element 52G, and a blue LED element 52B, as a plurality of light emitting elements emitting different colors.

In the radiation imaging apparatus 40, the light source control unit 28B changes the color of light emitted from the light source unit 52 as a color-changing light source. The light source control unit 28B adjusts the light amount of the light source unit 52. Specifically, the light source control unit 28B adjusts the light amounts of the red LED element 52R, the green LED element 52G, and the blue LED element 52B, respectively.

The light source control unit 28B can change the color of light to any one of red, green, and blue by selectively lighting the red LED element 52R, the green LED element 52G, and the blue LED element 52B. When the red LED element 52R, the green LED element 52G, and the blue LED element 52B are lit at the same ratio, white light is generated. Then, the ratio of the amounts of light of the red LED element 52R, the green LED element 52G, and the blue LED element 52B is adjusted to generate light of each color. The light source control unit 28B changes the color of light emitted from the 1 st light source unit 52 by adjusting the ratio of the light amounts of the red LED element 52R, the green LED element 52G, and the blue LED element 52B.

In a state where the red LED element 52R, the green LED element 52G, and the blue LED element 52B are selectively turned on, the light source control section 28B adjusts the light amount by changing the light amount of the turned-on LED elements. When lighting 3 of the red LED element 52R, the green LED element 52G, and the blue LED element 52B, the light source control unit 28B adjusts only the light quantity by adjusting the light quantities at the same ratio, without changing the color.

In this manner, the light source control section 28B is an example of a color adjustment section that adjusts the color of light emitted by the color-changing light source and a light amount adjustment section that adjusts the light amount of the 1 st light source. Such color change and light amount adjustment are performed by an operation command from the operation panel 30.

(Effect)

With the radiation imaging apparatus 40 according to embodiment 2, the 1 st light source unit 52 as the 1 st light source can change the color. By changing the color, the color of the visible light L indicating the irradiation field can be changed to a color that is highly visible to the operator. For example, when the subject H is a human, since the body surface is a skin color, visibility can be improved by making the visible light L a color (for example, green) that is easily distinguishable from the human body.

The 1 st light source unit 52, which is an example of a color-changing light source, includes a plurality of light emitting elements (a red LED element 52R, a green LED element 52G, and a blue LED element 52B) that emit different colors. This increases the number of colors that can be changed compared to the case where only the single-color light-emitting element is provided. Therefore, the options of colors that can be selected according to the type of the subject and the environment are expanded.

The irradiation control unit 28A, which is an example of the light amount adjustment unit, adjusts the light amount of the light of the 1 st light source unit 52, which is an example of the 1 st light source. This enables adjustment to an appropriate light amount.

Although the 1 st light source unit 52 in the present embodiment is formed to include the red LED element 52R, the green LED element 52G, and the blue LED element 52B, the present invention is not limited thereto.

The number of light emitting elements of the 1 st light source unit 52 as a color-changing light source is not limited to 3, and may be 2 or more light emitting elements emitting different colors. The type of light source is not limited to the LED, and a halogen lamp, a fluorescent tube, or the like may be used. The number of light emitting elements of the color-changing light source may be 1. For example, even if the number of light emitting elements is 1, a plurality of colors can be generated by combining the light emitting elements with a phosphor that emits fluorescence of different colors with light emitted from the light emitting elements as excitation light.

The light source control unit 28B has been described as an example of adjusting the color and the light amount of the light of the 1 st light source unit 52, but may be a light source control unit that adjusts at least one of the color and the light amount of the light. If at least one of the color and the amount of light can be adjusted, the effect of adjusting the visibility of visible light can be obtained.

The light source control unit 28B may adjust at least one of the color and the amount of light of the 2 nd light source 60. By setting the light source 2 to be adjustable, the color and the light amount of the visible light L indicating the center position of the irradiation field can be appropriately adjusted according to the subject H, the environment, and the like.

The light source control unit 28B may control at least one of the 1 st light source unit 52 and the 2 nd light source 60, and does not need to control two light sources.

< embodiment 3 >

Next, a radiation imaging apparatus 42 according to embodiment 3 of the present disclosure will be described with reference to fig. 12. The main configuration of the radiation imaging apparatus 42 is the same as that of the radiation imaging apparatus 10 according to embodiment 1 shown in fig. 1 to 10, but as shown in fig. 12, an optical sensor 70 is provided in the radiation imaging apparatus 42. The light sensor 70 includes a color sensor 72 and an illuminance sensor 74.

The color sensor 72 is an example of a color sensor that detects the color of the subject H (the color of the surface HA), and the illuminance sensor 74 is an example of an illuminance sensor that detects the ambient illuminance. The color sensor 72 includes, for example, a color image sensor and an image processing unit for detecting the color of the subject H. As the color image sensor, for example, an image sensor in which an imaging surface is formed by a plurality of pixels, such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and a micro color filter arranged corresponding to each pixel are combined is used. The color sensor 72 images the surface HA of the subject H by a color image sensor, and is configured to be able to acquire the surface HA as a color image.

The image processing section of the color sensor 72 detects the color of the surface HA by analyzing the color image. The color sensor 72 transmits the detected color of the surface HA to the light source control section 28B.

