Radiographic imaging device and method for controlling the same

Abstract

The present invention provides a radiographic device and a control method for the radiographic device, wherein the radiographic device can suppress the irradiation of useless radiation that does not contribute to animation photography. The radiographic device comprises: an irradiation unit (18) having an irradiation opening (34A) for irradiating radiation; an image receiving unit (20) having an image receiving surface (20A) for receiving the radiation irradiated from the irradiation unit (18); an arm (12) rotatably supporting the irradiation unit at one end and supporting the image receiving unit at the other end in a posture in which the irradiation opening (34A) and the image receiving surface are opposite to each other; a solenoid (44) for locking the rotation of the irradiation unit relative to the arm in a facing posture in which the irradiation opening (34A) and the image receiving surface are opposite to each other; and a control unit (28) for allowing irradiation for animation photography when the rotation of the irradiation unit is locked, and prohibiting irradiation for animation photography when the rotation is unlocked.

Description

Technical Field

[0001] The present disclosure relates to a radiation imaging device and a control method of the radiation imaging device. Background Art

[0002] There is a known radiation imaging device having an arm having an irradiation unit for irradiating radiation at one end. Among the radiation imaging devices, there is a known radiation imaging device having an arm having two ends and being capable of supporting an image receiving unit at the other end in a posture facing the irradiation unit provided at one end (see Patent Document 1). The image receiving unit has an image receiving surface for receiving radiation transmitted through a subject and outputs a radiation image of the subject.

[0003] The radiation imaging device described in Patent Document 1 has an arm (referred to as a C-arm, etc.) whose side profile is C-shaped. This arm is positioned so as to sandwich the subject between the irradiation unit and the image receiving unit. In addition, in the radiation imaging device described in Patent Document 1, the irradiation unit is rotatably mounted on one end of the arm relative to the arm so that the irradiation direction of the irradiation unit can be changed. Thus, for example, the irradiation direction of the irradiation unit can be adjusted according to the position of the subject or the imaging part.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2005-000470

[0005] When performing animation photography (also called fluoroscopy photography, etc.) of a subject using a radiation imaging device as disclosed in Patent Document 1, radiation is continuously irradiated from an irradiation unit. However, when the radiation imaging device has such an animation photography function and a function for adjusting the irradiation direction of the irradiation unit, the following problem occurs.

[0006] That is, in the case of animation photography, radiation exposure is continuously performed for a relatively long time. Therefore, if animation photography is performed in a state where the radiation exposure opening of the irradiation unit and the image receiving surface of the image receiving unit are not opposite to each other, useless radiation that does not contribute to the animation photography is continuously irradiated. Unlike the case of still image photography in which radiation exposure is terminated in a short time, this problem is particularly expected to be improved in animation photography. Summary of the invention

[0007] An object of the technology according to the present disclosure is to provide a radiographic imaging device capable of suppressing irradiation of useless radiation that does not contribute to video imaging, and a method for controlling the radiographic imaging device.

[0008] The first embodiment of the present disclosure relates to a radiation imaging device comprising: an irradiation unit having an irradiation opening for irradiating radiation; an image receiving unit having an image receiving surface for receiving radiation irradiated from the irradiation unit and transmitted through a subject, and outputting a radiation image of the subject; an arm having the irradiation unit provided at one end and capable of supporting the image receiving unit at the other end in a posture in which the irradiation opening of the irradiation unit and the image receiving surface are opposite to each other, and capable of rotatably supporting the irradiation unit in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; a locking mechanism for locking the rotation of the irradiation unit relative to the arm in a facing posture in which the irradiation opening and the image receiving surface are opposite to each other; and a control unit capable of causing the irradiation unit to perform irradiation for animation photography in which radiation is continuously irradiated from the irradiation unit to perform animation photography of the subject, and permitting irradiation for animation photography when the rotation of the irradiation unit is locked by the locking mechanism, and prohibiting irradiation for animation photography when the rotation lock of the irradiation unit is released by the locking mechanism.

[0009] According to the above structure, the radiation imaging device includes a locking mechanism for locking the rotation of the irradiation unit relative to the arm at a position where the irradiation opening faces the image receiving surface, and a control unit for prohibiting irradiation for animation photography when the rotation lock of the irradiation unit is released. Therefore, it is possible to suppress the irradiation of useless radiation that does not contribute to animation photography.

[0010] The second embodiment of the present disclosure relates to a radiation imaging device comprising: an irradiation unit having an irradiation opening for irradiating radiation; an image receiving unit having an image receiving surface for receiving radiation irradiated from the irradiation unit and transmitted through a subject, and outputting a radiation image of the subject; an arm having the irradiation unit provided at one end and capable of supporting the image receiving unit at the other end in a posture in which the irradiation opening of the irradiation unit and the image receiving surface are opposite to each other, and capable of supporting the irradiation unit rotatably in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; a posture detection unit for detecting whether the irradiation opening is in an opposing posture relative to the image receiving surface; and a control unit capable of causing the irradiation unit to perform irradiation for animation photography in which radiation is continuously irradiated from the irradiation unit to perform animation photography of the subject, and permitting irradiation for animation photography when the posture detection unit detects that the irradiation opening is in an opposing posture, and prohibiting irradiation for animation photography when the posture detection unit does not detect that the irradiation opening is in an opposing posture.

[0011] According to the above structure, the radiation imaging device includes a posture detection unit for detecting whether the irradiation opening is in an opposing posture with respect to the image receiving surface, and a control unit for prohibiting irradiation for animation photography when the posture detection unit does not detect that the irradiation opening is in the opposing posture. Therefore, it is possible to suppress the irradiation of useless radiation that does not contribute to animation photography.

[0012] In the radiation imaging device involved in the third embodiment of the present disclosure, in the radiation imaging device involved in the first embodiment or the second embodiment, the opposing posture is a facing posture in which the central axis of the radiation beam diffused in a cone shape from the focus of the irradiation part through the irradiation opening is consistent with the normal line of the image receiving surface.

[0013] According to the above configuration, since irradiation for movie shooting is prohibited except for the facing posture, it is possible to further suppress irradiation of unnecessary radiation that does not contribute to movie shooting.

[0014] The radiation imaging device involved in the 4th mode of the present disclosure is a radiation imaging device involved in any one of the 1st to 3rd modes, in which, in a side view of the arm, the irradiation portion rotates relative to the arm in such a manner that the direction of the irradiation opening is changed in the front-to-back direction, when the direction in which the irradiation portion and the image receiving portion are provided is set to the front and the arm side is set to the rear with respect to the arm.

[0015] According to the above configuration, by rotating the direction of the irradiation opening of the irradiation section in the front-rear direction with respect to the arm, the direction of the irradiation opening can be adjusted without moving the arm.

[0016] In the radiation imaging device involved in the 5th mode of the present disclosure, in the radiation imaging device involved in any one of the 1st to 4th modes, the control unit prohibits the irradiation for animation photography, including at least one of the following controls, namely, control of prohibiting the start of irradiation for animation photography when there is a start command for animation photography; and control of stopping irradiation for animation photography during animation photography.

[0017] According to the above configuration, by prohibiting the start of irradiation for movie shooting during a non-movie shooting period or stopping irradiation for movie shooting during a movie shooting period, it is possible to suppress irradiation of unnecessary radiation that does not contribute to movie shooting.

[0018] The radiation imaging device according to the sixth aspect of the present disclosure is a radiation imaging device according to the fifth aspect, wherein the control unit has a warning unit that issues a warning in at least one of a case where the start of irradiation for animation photography is prohibited and a case where irradiation for animation photography is stopped during animation photography.

[0019] According to the above configuration, a warning is issued when the start of the movie shooting irradiation is prohibited or the movie shooting irradiation is stopped, so that the operator can be notified that the movie shooting is prohibited or the movie shooting is stopped.

[0020] In the radiation imaging device involved in the 7th mode of the present disclosure, in the radiation imaging device involved in any one of the 1st to 6th modes, the control unit can enable the irradiation unit to perform irradiation for still image photography in addition to irradiation for animation photography, and the irradiation for still image photography irradiates radiation from the irradiation unit in a shorter time than the irradiation for animation photography to perform still image photography of the subject, and the control unit allows irradiation for still image photography even when irradiation for animation photography is prohibited.

[0021] Unlike animation photography, when still image photography is performed, the irradiation direction of the irradiation unit is usually changed in various ways. For example, when the image receiving unit is detachable from the arm, the image receiving unit may be removed from the arm to perform still image photography. In this case, the irradiation direction of the irradiation unit needs to be changed according to the installation position of the image receiving unit.

[0022] Among them, according to the above configuration, even when irradiation for movie shooting is prohibited, irradiation for still image shooting is permitted, so that still image shooting can be performed by variously changing the irradiation direction of the irradiation unit, and convenience can be improved.

[0023] The radiation imaging device involved in the 8th embodiment of the present disclosure is a radiation imaging device involved in any one of the 1st to 7th embodiments, wherein the image receiving portion is configured to be loadable and removable relative to the arm, and the radiation imaging device has a loading and unloading detection portion for detecting whether the image receiving portion is removed from the arm, and regardless of whether the rotation of the irradiation portion is locked by the locking mechanism or whether the posture detection portion detects that the irradiation opening is in an opposing posture, when the image receiving portion is removed from the arm, the control portion prohibits the irradiation portion from performing animation photography irradiation.

[0024] According to the above structure, regardless of whether the rotation of the irradiation part is locked or whether the irradiation opening is in an opposing posture, irradiation for animation photography is prohibited when the image receiving part is removed from the arm, thereby further suppressing irradiation of useless radiation that does not contribute to animation photography.

