Radiography device

Abstract

This device comprises: an X-ray tube 11; an X-ray detector 9; an X-ray image generation unit 51; and an optical image capturing unit 29 arranged in an inspection room R1. The optical image capturing unit 29 includes: a housing 33; an opening 35 arranged on the housing 33; an optical lens 37 of a photographic camera 36 arranged inside the housing 33 so as to face the opening 35; and a shielding member 41 configured to be movable between a shielding position P1 and a retreat position P2 inside the housing 33 and capable of shielding the optical lens 37. The shielding member 41 is configured to shield the optical lens 37 so that the optical lens 37 cannot be visually recognized from the outside of the opening 35 in a state where the shielding member 41 is moved to the shielding position P1, and to enable the photographic camera 36 to capture an optical image through the opening 35 in a state where the shielding member 41 is moved to the retreat position P2.

Description

Radiography equipment

[0001] The present invention relates to a radiographic apparatus.

[0002] In medical settings, a radiographic imaging device, such as an X-ray imaging device, is used to capture a radiographic image of a subject, and the radiographic image is used to perform diagnostic or therapeutic procedures. A configuration has been proposed for such a radiographic imaging device, which includes an optical imaging device, such as a camera. The optical imaging device captures an optical image of the subject by irradiating the subject with visible light or the like. The captured optical image can be used to identify the position of the radiation irradiation field in the radiographic image, detect positional deviation of the subject, or correct the subject's posture.

[0003] As a conventional configuration, a radiographic imaging device has been proposed in which a camera is disposed on a collimator and is disposed in an examination room (for example, Patent Document 1). The camera includes a housing having an opening and an optical lens disposed inside the housing so as to face the opening. That is, by disposing the optical lens and the subject facing each other across the opening of the housing, the optical imaging device can capture an optical image of the subject using the optical lens.

[0004] JP 2023-25975 A

[0005] However, the conventional example having such a configuration has the following problems.

[0006] In the optical imaging device, the optical lens is configured to be visible from the outside through the opening. Therefore, when an optical image and a radiological image are captured while the subject faces the camera, there is a concern that the subject may feel uneasy when looking at the optical lens. One example of such uneasiness is the fear that the subject's personal information may be violated when the subject changes clothes, for example, because the camera may capture an optical image of the subject against the subject's will.

[0007] Furthermore, in recent years, it is expected that radiographic imaging devices will be used in a wider variety of regions around the world. As a result, there is a new concern that, in some regions, due to religious reasons or other reasons, subjects may suffer significant psychological harm due to the presence of optical imaging devices. For example, there is a new concern that it may be taboo to point an optical lens at a subject, or that the subject may find it psychologically unacceptable to have an optical lens pointed at them.

[0008] The present invention has been made in consideration of the above circumstances, and aims to provide a radiographic imaging apparatus that enables optical images to be captured while preventing the subject from experiencing anxiety or mental disadvantage.

[0009] In order to achieve the above object, the present invention is configured as follows: That is, a first aspect of the present invention relates to a radiographic system installed in an examination room, comprising: a radiation source that irradiates a subject with radiation, a radiation detector that detects radiation that has passed through the subject, a radiographic image generation unit that generates a radiographic image of the subject using a detection signal output by the radiation detector, and an optical image capture unit that is arranged in the examination room and captures an optical image of the subject, wherein the optical image capture unit comprises a housing, an opening arranged in the housing, an optical lens of an imaging camera that is arranged inside the housing to face the opening, and a non-transparent shielding member that is movable inside the housing between a first position and a second position and is capable of shielding the optical lens, wherein the shielding member shields the optical lens so that the optical lens cannot be seen from outside the opening when moved to the first position, and allows the imaging camera to capture the optical image through the opening when moved to the second position.

[0010] A second aspect of the present invention relates to an optical imaging device that is disposed in a radiation imaging system installed in an examination room and that captures optical images of a subject, the optical imaging device comprising: a housing; an opening disposed in the housing; an optical lens of an imaging camera disposed inside the housing so as to face the opening; and a non-transparent shielding member configured to be movable between a first position and a second position inside the housing and capable of shielding the optical lens, wherein the shielding member, when moved to the first position, shields the optical lens so that the optical lens cannot be seen from outside the opening, and, when moved to the second position, allows the imaging camera to capture the optical image through the opening; and the optical imaging device is disposed in the examination room.

[0011] A radiation imaging system according to a first aspect of the present invention includes a radiation image generating unit that generates a radiation image of a subject and an optical image capturing unit that captures an optical image of the subject. The optical image capturing unit included in the radiation imaging system according to the first aspect of the present invention and the optical image capturing device according to a second aspect of the present invention include a housing having an opening, an optical lens, a transparent protective member, and a non-transparent shielding member. The optical lens is disposed inside the housing so as to face the opening.