The illuminance sensor 74 detects an ambient illuminance, which is an illuminance of an indoor environment in which the radiation imaging device 42 is installed. The "ambient illuminance" is the illuminance of ambient light that irradiates the surface HA of the object H. The "ambient light" includes light of a shadowless lamp or the like provided in the operating room, in addition to light generated from illumination of an indoor lighting apparatus or the like provided with the radiographic imaging device 42. The illuminance sensor 74 transmits the detected illuminance to the light source control unit 28B.

The light source control unit 28B changes the color of the color-changing light source (at least one of the 1 st light source 50 and the 2 nd light source 60) in accordance with the color of the subject H detected by the color sensor 72. The light source control unit 28B adjusts the light quantity of at least one of the 1 st light source 50 and the 2 nd light source 60 indicating the irradiation field according to the illuminance detected by the illuminance sensor 74.

Specifically, as in embodiment 2, the light source control unit 28B changes the color of the visible light L of the variable color light source to a color that is easily distinguishable from the color of the surface HA of the subject H. This improves the visibility of the visible light L. The light source control unit 28B adjusts the light amount of the color-changing light source according to the ambient illuminance, and for example, the illuminance of the visible light L also increases when the ambient illuminance is high.

As described above, in the radiation imaging apparatus 42 according to embodiment 3, the light source control section 28B as an example of the color adjustment section adjusts the color of light in accordance with the color of the surface HA in the subject H detected by the color sensor 72. Unlike embodiment 2, embodiment 3 uses the color sensor 72 and the illuminance sensor 74, and thus can easily change the color and the amount of light compared to embodiment 2.

In embodiment 3, an example was described in which both the color and the light amount are adjusted using both the color sensor 72 and the illuminance sensor 74, but both are not necessarily adjusted, and for example, at least one of the color and the light amount may be adjusted using at least one of the color sensor 72 and the illuminance sensor 74.

In the above embodiments, the LED light source is described as the 1 st light source 5() and the laser light source is described as the 2 nd light source 60, but the kind of the light source is not limited thereto. For example, a halogen lamp may be used as the 1 st light source 50, and an LED light source may be used as the 2 nd light source 60. Of course, as described above, an LED light source is preferable as the 1 st light source 50, and a laser light source is preferable as the 2 nd light source 60.

Further, although the example of the 2 nd light source 60 is described as a light source that forms a light beam that linearly irradiates the surface HA of the object H, a light source that irradiates a spot light indicating the center position of the irradiation field may be used. Of course, as described above, by using a light source that forms a light beam that linearly irradiates the surface HA of the object H as the 2 nd light source 60, even if there is a fluctuation on the surface HA as shown in fig. 9, the center position of the irradiation field can be accurately displayed. Therefore, as the 2 nd light source 60, the laser light source shown in the above embodiment is preferably used.

In the above embodiments, the C-arm having the C-shaped side surface is described as the arm 12, but the U-arm having the U-shaped side surface may be used. The U-arm can hold the irradiation unit 18, the image receiving unit 20, and the like in opposing postures, as in the C-arm.

In the above embodiment, the image receiving unit 20 may be detachably attached to the arm 12, or may be detachably attached to the arm 12. Further, by constituting the image receiving portion 20 by the image detector and a receiving portion that detachably receives the image detector, it is possible to detach only the image detector in a state where the receiving portion is attached to the arm 12. In this case, the housing portion may be non-detachable with respect to the arm 12, or may be detachable with respect to the arm 12. By providing at least the image detector detachably to the arm 12 in this manner, it is possible to selectively use image detectors having different screen sizes, for example.

In addition, although X-rays are described as an example of the radiation, the radiation is not limited to X-rays, and may be gamma rays or the like.

In each of the above embodiments, as a hardware configuration of a Processing Unit (Processing Unit) that executes various processes, such as the irradiation control Unit 28A, the light source control Unit 28B, and the image reception control Unit 28C, various processors (processors) as shown below can be used. As described above, various processors include general-purpose processors, i.e., CPUs, which execute software to function as various processing units, and processors, i.e., Programmable Logic Devices (PLDs), ASICs (Application Specific Integrated circuits), and the like, which have Circuit configurations designed specifically to execute Specific processes, such as FPGAs (Field Programmable Gate arrays), and the like, and which can change the Circuit configurations after manufacture.

The 1 processing unit may be constituted by 1 of these various processors, or may be constituted by a combination of 2 or more processors of the same kind or different kinds (for example, a combination of a plurality of FPGAs and/or a combination of a CPU and an FPGA). Further, a plurality of processing units may be constituted by 1 processor.

As an example in which a plurality of processing units are configured by 1 processor, there is a 1 st system in which 1 processor is configured by a combination of 1 or more CPUs and software, and the processor functions as a plurality of processing units. The 2 nd System uses a processor that realizes the functions of the entire System including a plurality of processing units by 1 Integrated Circuit (IC) Chip, as represented by a System On Chip (SoC). In this manner, 1 or more of the various processors described above are used as a hardware configuration to configure various processing units.

As the hardware configuration of these various processors, more specifically, a circuit (circuit) in which circuit elements such as semiconductor elements are combined can be used.