[0025] The radiation imaging device involved in the 9th mode of the present disclosure is a radiation imaging device involved in any one of the 4th to 8th modes citing the 3rd mode, wherein the irradiation opening and the image receiving surface are respectively set to be rectangular, and the image receiving unit can rotate relative to the arm while maintaining a facing posture. The radiation imaging device has a rotation position detection unit, which detects the rotation position of the image receiving unit and, when the irradiation opening is projected onto the image receiving surface, detects at least four rotation positions in which the four sides of the irradiation opening and the four sides corresponding to the image receiving surface are parallel and set at 90° intervals. Regardless of whether the rotation of the irradiation unit is locked by the locking mechanism or whether the posture detection unit detects that the irradiation opening is in a facing posture, when the image receiving unit is in a rotation position other than the four rotation positions, the control unit prohibits irradiation of the irradiation unit for animation photography.

[0026] According to the above structure, regardless of whether the rotation of the irradiation part is locked or whether the irradiation opening is in a facing posture, irradiation for animation photography is prohibited when the image receiving part is in a rotation position other than the four rotation positions, thereby further suppressing the irradiation of useless radiation that does not contribute to animation photography.

[0027] In the control method of the radiation imaging device involved in the 10th embodiment of the present disclosure, the radiation imaging device comprises: an irradiation unit having an irradiation opening for irradiating radiation; an image receiving unit having an image receiving surface for receiving radiation irradiated from the irradiation unit and transmitted through a subject, and outputting a radiation image of the subject; an arm having the irradiation unit at one end and being capable of supporting the image receiving unit at the other end in a posture in which the irradiation opening of the irradiation unit and the image receiving surface are opposite to each other, and being capable of rotatably supporting the irradiation unit in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; and a control unit capable of causing the irradiation unit to perform irradiation for animation photography of the subject by continuously irradiating radiation from the irradiation unit, wherein the control unit At least one of the following controls is performed, namely, a first control, in which illumination for animation photography is permitted when the rotation of the illumination unit is locked by a locking mechanism, and illumination for animation photography is prohibited when the rotation is unlocked by the locking mechanism, wherein the locking mechanism locks the rotation of the illumination unit relative to the arm in an opposing posture in which the illumination opening and the image receiving surface are opposed to each other; and a second control, in which illumination for animation photography is permitted when the posture detection unit detects that the illumination opening is in an opposing posture, and illumination for animation photography is prohibited when the posture detection unit does not detect that the illumination opening is in an opposing posture, wherein the posture detection unit detects whether the illumination opening is in an opposing posture relative to the image receiving surface.

[0028] According to the above structure, when the rotation of the irradiation unit is locked by the locking mechanism in a facing posture where the irradiation opening and the image receiving surface are opposite, the first control allows irradiation for animation photography, and when the rotation is unlocked by the locking mechanism, the first control prohibits irradiation for animation photography.

[0029] Furthermore, when the posture detection unit detects that the irradiation opening is in the facing posture, the second control allows irradiation for animation photography, and when the posture detection unit does not detect that the irradiation opening is in the facing posture, the second control prohibits irradiation for animation photography. By the control unit performing at least one of the first control and the second control, irradiation of useless radiation that does not contribute to animation photography can be suppressed.

[0030] Effects of the Invention

[0031] According to the technology according to the present disclosure, it is possible to suppress exposure to unnecessary radiation that does not contribute to video recording. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an overall perspective view showing the radiation imaging device according to the first embodiment.

[0033] Figure 2A It is a side view of the radiation imaging device according to the first embodiment.

[0034] Figure 2B It means to make Figure 2A 1 is a side view of the radiation imaging device shown in the state where the arm is rotated in the direction of arrow M1.

[0035] Figure 2C It means to make Figure 2A 1 is a side view of the radiation imaging device shown in the state where the arm is rotated in the direction of arrow M2.

[0036] Figure 3A It is a front view of the radiation imaging device according to the first embodiment.

[0037] Figure 3B It means to make Figure 3A The illustrated radiation imaging device is a front view of a state in which the arm is rotated in the direction of arrow N1.

[0038] Figure 3C It means to make Figure 3A The illustrated diagram is a front view of the radiation imaging device in a state where the arm is rotated 180 degrees in the direction of arrow N2.

[0039] Figure 4A It is a partial side view showing the irradiation section of the radiation imaging device according to the first embodiment.

[0040] Figure 4B Yes means Figure 4A A front view of the irradiation portion in a locked released state is shown.

[0041] Figure 4C Yes means Figure 4A A front view of the locked state of the irradiation portion shown.

[0042] Figure 5 This is an overall side view showing the usage of the radiation imaging device according to the first embodiment.

[0043] Figure 6 This is a block diagram showing the functional configuration of the control unit of the radiation imaging device according to the first embodiment.

[0044] Figure 7 This is a flowchart showing the processing procedure of the control unit of the radiation imaging device according to the first embodiment.

[0045] Fig. 8A It is a partial side view showing an irradiation section of the radiation imaging device according to the second embodiment.

[0046] Figure 8B yes Fig. 8A A front view of the irradiation portion is shown.

[0047] Fig. 9A This is an overall side view showing the usage of the radiation imaging device according to the second embodiment.

[0048] Fig. 9B Yes means Fig. 9A An overall side view of a comparative example of a radiation imaging device shown.

[0049] Fig.10 This is a block diagram showing the functional structure of the control unit of the radiation imaging device according to the second embodiment.

[0050] Fig.11 It is a partial perspective view showing an image receiving section of a radiation imaging device according to a third embodiment.

[0051] Fig. 12A It is a cross-sectional view showing an example of an image receiving section of a radiation imaging device according to a third embodiment.

[0052] Fig. 12B It is a cross-sectional view showing a modified example of the image receiving section of the radiation imaging device according to the third embodiment.

[0053] Fig.13A It is a plan view showing a state where the image receiving section of the radiation imaging device according to the third embodiment is in a reference rotation position.

[0054] Fig. 13B Yes means Fig.13A The illustrated plan view shows a case where the image receiving section of the radiation imaging device is at a rotational position other than the reference rotational position.

[0055] Fig.14 This is an overall side view showing the usage of the radiation imaging device according to the third embodiment.

[0056] Fig.15 This is a block diagram showing the functional structure of a control unit of a radiation imaging device according to the third embodiment.

[0057] Fig.16 It is a partially exploded perspective view showing an image receiving section of a radiation imaging device according to a modified example.

[0058] Explanation of symbols:

[0059] 10, 50, 70-radiation imaging device, 12-arm, 14-supporting part, 16-main body, 18, 58-irradiation part, 34A, 58A-irradiation opening, 20, 60, 80-image receiving part, 20A, 60A, 80A-image receiving surface, 22A-guide rail, 22B-guide rail groove, 24-support shaft, 26-castor, 28, 68, 88-control part, 30-operation panel (an example of warning part), 31-radiation source, 32-radiation tube, 34-irradiation field limiter, 36, 92-rotation axis, 38-mounting plate, 40, 42 through hole, 44-solenoid (an example of a locking mechanism), 44A-movable iron core, 46-optical sensor, 62-posture detection unit, 82-accommodation unit, 82A, 82B-opening, 84-contact sensor (an example of a loading and unloading detection unit), 84A-terminal substrate, 84B-metal terminal, 86-contact point, 90-non-contact sensor (an example of a loading and unloading detection unit), 94-potentiometer (an example of a rotation position detection unit), 96-irradiation field, 98-optical sensor (an example of a rotation position detection unit), 100-protrusion, 102-base, 104-bolt. DETAILED DESCRIPTION

[0060] Hereinafter, the radiation imaging device according to the first to third embodiments of the present disclosure will be described in sequence with reference to the drawings. In the drawings, arrow X indicates the front-rear direction of the radiation imaging device, arrow Y indicates the width direction of the radiation imaging device, and arrow Z indicates the vertical direction.

[0061] <First Embodiment>

[0062] First, use Figure 1 to Figure 7 A radiation imaging device according to a first embodiment of the present disclosure will be described.

[0063] (Overall Structure of Radiographic Imaging Device)

[0064] Figure 1 The radiographic apparatus 10 of the present embodiment shown is an apparatus for photographing a radiographic image of a subject H. The radiographic apparatus 10 is capable of, for example, performing animation photography and still image photography of the subject H. Animation photography is performed, for example, when displaying a treatment target part of the subject H in the form of animation during surgery (also referred to as fluoroscopic photography, etc.). In animation photography, for example, an animation of the subject H is displayed on a monitor (not shown) that is provided separately from the radiographic apparatus 10. Of course, the data of the photographed animation can also be stored in the memory of the radiographic apparatus 10. Furthermore, in the case of still image photography, the photographed still image can also be displayed on the monitor or stored in the memory of the radiographic apparatus 10.

[0065] like Figure 1 As shown, the radiation imaging device 10 includes an arm 12 (referred to as a C-arm or the like) whose side shape is set to a C-shape (arc shape) and a main body 16 on which a support portion 14 is mounted. In addition, in the following, the side of the radiation imaging device 10 where the arm 12 is provided is set as the front of the radiation imaging device 10, and the side where the main body 16 is provided is set as the rear of the radiation imaging device 10.

[0066] (Arm structure)

[0067] The arm 12 has two ends. 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 unit 18 and the image receiving unit 20 in an opposing posture. A space is ensured between the irradiation unit 18 and the image receiving unit 20 so that a subject H and a bed S on which the subject H lies supinely can be inserted. Figure 1 In the direction viewed from the Y direction), the direction in which the irradiation unit 18 and the image receiving unit 20 are provided is sometimes referred to as the front of the arm 12 and the support unit 14 side is sometimes referred to as the rear of the arm 12.