[0012] The shielding member shields the optical lens and is configured to be movable between a first position and a second position inside the housing. When the shielding member is moved to the first position, it shields the optical lens so that it cannot be seen from outside the opening. In this case, since the shielding member shields the optical lens, the optical lens cannot be seen through the opening. Therefore, it is possible to avoid the subject experiencing anxiety or mental disadvantage due to the optical lens being pointed at the subject in a visible state.

[0013] On the other hand, when the shielding member is moved to the second position, the shielding member does not shield the optical lens. In this case, the optical lens becomes visible from outside the opening. That is, by moving the shielding member to the second position, optical images can be captured by the imaging camera through the opening. Therefore, the optical lens of the imaging camera can be configured to be directed toward the subject in a visible state only when it is necessary to capture an optical image. This prevents the subject from feeling anxious that the optical lens may actually be directed toward them when they are not aware that the optical lens is actually being directed toward them. Furthermore, if the optical lens cannot be directed toward the subject for religious reasons or other reasons, the shielding member can be moved to the first position to shield the optical lens and capture a radiographic image, thereby preventing the subject from suffering psychological harm caused by the optical lens.

[0014] FIG. 1 is a front view illustrating the overall configuration of a radiation imaging system. FIG. 2 is a right side view illustrating a main part of the radiation imaging system. FIG. 3 is a perspective view illustrating a main part of the radiation imaging system. FIG. 4 is a diagram illustrating the configuration of a camera. FIG. 5 is a longitudinal sectional view illustrating the configuration of an optical image imaging unit. FIG. 6 is a functional block diagram illustrating the configuration of a radiation imaging system. FIG. 7 is a diagram illustrating a camera in a state where a shielding member is moved to an imaging possible position. FIG. 8 is a longitudinal sectional view illustrating a camera in a state where a shielding member is moved to an imaging possible position. FIG. 9 is a diagram illustrating a camera in a state where a shielding member is moved to a shielding position. FIG. 10 is a longitudinal sectional view illustrating a camera in a state where a shielding member is moved to a shielding position. FIG. 11 is a functional block diagram illustrating the configuration of a radiation imaging system according to a modified example. FIG. 12 is a front view illustrating the overall configuration of a radiation imaging system according to a modified example.

[0015] An X-ray imaging system 1 according to an embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the X-ray imaging system 1 corresponds to a radiation imaging system. FIG. 1 is a front view of the X-ray imaging system 1.

[0016] <Explanation of Overall Configuration> As shown in FIG. 1, an X-ray imaging system 1 according to this embodiment includes an X-ray generation unit 3, a support mechanism 5, a top plate 7, and an X-ray detector 9.

[0017] 2 is a right side view of the X-ray generation unit 3 and the support mechanism 5. As shown in FIGS. 1 and 2, the X-ray generation unit 3 includes an X-ray tube 11 and an operating handle 13. The X-ray generation unit 3 is supported so as to be suspended from the ceiling T by the support mechanism 5. The support mechanism 5 hangs down from the ceiling T via rails 15 and a ceiling run 17. The rails 15 extend in the x direction along the ceiling T. The ceiling run 17 is configured to be able to move back and forth in the x direction along the rails 15.

[0018] The support mechanism 5 includes a rail 19, a guide unit 21, a support pillar 23, and a rotation holder 24. The rail 19 is connected to the ceiling running unit 17 and extends in the y direction. The guide unit 21 is configured to be able to reciprocate in the y direction along the rail 19. The support pillar 23 is connected to the lower part of the guide unit 21 and is able to extend and retract in the z direction (vertical direction). With this configuration, the support mechanism 5 supports the X-ray generation unit 3 so that it can move in each of the translation directions of the x direction, y direction, and z direction.

[0019] The rotary holder 24 is disposed at the bottom of the support column 23 and is configured to be rotatable around an axis in the z direction. One end of the rotary holder 24 is connected to the support column 23. The other end of the rotary holder 24 holds the X-ray generation unit 3 so that it can be rotatable around an axis in the x direction. The X-ray generation unit 3 is also configured to be rotatable around an axis in the y direction by a rotation drive mechanism (not shown). With this configuration, the X-ray generation unit 3 can move linearly together with the support mechanism 5 in each of the x, y, and z directions. The X-ray generation unit 3 can also be rotated around the axis in the x, y, and z directions by the rotary holder 24.

[0020] The tabletop 7 is used for placing the subject M in a supine position on the tabletop 7 when X-ray imaging is performed in the supine position. An X-ray detector 9 is disposed on the tabletop 7.