[0068] And, if Figure 2A As shown, the arm 12 is configured to be rotatable relative to the main body 16 around at least two different axes M (axis parallel to the Y axis) or axis N (axis parallel to the X axis). Specifically, a guide rail 22B is formed in the support portion 14. On the other hand, a guide rail fitting portion 22A that fits with the guide rail 22B is provided on the outer peripheral surface of the arm 12. The guide rail 22B is, for example, in the shape of a groove, and is fitted with a convex guide rail fitting portion 22A. The guide rail fitting portion 22A is in the shape of an arc along the shape of the arm 12. The guide rail 22B is also in the shape of an arc having the same radius as the arc of the arm 12.

[0069] The rail fitting portion 22A formed on the arm 12 slides along the rail 22B formed on the support portion 14 , so that the arm 12 is rotatable relative to the support portion 14 and the main body portion 16 about the axis M of the arc center of the arm 12 as the rotation center.

[0070] That is, Figure 2B , Figure 2C As shown, the arm 12 is configured to move in the direction of arrow M1 ( Figure 2B in the counterclockwise direction) and the direction of arrow M2 ( Figure 2C Thus, the irradiation unit 18 and the image receiving unit 20 provided at both ends of the arm 12 can be rotated around the subject H (reference Figure 1 )'s body axis (an axis parallel to the Y axis).

[0071] Furthermore, the support portion 14 has a support shaft 24 extending in the front-rear direction of the radiation imaging device 10, and the support shaft 24 is supported by the main body 16 via a bearing (not shown). Figure 3A to Figure 3C As shown, the support portion 14 is rotatable relative to the main body 16 about the axis N of the support shaft 24 as the rotation center, and the arm 12 is also rotatable relative to the main body 16 together with the support portion 14 .

[0072] That is, Figure 3B , Figure 3C As shown, the arm 12 is configured to move around the axis N in the direction of the arrow N1 ( Figure 3B counterclockwise in the direction of arrow N2 ( Figure 3C Thus, the irradiation unit 18 and the image receiving unit 20 provided at both ends of the arm 12 can be rotated relative to the subject H (reference Figure 1 ) is reversed in the up-down direction (Z-axis direction).

[0073] in, Figure 3A The posture of the arm 12 in which the irradiation unit 18 is arranged above the image receiving unit 20 is due to the radiation tube 32 (see Figure 1 ) is located above the subject H and is called an overtube posture. Figure 3C The posture of the arm 12 in which the irradiation unit 18 is arranged below the image receiving unit 20 is referred to as a down-tube posture because the radiation tube 32 is located below the subject H.

[0074] Compared with the lower tube posture, the outer tube posture can expand the distance between the irradiation unit 18 and the subject H (refer to Figure 1) between the two sides, so that a relatively wide area can be photographed. Therefore, the outer tube posture is mainly used when photographing a still image of the subject H. On the other hand, in the lower tube posture, the radiation irradiated from the irradiation unit 18 is partially shielded by the bed S, etc., so that the radiation on the subject H (reference Figure 1 ) The radiation dose to the surgeon or operator (not shown) around the patient is reduced. Therefore, the tube-down posture is used when the subject H is continuously irradiated with radiation to take a video.

[0075] (Structure of the main body)

[0076] like Figure 1 As shown, the main body 16 of the radiation imaging device 10 has a plurality of casters 26 mounted on the lower portion thereof, and is configured to be able to travel in, for example, an operating room or a hospital ward by being pushed by an operator. That is, the radiation imaging device 10 of this embodiment is configured to be mobile.

[0077] The main body 16 includes a control unit 28 for controlling each unit of the radiation imaging device 10 such as the irradiation unit 18, and a touch panel type operation panel 30. The configuration of the control unit 28 will be described in detail later.

[0078] The operation panel 30 functions as an operation unit for operating each unit of the radiation imaging device 10 such as the irradiation unit 18 by inputting an operation command to each unit, and functions as a display unit for displaying various information such as a warning message and a radiographic image output from the image receiving unit 20. In addition, the main body 16 includes various switches (not shown) such as a power switch of the radiation imaging device 10, a power circuit and a battery for supplying power to each unit of the radiation imaging device 10, and the like.

[0079] (Structure of irradiation section)

[0080] 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 a cathode to collide with a target (anode). The position where the electrons collide with the target becomes a focus of the irradiated radiation.

[0081] Furthermore, an irradiation field limiter 34 is provided below the radiation source 31. The irradiation field limiter 34 (also referred to as a collimator, etc.) has a rectangular irradiation opening 34A. The radiation generated in the radiation tube 32 is irradiated to the subject H through the irradiation opening 34A. The irradiation field limiter 34 is capable of adjusting the opening area of ​​the irradiation opening 34A. The irradiation field limiter 34 has, for example, four shielding plates (not shown) for shielding the radiation. Each side of the four shielding plates corresponds to each side of the irradiation opening 34A and defines the irradiation opening 34A. The opening area of ​​the irradiation opening 34A is adjusted by changing the position of the shielding plate, thereby changing the irradiation field of the radiation irradiated from the irradiation unit 18.

[0082] Furthermore, the irradiation section 18 is provided so as to be able to irradiate in the width direction (in Figure 1 The axis P of the rotating shaft 36 (reference Figure 4A ) is the rotation center relative to the arm 12. Specifically, Figure 4A to Figure 4C As shown, a pair of mounting plates 38 are secured to one end of the arm 12 .

[0083] The pair of mounting plates 38 are arranged so as to sandwich both sides of the irradiation section 18 in the width direction, and are connected to both side surfaces of the irradiation section 18 in the width direction. Rotation shafts 36 are respectively provided protrudingly on the side surfaces of the irradiation section 18 that are opposite to the mounting plates 38, and the rotation shafts 36 are respectively supported on the pair of mounting plates 38 via bearings (not shown). Thus, the irradiation section 18 can rotate relative to the mounting plates 38 with the axis P of the rotation shaft 36 as the rotation center, so that the direction of the irradiation opening 34A of the irradiation section 18 can be changed in the front-rear direction of the arm 12. The irradiation direction of the radiation can be changed by changing the direction of the irradiation opening 34A.

[0084] The irradiation unit 18 is connected to the irradiation unit 18 by a cable (not shown) having a signal line for transmitting a control signal and a power line for power supply. Figure 1 The control unit 28 of the main body 16 shown and a power supply circuit (not shown) are connected.

[0085] (Structure of image receiving unit)

[0086] like Figure 1 As shown, the image receiving unit 20 is provided at a position opposite to the irradiation unit 18, i.e., at the other end of the arm 12. The image receiving unit 20 is provided with an image detector in the frame. The image receiving unit 20 is provided with an image receiving surface 20A for receiving radiation irradiated from the irradiation unit 18 and transmitted through the subject H. The radiation carrying the information of the subject H is incident on the image receiving surface 20A.

[0087] The image detector is, for example, a flat panel detector (FPD) of a digital radiography (DR) method. The FPD has a detection surface in which a plurality of pixels are arranged two-dimensionally and a thin film transistor (TFT) panel (not shown) for driving the pixels. Radiation is incident on the detection surface of the image detector through the image receiving surface 20A. The image detector converts the incident radiation into an electrical signal, and outputs a radiation image representing the subject H based on the converted electrical signal. As an image detector, for example, an indirect conversion type is used, which converts radiation into visible light through a scintillator and converts the converted visible light into an electrical signal. In addition, as an image detector, it can be a direct conversion type that converts radiation into a direct electrical signal. Furthermore, as the image receiving unit 20, it can be a structure other than the structure using the FPD, for example, it can also be a structure combining an image intensifier (II; Image Intensifier) ​​and a camera.

[0088] The image receiving unit 20 is connected to the control unit 28 of the main body 16 and a power supply circuit (not shown) through a cable (not shown) having a signal line for transmitting a control signal and a power supply line for power supply.

[0089] (Structure of the locking mechanism)

[0090] like Figure 4B and Figure 4C As shown, a through hole 40 is formed on one of the pair of mounting plates 38 that rotatably supports the irradiation unit 18, penetrating the mounting plate 38 in the thickness direction. In addition, a through hole 42 having substantially the same diameter as the through hole 40 is also formed on the side surface of the irradiation unit 18 that faces the mounting plate 38 on one side.

[0091] The irradiation portion 18 is provided with an irradiation opening 34A and an image receiving surface 20A (reference Figure 1 ) in the opposing posture, the through hole 42 of the irradiation portion 18 is formed at a position communicating with the through hole 40 of the mounting plate 38.

[0092] In this embodiment, if Figure 5 As shown, the “opposing posture” refers to a facing posture in which the central axis Q of the radiation beam that spreads in a cone shape from the focus of the irradiation unit 18 through the irradiation opening 34A coincides with the normal line Q of the image receiving surface 20A. Specifically, the focus of the irradiation unit 18 is the focus of the radiation tube 32.

[0093] And, if Figure 4A to Figure 4CAs shown, a solenoid 44 as an example of a locking mechanism for locking the rotation of the irradiation unit 18 relative to the arm 12 is mounted on the mounting plate 38 formed with the through hole 40. The solenoid 44 includes a movable iron core 44A inserted into the through hole 40 of the mounting plate 38, and is configured to be able to extend and retract the movable iron core 44A by switching the energized state and the non-energized state of the solenoid 44.

[0094] Specifically, if the solenoid 44 is energized, Figure 4B As shown, the movable iron core 44A is attracted to the solenoid 44 side and the front end of the movable iron core 44A is located in the through hole 40 of the mounting plate 38. In this state, the movable iron core 44A is not inserted into the through hole 42 of the irradiation part 18, so the irradiation part 18 is released from the locking state so that it can rotate relative to the mounting plate 38, that is, the arm 12.