[0021] The X-ray tube 11 irradiates the subject M with X-rays. The X-ray detector 9 is configured to be movable, and detects the X-rays irradiated from the X-ray tube 11 and converts them into an electrical signal. The X-ray tube 11 and the X-ray detector 9 constitute an imaging system. A collimator 27 is provided below the X-ray tube 11. In this embodiment, an optical image capturing unit 29 is installed in the collimator 27. In this embodiment, the X-ray detector 9 corresponds to a radiation detector. In this embodiment, the X-ray tube 11 corresponds to a radiation source.

[0022] <Configuration of Optical Image Capture Unit> Next, the configuration of the optical image capture unit 29 according to this embodiment will be described. Figures 3 to 5 are views showing the optical image capture unit 29 disposed in the collimator 27. Figure 3 is a perspective view of the collimator 27 and the optical image capture unit 29 as viewed obliquely from below. Figure 4 is a bottom view of the collimator 27 in which the optical image capture unit 29 is disposed. Figure 5 is a vertical cross-sectional view of the collimator 27 and the optical image capture unit 29.

[0023] 3 and 5, the collimator 27 has an opening 31 penetrating in the z direction, and a plurality of X-ray shielding plates (not shown) are disposed inside the opening 31. The X-ray shielding plates are made of a material that blocks X-rays, and the spread of the X-rays irradiated from the X-ray tube 11 is adjusted by moving each X-ray shielding plate in the x direction or y direction.

[0024] 2 and 3, the optical image capturing unit 29 is disposed on the lower surface of the collimator 27. The optical image capturing unit 29 optically captures an optical image of the subject M placed on the top board 7. In this embodiment, the optical image capturing unit 29 corresponds to an optical image capturing device.

[0025] In this embodiment, the optical image capturing unit 29 captures an image of the subject M using visible light, thereby acquiring a visible light image of the subject M. Note that the mode of optically capturing an image of the subject M is not limited to capturing an image using visible light to acquire a visible light image, and may be capturing an image using infrared light to acquire an infrared image of the subject, for example. In other words, the optical image capturing unit 29 is not limited to a digital camera that captures visible light images, but may also be an infrared camera that captures infrared images. In this embodiment, the visible light image corresponds to the optical image.

[0026] The optical image capturing unit 29 includes a housing 33, an opening 35, a capturing camera 36, ​​a protective member 39, and a shielding member 41. The housing 33 houses components of the optical image capturing unit 29, such as the capturing camera 36, ​​the protective member 39, and the shielding member 41. Examples of materials for the housing 33 include metal and resin. The opening 35 is formed in a part of the outer wall of the housing 33 and is configured to penetrate the outer wall. In this embodiment, as shown in FIG. 5 , the opening 35 is formed on the bottom surface of the housing 33.

[0027] The photographing camera 36 includes an optical lens 37. The optical lens 37 collects light from the subject and forms an image on an image sensor (not shown). This image generates a light detection signal. The optical lens 37 is disposed opposite the opening 35. That is, by disposing the optical lens 37 and the subject M opposite each other across the opening 35, the optical image photographing unit 29 can photograph a visible light image of the subject M using the photographing camera 36. Note that the photographing camera 36 shown in each figure does not appropriately depict mechanisms used to photograph optical images, such as an aperture, shutter, and image sensor. As an example, the photographing camera 36 is a digital camera incorporating a CMOS (Complementary Metal Oxide Semiconductor) image sensor.

[0028] The protective member 39 is disposed between the opening 35 and the optical lens 37 and protects the optical lens 37 from dust and other particles. The protective member 39 is optically transparent. In this embodiment, the protective member 39 separates the space H1 in which the optical lens 37 is disposed inside the housing 33 from the external space of the opening 35. That is, the space H1 in which the optical lens 37 is disposed is an enclosed space surrounded by the protective member 39 and the housing 33. By making the space H1 an enclosed space, deterioration of the optical lens 37 due to dust, condensation, and the like can be prevented. Note that, in order to capture optical images using the optical lens 37 with higher accuracy, the protective member 39 is preferably made of a material with higher optical transparency. An example of a material for the protective member 39 is an acrylic resin.

[0029] The shielding member 41 is disposed between the opening 35 and the optical lens 37 in the z direction. The shielding member 41 is opaque to light. The shielding member 41 is configured to be reciprocally movable in the x direction between a shielding position P1 and a retracted position P2. As an example, the shielding member 41 moves reciprocally in the x direction by sliding along a support member (not shown). The shielding member 41 is made of a material that blocks light, such as visible light and infrared light. In other words, the shielding member 41 is made of a material that blocks light and thereby prevents the optical lens 37 from capturing an optical image. In this embodiment, a plate-shaped member made of iron is used as the shielding member 41.