[0095] On the other hand, when the through hole 40 of the mounting plate 38 is in communication with the through hole 42 of the irradiation portion 18, that is, when the irradiation opening 34A is in an opposed posture, Figure 4C As shown in FIG. 1 , the movable iron core 44A can be inserted into the through hole 42 of the irradiation portion 18. Therefore, if the energization to the solenoid 44 is cut off in a state where the irradiation opening 34A is in an opposing posture, as shown in FIG. Figure 4C As shown, the front end of the movable iron core 44A is inserted into the through hole 42 and reaches the irradiation part 18. In this state, the movable iron core 44A of the solenoid 44 is also inserted into the through hole 42 of the irradiation part 18, so that the irradiation part 18 is locked with respect to the mounting plate 38, that is, the arm 12, and the rotation is restricted.

[0096] Furthermore, a light sensor 46 is provided outside the through hole 42 in the irradiation section 18. The light sensor 46 is, for example, a reflective sensor in which a light emitting window for emitting light by a light emitting element (not shown) and a light receiving window for receiving light by a light receiving element are arranged on the same surface. For example, in the light sensor 46, when the movable iron core 44A is located in front of the light emitting window and the light receiving window, the light emitted from the light emitting window is reflected by the movable iron core 44A, thereby increasing the amount of light received through the light receiving window. On the other hand, when the movable iron core 44A is retracted from the front of the light emitting window and the light receiving window, the light is not reflected by the movable iron core 44A, thereby decreasing the amount of light received through the light receiving window. In this way, the light sensor 46 can detect the presence or absence of the movable iron core 44A inserted into the through hole 42 of the irradiation section 18 by detecting the change in the light emitted from the light emitting window and received by the light receiving element. The optical sensor 46 outputs an on signal as a detection signal to the control unit 28 when the movable iron core 44A is detected, and outputs an off signal as a detection signal to the control unit 28 when the movable iron core 44A is not detected.

[0097] (Structure of control unit)

[0098] like Figure 6 As shown, the radiation imaging device 10 is provided in the main body 16 (reference Figure 1 ) sends a control signal to the radiation tube 32 of the irradiation unit 18 to control the tube voltage, tube current, and irradiation time of the radiation tube 32. The energy of the radiation is controlled by controlling the tube voltage, and the dose of the radiation is controlled by controlling the tube current and irradiation time. In practice, a high voltage is applied to the radiation tube 32, so the control unit 28 controls the radiation tube 32 through a high voltage generating device not shown. When performing photography, photography conditions including the tube voltage, tube current, and irradiation time are set through the operation panel 30. The control unit 28 operates the irradiation unit 18 according to the set photography conditions.

[0099] The control unit 28 can make the irradiation unit 18 perform irradiation for movie photography by continuously irradiating radiation from the irradiation unit 18 to perform the irradiation for movie photography. Figure 1 ) Animation photography of the image. The term "continuous irradiation with radiation" includes not only continuous irradiation with radiation but also so-called pulse irradiation in which irradiation is repeated at small predetermined time intervals.

[0100] When performing animation photography, the control unit 28 causes the image detector of the image receiving unit 20 to operate synchronously with the animation photography irradiation of the irradiation unit 18. When performing animation photography, the irradiation time is basically not set as a photography condition, and the start and end commands of the animation photography are issued through the operation panel 30. When the command to start the animation photography is input, the control unit 28 starts irradiating radiation from the irradiation unit 18 under the preset photography conditions. Of course, the start and end commands of the animation photography can also be issued by a foot switch other than the operation panel 30.

[0101] In the animation photography, when the animation photography is irradiated, the image detector repeatedly performs image detection at a preset frame rate. The image output by the image detector is sent to the control unit 28. The control unit 28 sequentially outputs the received images to a monitor (not shown). Thus, the animation of the subject H is displayed on the monitor.

[0102] Furthermore, the control unit 28 can control the subject H (reference number) by causing the irradiation unit 18 to perform irradiation for still image photography in a shorter time than irradiation for moving image photography. Figure 1 ) still image photography.

[0103] In still image photography, the control unit 28 causes the image detector of the image receiving unit 20 to operate synchronously with the irradiation timing of the still image photography irradiation of the irradiation unit 18. For example, a command for still image photography is issued through an irradiation switch (not shown) connected to the control unit 28. In the case of still image photography, the irradiation time is, for example, a time amount ranging from tens of milliseconds to hundreds of milliseconds. If a command for still image photography is input, the control unit 28 operates the irradiation unit 18 according to the pre-set photography conditions. In the case of still image photography, the irradiation time is set in the photography conditions, so the irradiation of the irradiation unit 18 ends when the set irradiation time has passed.

[0104] When the irradiation is finished, the image detector starts to output the detected image. The image output by the image detector is sent to the control unit 28. The control unit 28 stores the data of the still image in a memory not shown in the figure. And, the stored still image is displayed on a monitor not shown in the figure. Thus, a still image of the subject H is displayed on the monitor. And, in order to confirm the photographed still image immediately after shooting, the still image can be displayed on the operation panel 30.

[0105] Then, the control unit 28 controls the solenoid 44. In a state where the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44, the irradiation unit 18 is turned on and off via the operation panel 30 (see Figure 1 ) When the lock release command is input, the control unit 28 sends a drive signal to the solenoid 44, and energizes the solenoid 44. As a result, the movable iron core 44A is attracted by the solenoid 44, and the lock of the irradiation unit 18 is released.

[0106] On the other hand, when the operation panel 30 (reference Figure 1 ) inputs a lock command, the control unit 28 cuts off the power to the solenoid 44. In this case, when the irradiation opening 34A is in the opposing posture, the through hole 40 of the mounting plate 38 is connected to the through hole 42 of the irradiation unit 18, so that the irradiation unit 18 is locked by inserting the movable iron core 44A into the through hole 42 of the irradiation unit 18.

[0107] In addition, even when the lock command is input, when the irradiation opening 34A is not in the facing position, that is, when the through hole 40 of the mounting plate 38 and the through hole 42 of the irradiation unit 18 are not connected, the movable iron core 44A cannot be inserted into the through hole 42, so the irradiation unit 18 is not locked. In this way, the control unit 28 switches the locked state and the unlocked state of the irradiation unit 18 by controlling the energization of the solenoid 44.

[0108] Furthermore, the control unit 28 determines whether the rotation of the irradiation unit 18 is locked based on the detection signal from the optical sensor 46 provided in the irradiation unit 18. When the movable iron core 44A is in the through hole 42 of the irradiation unit 18, the control unit 28 receives an on signal from the optical sensor 46 as a detection signal. When the control unit 28 receives the on signal from the optical sensor 46, it determines that the rotation of the irradiation unit 18 is locked. On the other hand, when the movable iron core 44A is not in the through hole 42 of the irradiation unit 18, the control unit 28 receives an off signal from the optical sensor 46 as a detection signal. When the control unit 28 receives the off signal from the optical sensor 46, it determines that the rotation of the irradiation unit 18 is not locked.

[0109] (Control method of radiation imaging device)

[0110] Next, use Figure 7 A control method of the radiation imaging device 10 according to the present embodiment will be described with reference to the flowchart of FIG.

[0111] First, in step S200, when the power of the radiation imaging device 10 is turned on by operating a power switch (not shown) ("Yes" in step S200), the control unit 28 starts controlling the radiation imaging device 10. When the control by the control unit 28 starts, input of imaging conditions and the like can be received through the operation panel 30. Then, the control unit 28 waits for an instruction for video imaging or still image imaging.

[0112] In step S202, the control unit 28 waits for an instruction for animation photography from the operator. If there is no instruction for animation photography ("No" in step S202), the process proceeds to step S203 and waits for an instruction for still image photography. In step S203, if there is no instruction for still image photography ("No" in step S203), the process returns to step S202. In step S203, if there is an instruction for still image photography, the control unit 28 executes still image photography (step S204). When still image photography is finished, the process returns to step S202.

[0113] In step S202 , when there is a command for movie shooting via the operation panel 30 (“YES” in step S202 ), the process proceeds to step S205 .

[0114] In step S205, the control unit 28 first performs a start permission condition determination process for animation photography. In the start permission condition determination process, the control unit 28 determines whether the start permission condition is satisfied (step S206). In this embodiment, the situation that the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44 is set as the "start permission condition" for animation photography.

[0115] When it is determined that the start permission condition is satisfied, that is, the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44 (YES in step S206 ), the control unit 28 sends a control signal to the radiation tube 32 to start movie imaging (step S208 ).

[0116] On the other hand, if it is determined that the start permission condition for animation photography is not satisfied, that is, the rotation of the irradiation unit 18 relative to the arm 12 is not locked by the solenoid 44 ("No" in step S206), the control unit 28 does not permit animation photography (step S210) and issues a warning (step S212). Then, the process returns to step S202.

[0117] The warning is notified by, for example, displaying a warning message indicating that the video recording cannot be started on the operation panel 30 as the warning unit. Alternatively, the warning may be notified by sounding a warning sound through a speaker (not shown) or lighting a lamp (not shown).

[0118] In step S208, after starting the animation photography, the control unit 28 determines whether there is an instruction from the operator to end the animation photography via the operation panel 30 (step S214). If there is an instruction, the control unit 28 sends a control signal to the radiation tube 32 of the irradiation unit 18 to stop the radiation irradiation (step S216). Then, the process moves to step S228.

[0119] In step S214, if there is no instruction to end the animation photography, the control unit 28 performs the animation photography continuation permission condition determination process (step S218). In the continuation permission condition determination process, the control unit 28 determines whether the continuation permission condition is satisfied (step S220). In this embodiment, similar to the "start permission condition", the situation that the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44 is set as the "continuation permission condition".

[0120] If it is determined that the continuation permission condition is satisfied, that is, the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44 (YES in step S220 ), the video recording is continued (step S222 ). Thereafter, the process returns to step S214 .

[0121] On the other hand, if it is determined that the continuation permission condition is not satisfied, that is, the rotation of the irradiation unit 18 relative to the arm 12 is not locked by the solenoid 44 ("No" in step S220), the animation shooting is stopped (step S224) and a warning is notified (step S226). Thereafter, the process moves to step S228. In addition, similar to the warning in step S212, the warning is notified by, for example, displaying a warning message indicating that the animation shooting cannot be started on the operation panel 30 as the warning unit.

[0122] In step S228, the control unit 28 determines whether the power of the radiographic device 10 has been turned off by the operator operating a power switch (not shown). If the power of the radiographic device 10 has not been turned off ("No" in step S228), the process returns to step S202. On the other hand, if the power of the radiographic device 10 has been turned off ("Yes" in step S228), the control unit 28 ends the control of the radiographic device 10.

[0123] In addition, as shown in step S203 and step S204, in still image shooting, unlike in animation shooting, when there is a still image shooting command from the operator, the control unit 28 executes still image shooting unless animation shooting is performed. That is, the control unit 28 permits still image shooting without performing the animation shooting start permission condition determination process and the continuation permission condition determination process as in animation shooting. This is equivalent to the control unit 28 permitting the still image shooting by the irradiation unit 18 even when the irradiation for animation shooting by the irradiation unit 18 is prohibited.

[0124] (Effect)

[0125] If radiation is irradiated from the irradiation unit 18 in a state where the irradiation opening 34A of the irradiation unit 18 and the image receiving surface 20A of the image receiving unit 20 are not opposed to each other, there is a possibility that the irradiation field of the radiation is offset from the image receiving surface 20A. In particular, when performing video photography, the irradiation of radiation is continued for a long time, so if the irradiation field of the radiation is offset from the image receiving surface 20A, useless radiation that does not contribute to the video photography is continuously irradiated.

[0126] Among them, according to the radiation imaging device 10 of the present embodiment, the solenoid 44 is provided for locking the rotation of the irradiation section 18 relative to the arm 12 in the facing posture in which the irradiation opening 34A and the image receiving surface 20A of the image receiving section 20 face each other.

[0127] Furthermore, the control unit 28 performs control to allow irradiation for animation photography (equivalent to the first control) in a state where the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44. Therefore, in the facing posture where the irradiation opening 34A of the irradiation unit 18 and the image receiving surface 20A of the image receiving unit 20 face each other, animation photography can be performed.

[0128] On the other hand, when the rotation of the irradiation unit 18 is not locked by the solenoid 44, the irradiation opening 34A may be offset from the opposing posture. According to the radiation imaging device 10 of the present embodiment, when the irradiation unit 18 is unlocked, the control unit 28 performs control to prohibit irradiation for animation photography (equivalent to the first control). Therefore, it is possible to suppress the irradiation of radiation in a state where the irradiation field of the radiation is offset from the image receiving surface 20A. Thus, it is possible to suppress the irradiation of useless radiation that does not contribute to animation photography. By suppressing the irradiation of such useless radiation, it is also possible to suppress the useless radiation of the radiation imaging device 10 to medical personnel such as operators.

[0129] For example, the irradiation amount of radiation relative to the irradiation field of the image receiving surface 20A is regulated by the JIS standard (JIS-Z-4751-2-54: 2017). In this embodiment, since it is possible to suppress irradiation with the irradiation field of the radiation shifting from the image receiving surface 20A, it is also easy to comply with the standard.

[0130] In addition, the control of the control unit 28 for prohibiting the irradiation for animation photography includes the following control, that is, control for prohibiting the start of the irradiation for animation photography when there is a command to start the animation photography, and control for stopping the irradiation for animation photography during the animation photography. In this way, by prohibiting the start of the irradiation for animation photography when the animation photography has not started and stopping the irradiation for animation photography during the animation photography, it is possible to suppress the irradiation of useless radiation that does not contribute to the animation photography.

[0131] In particular, according to the present embodiment, in the facing posture in which the central axis Q of the beam of radiation diffused in a cone shape from the focus of the irradiation unit 18 through the irradiation opening 34A coincides with the normal line Q of the image receiving surface 20A, the solenoid 44 locks the rotation of the irradiation unit 18 relative to the arm 12. Thus, irradiation for animation photography is prohibited except in the facing posture, so that irradiation of useless radiation that does not contribute to animation photography can be further suppressed.

[0132] Furthermore, according to the present embodiment, the irradiation unit 18 is configured to be rotatable relative to the arm 12 in such a manner that the orientation of the irradiation opening 34A can be changed in the front-to-back direction of the arm 12. In this way, by rotating the orientation of the irradiation opening 34A of the irradiation unit 18 relative to the arm 12 in the front-to-back direction of the arm 12, the orientation of the irradiation opening 34A can be adjusted without moving the arm 12. Being able to adjust the orientation of the irradiation opening 34A according to the photographing part of the subject H is more convenient in still image photography. On the other hand, in a case where the irradiation opening 34A is not opposite to the image receiving surface 20A, as described above, it is necessary to prohibit animation photography in order to suppress the irradiation of useless radiation. According to the present embodiment, both the convenience of still image photography and the suppression of the irradiation of useless radiation in animation photography can be met. In this way, the technology involved in the present disclosure is particularly effective in the case of a mechanism for adjusting the orientation of the irradiation opening 34A in consideration of the convenience of still image photography.

[0133] Furthermore, according to the present embodiment, when the start of the irradiation for animation photography is prohibited or when the irradiation for animation photography is stopped during the animation photography, the control unit 28 notifies a warning through the operation panel 30 as a warning unit. Therefore, it is possible to notify the operator that the animation photography is prohibited or that the animation photography is stopped.

[0134] Furthermore, the radiation imaging device 10 of the present embodiment is configured to enable the irradiation unit 18 to perform irradiation for still image photography in addition to irradiation for animation photography. Unlike animation photography, in the case of still image photography, the irradiation direction of the irradiation unit 18 is generally changed in various ways for use. However, according to the present embodiment, the control unit 28 allows irradiation for still image photography even when irradiation for animation photography is prohibited, so that still image photography can be performed by changing the irradiation direction of the irradiation unit 18 in various ways, and convenience can be improved.

[0135] In the above example, the central axis Q of the radiation beam (reference Figure 5 ) is described as an example of a facing posture in which the center axis Q and the normal to the image receiving surface 20A are consistent, but the facing posture also includes, for example, the following situation, that is, due to assembly errors and individual differences during manufacturing, the center axis Q and the normal to the image receiving surface 20A are offset within the tolerance range. And, the opposing posture also includes the following situation, that is, not only the facing posture, but also as long as the irradiation field of the radiation based on the irradiation unit 18 is within the range included in the image receiving surface 20A, the center axis Q and the normal to the image receiving surface 20A are offset beyond the tolerance. Of course, as long as animation photography is allowed only in the facing posture and prohibited in other postures, it is most preferred from the viewpoint of suppressing useless irradiation.

[0136] <Second Embodiment>

[0137] Next, use Figure 8~ Fig.10 A radiation imaging device according to a second embodiment of the present disclosure will be described. The same components as those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted, and description will be mainly focused on the differences.

[0138] The radiation imaging device 10 of the first embodiment includes a solenoid 44 as a locking mechanism for locking the rotation of the irradiation unit 18 and a photosensor 46 for detecting a locked state. Fig. 9A As shown, the radiation imaging device 50 of the present embodiment includes a posture detection section 62 that detects whether or not the irradiation opening 58A of the irradiation section 58 is in an opposing posture opposing the image receiving surface 60A of the image receiving section 60 .

[0139] like Fig. 8A and Figure 8B As shown, the posture detector 62 is, for example, a rotary potentiometer mounted on the rotating shaft 36 of the irradiation unit 58. The posture detector 62 includes a resistor (not shown) and a slider (not shown) that slides on the surface of the resistor as the rotating shaft 36 rotates, and the resistance value changes according to the rotation angle of the rotating shaft 36. Therefore, the posture detector 62 can detect the rotation angle of the rotating shaft 36 relative to the mounting plate 38 by detecting the resistance value.

[0140] For example, Fig. 9A As shown, the rotation angle of the rotation axis 36 relative to the mounting plate 38 (arm 12) when the irradiation opening 58A is set to an opposing posture (facing posture) relative to the image receiving surface 60A is set as a reference angle. In this case, the rotation angle of the rotation axis 36 relative to the reference angle is detected by the posture detection unit 62, so that it is possible to detect whether the irradiation opening 58A is in the opposing posture.

[0141] like Fig.10 As shown, the detection signal from the posture detection unit 62 is sent to the main body (reference Fig. 9A ) on the control unit 68. For example, Fig. 9A As shown, in the posture where the irradiation opening 58A of the irradiation unit 58 and the image receiving surface 60A of the image receiving unit 60 are facing each other, the posture detection unit 62 detects that the rotation axis 36 is at the reference angle. In this case, the posture detection unit 62 outputs a signal corresponding to the reference angle as a detection signal to the control unit 68 when detecting that the rotation axis 36 is at the reference angle, that is, the irradiation opening 58A is in the posture facing the image receiving surface 60A. When receiving the detection signal corresponding to the reference angle, the control unit 68 determines that the irradiation opening 58A is in the facing posture.

[0142] On the other hand, Fig. 9B As shown, in the posture where the irradiation opening 58A of the irradiation unit 58 and the image receiving surface 60A of the image receiving unit 60 are not in opposition, the posture detection unit 62 detects that the rotation axis 36 is not at the reference angle. In this case, the posture detection unit 62 outputs a signal corresponding to an angle other than the reference angle as a detection signal to the control unit 68 when detecting that the rotation axis 36 is not at the reference angle, that is, the irradiation opening 58A is not in the posture opposite to the image receiving surface 60A. When the control unit 68 receives the detection signal corresponding to the angle other than the reference angle, it determines that the irradiation opening 58A is not in the opposing posture.

[0143] The control flow of the control unit 68 of this embodiment is executed in the same steps as the control flow of the control unit 28 of the first embodiment. In the control flow of the first embodiment, the "start permission condition" of the animation photography in step S205 and the "continuation permission condition" of the animation photography in step S218 are set to the case where the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44.

[0144] In contrast, in this embodiment, the detection of the irradiation opening 58A in the facing position by the posture detection unit 62 becomes the "start permission condition" and the "continue permission condition". When the control unit 68 determines that the irradiation opening 58A is in the facing position, it permits the irradiation for animation photography (or continues), and when it determines that the irradiation opening 58A is not in the facing position, it prohibits the irradiation for animation photography (or stops).

[0145] (Effect)

[0146] According to the radiation imaging device 50 of the present embodiment, the posture detection unit 62 is provided, which can detect whether the irradiation opening 58A is in the facing posture by detecting the rotation angle of the rotation shaft 36 of the irradiation unit 58 .

[0147] Furthermore, when the posture detection unit 62 detects that the irradiation opening 58A is in the facing posture, that is, the rotation angle of the rotation shaft 36 is set to the reference angle, the control unit 68 performs control to allow irradiation for movie shooting (equivalent to the second control). Therefore, in the facing posture in which the irradiation opening 58A of the irradiation unit 58 and the image receiving surface 60A of the image receiving unit 60 are reliably facing each other, movie shooting can be performed.

[0148] On the other hand, when the posture detection unit 62 does not detect that the irradiation opening 58A is in the facing posture, that is, when the rotation angle of the rotation shaft 36 is deviated from the reference angle, the control unit 68 performs control to prohibit irradiation for video recording (equivalent to the second control). Therefore, it is possible to suppress irradiation of radiation in a state where the irradiation field of the radiation is deviated from the image receiving surface 60A, thereby suppressing irradiation of useless radiation that does not contribute to video recording.

[0149] <Third Embodiment>

[0150] Next, use Figure 11 to Figure 15 A radiation imaging device according to a third embodiment of the present disclosure will be described. Note that illustration and description of the same configuration as that of the first embodiment will be omitted, and the description will focus on the differences.

[0151] In the radiation imaging device 10 of the first embodiment, the image receiving unit 20 is fixed to the other end of the arm 12. In contrast, in the radiation imaging device 70 of the present embodiment, Fig.14 As shown, the image receiving unit 80 is provided to be attachable to and detachable from the arm 12 .

[0152] Specifically, if Fig.11 As shown in FIG. 1 , a receiving portion 82 for receiving the image receiving portion 80 is provided at the other end of the arm 12. The receiving portion 82 is a flat rectangular box, and an opening 82A for receiving the image receiving portion 80 in the receiving portion 82 is formed on one of the four side surfaces. Fig.14 ) A square opening 82B is also formed on the upper surface of the receiving portion 82 opposite thereto.

[0153] Similar to the first embodiment, the image receiving unit 80 has an image detector such as a flat panel detector built into the frame. In this embodiment, the image receiving unit 80 is configured to be movable and detachably accommodated in the accommodating unit 82. Such a movable image receiving unit 80 is called an electronic cassette or the like.

[0154] The mobile image receiving unit 80 includes, for example, a battery and a wireless communication unit (not shown), and is configured to communicate with a control unit 88 (see FIG. Fig.14 ) and other wireless communications. When the wireless communication unit is used, the image receiving unit 80 is driven by power from a battery and can be used without cables. Fig.14 As shown, the image receiving section 80 is provided so as to be usable in a state of being detached from the housing section 82 (arm 12 ).

[0155] On the other hand, when the image receiving unit 80 is installed in the receiving unit 82, Fig. 12AAs shown, the image receiving surface 80A of the image receiving unit 80 is exposed from the opening 82B formed on the upper surface of the receiving unit 82. Thus, even when the image receiving unit 80 is installed in the receiving unit 82, the image receiving surface 80A of the image receiving unit 80 can receive the image from the irradiation unit 18 (see Fig.14 ) irradiated with radiation.

[0156] Furthermore, the housing portion 82 is provided with a contact sensor 84 as an example of a mounting and dismounting detection portion for detecting whether the image receiving portion 80 is dismounted from the housing portion 82. In the present embodiment, the contact sensor 84 is composed of a terminal substrate 84A and a metal terminal 84B provided upright on the terminal substrate 84A. The terminal substrate 84A and the metal terminal 84B are provided on the side surface of the housing portion 82 opposite to the side surface where the opening 82A is formed.

[0157] On the other hand, a contact 86 for contacting the metal terminal 84B is provided at the lower end of the image receiving unit 80, and when the image receiving unit 80 is received in the receiving unit 82 from the opening 82A, the contact 86 of the image receiving unit 80 contacts the metal terminal 84B of the receiving unit 82. By detecting the change in electrostatic capacitance at this time as an electrical signal, it is possible to detect whether the image receiving unit 80 is received in the receiving unit 82, that is, whether the image receiving unit 80 is mounted on the arm 12.

[0158] In addition, the attachment and detachment detection unit is not limited to the contact sensor 84 as long as it has a function of detecting whether the image receiving unit 80 is detached from the receiving unit 82. Fig. 12B As shown, a non-contact sensor 90 may be used as the attachment and detachment detection unit.

[0159] Fig. 12B The non-contact sensor 90 shown is, for example, the same as the optical sensor 46 of the first embodiment. The non-contact sensor 90 can detect the presence or absence of the image receiving section 80 in the storage section 82 by detecting a change in the amount of light emitted from the light emitting element and received by the light receiving element. In addition, a micro switch or the like can also be used as the attachment and detachment detection section.

[0160] In addition, although omitted from the illustration, in addition to the contact sensor 84 or the non-contact sensor 90 serving as a loading and unloading detection portion, the housing portion 82 is provided with a locking mechanism and a lock release mechanism for fixing the image receiving portion 80 in the housing portion 82 to prevent the image receiving portion 80 from falling off and for releasing the fixation.

[0161] And, if Fig. 12AAs shown, a rotation shaft 92 extending in the vertical direction is protrudingly provided on the lower surface of the receiving portion 82, and the rotation shaft 92 is supported on a bearing (not shown) provided at the other end of the arm 12. Thus, the receiving portion 82 and the image receiving portion 80 installed in the receiving portion 82 can rotate relative to the arm 12 around the axis R of the rotation shaft 92 while maintaining a facing posture.

[0162] Furthermore, a potentiometer 94 as an example of a rotation position detection unit for detecting the rotation position of the image receiving unit 80 is mounted on the rotation shaft 92. The potentiometer 94 includes a resistor (not shown) and a slider (not shown) that slides on the surface of the resistor as the rotation shaft 92 rotates, and can detect the rotation angle of the rotation shaft 92 relative to the arm 12 by detecting the resistance value.

[0163] For example, Fig.13A As shown, the four sides of the radiation irradiation field 96 are rotated to be parallel to the four sides of the image receiving surface 80A, that is, the irradiation opening 34A (reference Fig.14 ) is projected onto the image receiving surface 80A, the rotation position where the four sides of the irradiation opening 34A and the four sides corresponding to the image receiving surface 80A are parallel is set as the reference rotation position. And, the rotation axis 92 (reference Fig. 12A ) is set as the reference angle.

[0164] When the image receiving unit 80 is in the reference rotation position, the radiation irradiation field 96 does not protrude from the image receiving surface 80A but is contained in the image receiving surface 80A. In addition, when the rotation axis 92 rotates at 90° intervals (90°, 180°, 270°) relative to the reference angle, the image receiving unit 80 is also in the reference rotation position.

[0165] On the other hand, Fig. 13B As shown, on the rotating shaft 92 (reference Fig. 12A ) When the rotation angle relative to the reference angle is other than 90° intervals, the four sides of the radiation irradiation field 96 are not parallel to the four sides corresponding to the image receiving surface 80A, and therefore the radiation irradiation field 96 tends to protrude relative to the image receiving surface 80A.

[0166] That is, through Fig. 12A The potentiometer 94 shown is used to detect the rotation angle of the rotation shaft 92 relative to the reference angle, thereby being able to detect whether the image receiving portion 80 is in the reference rotation position.

[0167] In addition, when the image receiving surface 80A of the image receiving unit 80 is set to a rectangular shape, the rotation position where the four sides of the radiation irradiation field 96 are parallel to the four sides corresponding to the image receiving surface 80A is the reference rotation position. When the image receiving surface 80A is a rectangular shape, the width of the image receiving surface 80A changes when it is rotated 90° relative to the reference angle. In this case, the irradiation field limiter 34 (refer to Fig.14 ) to adjust the radiation irradiation field 96.

[0168] In addition, the rotation position detection unit is not limited to the potentiometer 94 as long as it has a function of detecting the rotation position of the storage unit 82 (and the image receiving unit 80) relative to the arm 12. Fig. 12B As shown, a photosensor 98 may be used as the rotational position detection unit.

[0169] When the optical sensor 98 is used as the rotation position detection unit, for example, a plurality of protrusions 100 protruding radially outward from the rotation shaft 92 are provided at intervals of 90 degrees on the outer peripheral surface of the rotation shaft 92. The optical sensor 98 detects the presence or absence of the protrusions 100, thereby detecting whether the receiving portion 82 (and the image receiving portion 80) is in the reference rotation position.

[0170] like Fig.15 As shown, the control unit 88 receives detection signals from the contact sensor 84 and the potentiometer 94, and determines whether the image receiving unit 80 is detached from the arm 12 and whether the rotation position of the image receiving unit 80 is at the reference rotation position.

[0171] Furthermore, when the control unit 88 determines that the image receiving unit 80 is detached from the arm 12 or is in a rotational position other than the reference rotational position, the control unit 88 sends a control signal to the radiation tube 32 of the irradiation unit 18 to prohibit irradiation for animation photography.

[0172] The control flow of the control unit 88 of this embodiment is executed in the same steps as the control flow of the control unit 28 of the first embodiment. In the control flow of the first embodiment, the "start permission condition" of the animation photography in step S205 and the "continuation permission condition" of the animation photography in step S218 are set to the case where the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44.

[0173] In this embodiment, except for the case where the rotation of the irradiation unit 18 relative to the arm 12 is locked by the solenoid 44, the case where the image receiving unit 80 is installed on the arm 12 and the case where the image receiving unit 80 is in the reference rotation position become the "start permission condition" and the "continue permission condition".

[0174] That is, regardless of whether the rotation of the irradiation unit 18 is locked by the solenoid 44, the control unit 88 prohibits (or stops) irradiation for animation photography when it is determined that the image receiving unit 80 is detached from the arm 12 or when it is determined that the image receiving unit 80 is in a rotation position other than the reference rotation position.

[0175] In addition, in the control flow, when there is a still image shooting command from the operator, the control unit 88 allows still image shooting even if the animation shooting is prohibited or stopped. Fig.14 As shown, even in a state where the image receiving unit 80 is detached from the arm 12, still image photography can be performed.

[0176] (Effect)

[0177] According to the radiation imaging device 70 of this embodiment, the image receiving section 80 is detachable from the housing section 82 fixed to the arm 12 , and includes a contact sensor 84 for detecting whether the image receiving section 80 is detached from the housing section 82 .

[0178] Furthermore, when the contact sensor 84 detects that the image receiving unit 80 is removed from the storage unit 82, the control unit 88 prohibits the irradiation for animation photography by the irradiation unit 18. Thus, it is possible to prevent the irradiation of radiation from the irradiation unit 18 when the image receiving unit 80 is removed from the arm 12, thereby suppressing the irradiation of useless radiation that does not contribute to animation photography.

[0179] Furthermore, according to the radiation imaging device 70 of the present embodiment, the image receiving unit 80 is rotatable relative to the arm 12 while maintaining the facing posture, and includes a potentiometer 94 for detecting whether the image receiving unit 80 is in the reference rotation position.

[0180] Furthermore, when the image receiving unit 80 is in a rotational position other than the reference rotational position, the control unit 88 prohibits the irradiation for animation by the irradiation unit 18. Thus, it is possible to prevent the irradiation of radiation from the irradiation unit 18 in a state where the four sides of the irradiation field 96 of the radiation are not parallel to the four sides corresponding to the image receiving surface 80A, thereby suppressing the irradiation of useless radiation that does not contribute to animation.

[0181] Furthermore, according to the present embodiment, the control unit 88 permits still image photography even when video photography is prohibited. Therefore, still image photography is possible even when the image receiving unit 80 is removed from the arm 12, thereby improving convenience.

[0182] <Other Implementation Methods>

[0183] An example of an embodiment of the present disclosure has been described above, but the present disclosure is not limited to the above embodiment, and can be implemented in various forms within the scope of the present disclosure. Furthermore, the structures of the above embodiments can be appropriately combined.

[0184] For example, the irradiation unit 18 of the third embodiment is configured to have the same structure as the irradiation unit 18 of the first embodiment and is provided with a solenoid 44 as a locking mechanism. However, the irradiation unit 18 of the third embodiment may be configured to have the same structure as the irradiation unit 58 of the second embodiment and be provided with a posture detection unit 62.

[0185] In this case, in the third embodiment, regardless of whether the posture detection unit 62 detects that the irradiation opening 34A is in an opposing posture (or a facing posture), the control unit 88 prohibits irradiation for animation photography when it is determined that the image receiving unit 80 is detached from the arm 12 and when it is determined that the image receiving unit 80 is in a rotation position other than the reference rotation position.

[0186] Furthermore, in the third embodiment, the image receiving unit 80 is detachable from the arm 12 and rotatable, but the image receiving unit 80 may be only detachable from the arm 12 and only rotatable.

[0187] That is, the image receiving unit 80 may be detachably mounted in the storage unit 82 fixed to the arm 12 in a non-rotatable manner. In this case, regardless of whether the rotation of the irradiation unit 18 is locked or whether the irradiation opening 34A is in the facing position, when the image receiving unit 80 is removed from the arm 12, the control unit 88 prohibits the irradiation unit 18 from irradiating for animation photography.

[0188] Furthermore, the image receiving unit 80 may be non-detachably fixed to the housing 82 rotatably supported on the arm 12. In this case, regardless of whether the rotation of the irradiation unit 18 is locked or whether the irradiation opening 34A is in the facing position, the control unit 88 prohibits the irradiation unit 18 from irradiating for animation photography when the image receiving unit 80 is in a rotation position other than the reference rotation position.

[0189] Furthermore, in the third embodiment, the image receiving unit 80 is accommodated in the accommodating portion 82 provided at the other end of the arm 12, so that the image receiving unit 80 is detachable from the arm 12. However, the method of attaching and detaching the image receiving unit 80 to the arm 12 is not limited to the structure of the third embodiment.

[0190] For example, Fig.16As shown, the following structure can be set, that is, a base 102 is erected at the other end of the arm 12, and the image receiving unit 80 is fixed to the base 102 by a plurality of bolts 104, so that the image receiving unit 80 can be detachably mounted on the arm 12. In addition, in this case, it is necessary to form a plurality of internal threaded holes (not shown) on the lower surface of the image receiving unit 80.

[0191] Furthermore, in the first embodiment, the solenoid 44 is used as the lock mechanism, but the lock mechanism is not limited to the solenoid 44 as long as it has a function of restricting the rotation of the irradiation unit 18 relative to the arm 12 and releasing the restriction.

[0192] Furthermore, in the above-mentioned embodiments, a C-arm having a C-shaped side surface is described as an example of the arm 12, but a U-arm having a U-shaped side surface may also be used. The U-arm can also hold the irradiation unit 18 and the image receiving unit 20 in an opposing posture, similar to the C-arm.

[0193] Furthermore, although X-rays are used as an example in the above description as radiation, the radiation is not limited to X-rays and may be gamma rays or the like.

[0194] In each of the above-mentioned embodiments, various processors (Processor) as shown below can be used as the hardware structure of the processing unit (Processing Unit) that performs various processes such as the control unit 28. Among the various processors, as described above, in addition to the general-purpose processor that executes software to function as various processing units, namely CPU, there are also processors such as FPGA (Field Programmable Gate Array) that can change the circuit structure after manufacturing, namely programmable logic devices (Programmable Logic Device: PLD) and ASIC (Application Specific Integrated Circuit) that have a circuit structure specially designed for performing specific processing, namely dedicated circuits, etc.

[0195] One processing unit may be composed of one of these various processors, or a combination of two or more processors of the same or different types (for example, a combination of multiple FPGAs and / or a combination of a CPU and an FPGA). Furthermore, multiple processing units may be composed of one processor.

[0196] As an example of a plurality of processing units constituted by one processor, the first method is to constitute one processor by a combination of one or more CPUs and software, and the processor functions as a plurality of processing units. The second method is to use a processor that realizes the functions of the entire system including a plurality of processing units by one IC (Integrated Circuit) chip, as represented by a system on chip (SoC). In this way, one or more of the above-mentioned various processors are used as a hardware structure to constitute various processing units.

[0197] Furthermore, as the hardware configuration of these various processors, more specifically, a circuit combining circuit elements such as semiconductor elements can be used.

Claims

1. A radiation imaging device comprising: An irradiation portion having an irradiation opening for irradiating radiation; an image receiving section having an image receiving surface for receiving the radiation irradiated from the irradiating section and transmitted through the subject, and outputting a radiation image of the subject; an arm having the irradiation section disposed at one end and capable of supporting the image receiving section at the other end in a posture in which the irradiation opening of the irradiation section faces the image receiving surface, and capable of rotatably supporting the irradiation section in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; a locking mechanism for locking the rotation of the irradiation portion relative to the arm in an opposing posture in which the irradiation opening faces the image receiving surface; and The control unit is capable of causing the irradiation unit to perform irradiation for animation photography by continuously irradiating the radiation from the irradiation unit to perform animation photography of the subject, and allowing the irradiation for animation photography when the rotation of the irradiation unit is locked by the locking mechanism, and prohibiting the irradiation for animation photography when the rotation is unlocked by the locking mechanism.

2. The radiation imaging device according to claim 1, wherein: The control unit can cause the irradiation unit to perform irradiation for still image photography in addition to the irradiation for animation photography, wherein the irradiation for still image photography is performed by irradiating the radiation from the irradiation unit in a shorter time than the irradiation for animation photography to perform still image photography of the subject. The control unit permits the irradiation for still image photography even when the irradiation for moving image photography is prohibited.

3. The radiation imaging device according to claim 2, wherein: The image receiving unit is detachably mounted on the arm. The radiation imaging device includes a mounting and removal detection unit for detecting whether the image receiving unit is removed from the arm. Regardless of whether the rotation of the irradiation portion is locked by the locking mechanism, The control unit prohibits the irradiation for moving image shooting by the irradiation unit in a state where the image receiving unit is detached from the arm.

4. The radiation imaging device according to claim 2, wherein: The radiation imaging device includes a posture detection unit configured to detect whether the irradiation opening is in a facing posture with respect to the image receiving surface. The image receiving unit is detachably mounted on the arm. The radiation imaging device includes a mounting and removal detection unit for detecting whether the image receiving unit is removed from the arm. Regardless of whether the rotation of the irradiation portion is locked by the locking mechanism or whether the posture detection portion detects that the irradiation opening is in the facing posture, The control unit prohibits the irradiation for moving image shooting by the irradiation unit in a state where the image receiving unit is detached from the arm.

5. A radiation imaging device comprising: An irradiation portion having an irradiation opening for irradiating radiation; an image receiving section having an image receiving surface for receiving the radiation irradiated from the irradiating section and transmitted through the subject, and outputting a radiation image of the subject; an arm having the irradiation section disposed at one end and capable of supporting the image receiving section at the other end in a posture in which the irradiation opening of the irradiation section faces the image receiving surface, and rotatably supporting the irradiation section in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; a posture detection unit for detecting whether the irradiation opening is in an opposing posture relative to the image receiving surface; and a control unit capable of causing the irradiation unit to perform irradiation for animation photography by continuously irradiating the radiation from the irradiation unit to perform animation photography of the subject, and allowing the irradiation for animation photography when the posture detection unit detects that the irradiation opening is in the opposing posture, and prohibiting the irradiation for animation photography when the posture detection unit does not detect that the irradiation opening is in the opposing posture, The control unit can cause the irradiation unit to perform irradiation for still image photography in addition to the irradiation for animation photography, wherein the irradiation for still image photography is performed by irradiating the radiation from the irradiation unit in a shorter time than the irradiation for animation photography to perform still image photography of the subject. Even when the irradiation for moving image shooting is prohibited, the control unit can arbitrarily rotate the irradiation unit to permit the irradiation for still image shooting.

6. The radiation imaging device according to claim 1 or 5, wherein: The facing posture is a facing posture in which the central axis of the beam of radiation diffused in a cone shape from the focal point of the irradiation section through the irradiation opening coincides with the normal line of the image receiving surface.

7. The radiation imaging device according to claim 1 or 5, wherein: In a side view of the arm, when the direction in which the irradiation unit and the image receiving unit are provided is set to the front and the arm side is set to the rear, based on the arm, The irradiation portion rotates relative to the arm so that the orientation of the irradiation opening changes in the front-rear direction.

8. The radiation imaging device according to claim 1 or 5, wherein: The control by the control unit to prohibit the irradiation for animation photography includes at least one of the following controls: control to prohibit the start of the irradiation for animation photography when there is a command to start the animation photography; and control to stop the irradiation for animation photography during the animation photography.

9. The radiation imaging device according to claim 8, wherein: The control unit includes a warning unit configured to issue a warning in at least one of a case where the start of the irradiation for movie shooting is prohibited and a case where the irradiation for movie shooting is stopped during the movie shooting.

10. The radiation imaging device according to claim 1 or 5, wherein: The image receiving unit is detachably mounted on the arm. The radiation imaging device includes a mounting and removal detection unit for detecting whether the image receiving unit is removed from the arm. Regardless of whether the rotation of the irradiation portion is locked by the locking mechanism or whether the posture detection portion detects that the irradiation opening is in the facing posture, The control unit prohibits the irradiation for moving image shooting by the irradiation unit in a state where the image receiving unit is detached from the arm.

11. The radiation imaging device according to claim 7, wherein: The facing posture is a facing posture in which the central axis of the beam of radiation diffused in a cone shape from the focus of the irradiation unit through the irradiation opening coincides with the normal line of the image receiving surface. The illumination opening and the image receiving surface are respectively set to be rectangular, The image receiving unit is rotatable relative to the arm while maintaining the facing posture. The radiation imaging device has a rotation position detection unit, which detects the rotation position of the image receiving unit and detects at least four rotation positions where the four sides of the irradiation opening and the four sides corresponding to the four sides of the image receiving surface are parallel and set at 90° intervals when the irradiation opening is projected onto the image receiving surface. Regardless of whether the rotation of the irradiation portion is locked by the locking mechanism or whether the posture detection portion detects that the irradiation opening is in the facing posture, When the image receiving unit is in any rotational position other than the four rotational positions, the control unit prohibits the irradiation for moving image shooting by the irradiation unit.

12. The radiation imaging device according to claim 7, wherein: The image receiving unit is detachably mounted on the arm. The radiation imaging device includes a mounting and removal detection unit for detecting whether the image receiving unit is removed from the arm. Regardless of whether the rotation of the irradiation portion is locked by the locking mechanism or whether the posture detection portion detects that the irradiation opening is in the facing posture, The control unit prohibits the irradiation for moving image shooting by the irradiation unit in a state where the image receiving unit is detached from the arm.

13. A method for controlling a radiation imaging device, the radiation imaging device comprising: An irradiation portion having an irradiation opening for irradiating radiation; an image receiving section having an image receiving surface for receiving the radiation irradiated from the irradiating section and transmitted through the subject, and outputting a radiation image of the subject; an arm having the irradiation section disposed at one end and capable of supporting the image receiving section at the other end in a posture in which the irradiation opening of the irradiation section faces the image receiving surface, and capable of rotatably supporting the irradiation section in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; and A control unit capable of causing the irradiation unit to perform irradiation for animation photography by continuously irradiating the radiation from the irradiation unit to perform animation photography of the subject, wherein the control unit performs at least one of the following controls, namely, A first control for allowing the irradiation for animation photography when the rotation of the irradiation portion is locked by a locking mechanism, and prohibiting the irradiation for animation photography when the rotation is unlocked by a locking mechanism, wherein the locking mechanism locks the rotation of the irradiation portion relative to the arm in an opposing posture in which the irradiation opening faces the image receiving surface; and The second control allows the irradiation for animation photography when the posture detection unit detects that the irradiation opening is in the opposing posture, and prohibits the irradiation for animation photography when the posture detection unit does not detect that the irradiation opening is in the opposing posture. The posture detection unit detects whether the irradiation opening is in the opposing posture relative to the image receiving surface. Under the second control, The control unit can cause the irradiation unit to perform irradiation for still image photography in addition to the irradiation for animation photography, wherein the irradiation for still image photography is performed by irradiating the radiation from the irradiation unit in a shorter time than the irradiation for animation photography to perform still image photography of the subject. Even when the irradiation for moving image shooting is prohibited, the control unit can arbitrarily rotate the irradiation unit to permit the irradiation for still image shooting.

14. A radiation imaging device comprising: An irradiation portion having an irradiation opening for irradiating radiation; an image receiving section having an image receiving surface for receiving the radiation irradiated from the irradiating section and transmitted through the subject, and outputting a radiation image of the subject; an arm having the irradiation section disposed at one end and capable of supporting the image receiving section at the other end in a posture in which the irradiation opening of the irradiation section faces the image receiving surface, and rotatably supporting the irradiation section in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; a posture detection unit for detecting whether the irradiation opening is in an opposing posture relative to the image receiving surface; and a control unit capable of causing the irradiation unit to perform irradiation for animation photography by continuously irradiating the radiation from the irradiation unit to perform animation photography of the subject, and allowing the irradiation for animation photography when the posture detection unit detects that the irradiation opening is in the opposing posture, and prohibiting the irradiation for animation photography when the posture detection unit does not detect that the irradiation opening is in the opposing posture, The image receiving unit is detachably mounted on the arm. The radiation imaging device includes a mounting and removal detection unit for detecting whether the image receiving unit is removed from the arm. Regardless of whether the posture detection unit detects that the irradiation opening is in the facing posture, the control unit prohibits the irradiation unit from irradiating for movie shooting in a state where the image receiving unit is detached from the arm.

15. A radiation imaging device comprising: An irradiation portion having an irradiation opening for irradiating radiation; an image receiving section having an image receiving surface for receiving the radiation irradiated from the irradiating section and transmitted through the subject, and outputting a radiation image of the subject; an arm having the irradiation section disposed at one end and capable of supporting the image receiving section at the other end in a posture in which the irradiation opening of the irradiation section faces the image receiving surface, and rotatably supporting the irradiation section in a direction in which the orientation of the irradiation opening relative to the image receiving surface is changed; a posture detection unit for detecting whether the irradiation opening is in an opposing posture relative to the image receiving surface; and a control unit capable of causing the irradiation unit to perform irradiation for animation photography by continuously irradiating the radiation from the irradiation unit to perform animation photography of the subject, and allowing the irradiation for animation photography when the posture detection unit detects that the irradiation opening is in the opposing posture, and prohibiting the irradiation for animation photography when the posture detection unit does not detect that the irradiation opening is in the opposing posture, The facing posture is a facing posture in which the central axis of the beam of radiation diffused in a cone shape from the focus of the irradiation unit through the irradiation opening coincides with the normal line of the image receiving surface. The illumination opening and the image receiving surface are respectively set to be rectangular, The image receiving unit is rotatable relative to the arm while maintaining the facing posture. The radiation imaging device has a rotation position detection unit, which detects the rotation position of the image receiving unit and detects at least four rotation positions where the four sides of the irradiation opening and the four sides corresponding to the four sides of the image receiving surface are parallel and set at 90° intervals when the irradiation opening is projected onto the image receiving surface. Regardless of whether the posture detection unit detects that the irradiation opening is in the facing posture, the control unit prohibits the irradiation for animation photography by the irradiation unit when the image receiving unit is in a rotational position other than the four rotational positions.

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