[0030] When the shielding member 41 moves to the shielding position P1, the shielding member 41 optically shields the area between the opening 35 and the optical lens 37. That is, when the shielding member 41 moves to the shielding position P1, the optical lens 37 cannot be seen through the opening 35 from outside the housing 33. On the other hand, when the shielding member 41 moves to the retracted position P2, the shielding member 41 retracts from the area between the opening 35 and the optical lens 37. That is, when the shielding member 41 moves to the retracted position P2, the optical lens 37 can be seen through the opening 35 from outside the housing 33. Note that FIGS. 4 and 5 show a state in which the shielding member 41 is shielding a portion of the optical lens 37. In FIG. 4, the portion of the opening 35 where the shielding member 41 is present is indicated by a dotted line. Also, in FIG. 4, the portion of the opening 35 where the shielding member 41 can be seen through the opening 35 is indicated by a diagonal line. In this embodiment, the shielding position P1 corresponds to the first position. In this embodiment, the retracted position P2 corresponds to the second position.

[0031] In this embodiment, the operation of appropriately moving the shielding member 41 between the shielding position P1 and the retracted position P2 is configured to be performed manually. As an example, the shielding member 41 has a protrusion 41a that protrudes downward. When an operator grips the protrusion 41a and slides the shielding member 41 in the x direction, the shielding member 41 can slide in the x direction along a support member (not shown).

[0032] The optical image capture unit 29 further includes a magnet 42a and a magnet 42b. In this embodiment, as shown in FIG. 4, two magnets 42a are arranged in parallel in the y direction. Furthermore, two magnets 42b are arranged in parallel in the y direction. As shown in FIG. 5, the magnets 42a and 42b each penetrate the housing 33 in the z direction. The magnet 42a is arranged on the side of the shielding position P1 in the x direction, out of the shielding position P1 and the retracted position P2. The magnet 42b is arranged on the side of the retracted position P2 in the x direction, out of the shielding position P1 and the retracted position P2.

[0033] When the shielding member 41 moves from the retracted position P2 to the shielding position P1, the magnet 42a fixes the position of the shielding member 41 at the shielding position P1. That is, when the shielding member 41 moves to the shielding position P1, one end of the shielding member 41 (the upper side in FIG. 4 ) approaches the magnet 42a. The shielding member 41 is made of iron, which is a magnetic material. Therefore, when one end of the shielding member 41 approaches the magnet 42a, the magnetic force of the magnet 42a fixes the shielding member 41 at the shielding position P1. In this embodiment, the magnet 42a corresponds to a first fixing member.

[0034] When the shielding member 41 moves from the shielding position P1 to the retracted position P2, the magnet 42b fixes the position of the shielding member 41 at the retracted position P2. That is, when the shielding member 41 moves to the retracted position P2, the other end of the shielding member 41 (the lower side in FIG. 4 ) approaches the magnet 42b. The shielding member 41 is made of iron, which is a magnetic material. Therefore, when the other end of the shielding member 41 approaches the magnet 42b, the magnetic force of the magnet 42b fixes the shielding member 41 at the retracted position P2. In this embodiment, the magnet 42b corresponds to a second fixing member.

[0035] 6, the X-ray imaging system 1 further includes a main control unit 43, a display unit 45, an input unit 47, and a storage unit 48. The main control unit 43 includes, for example, an information processing unit such as a central processing unit (CPU) and performs overall control of various components in the X-ray imaging system 1.

[0036] As shown in FIG. 2 , the main control unit 43 includes an X-ray tube control unit 49, an X-ray image generation unit 51, a camera control unit 53, and an optical image generation unit 55. The X-ray tube control unit 49 is configured to output a high voltage to the X-ray tube 11. Based on the high voltage output controlled by the X-ray tube control unit 49, the amount of X-rays emitted by the X-ray tube 11 and the timing at which the X-ray tube 11 emits X-rays are controlled. The X-ray image generation unit 51 performs various image processing based on the X-ray detection signal output from the X-ray detector 9. An X-ray image of the subject M is generated by this image processing. In this embodiment, the X-ray image corresponds to a radiographic image. In this embodiment, the X-ray image generation unit 51 corresponds to a radiographic image generation unit.

[0037] The camera control unit 53 performs overall control of the components of the optical image capturing unit 29. For example, the camera control unit 53 controls the operation of a shutter (not shown) and the aperture opening. The optical image generating unit 55 performs various image processing based on the light detection signal output from the optical image capturing unit 29. An optical image of the subject M is generated by the image processing.

[0038] The display unit 45 displays various data such as the X-ray image generated by the X-ray image generation unit 51 and the optical image generated by the optical image generation unit 55. Examples of the display unit 45 include a liquid crystal display or a high-resolution monitor.

[0039] The input unit 47 is used to input instructions from the operator regarding the operation of the X-ray imaging system 1, and the main control unit 43 performs various controls in accordance with the instructions input by the operator to the input unit 47. Examples of operation devices disposed in the input unit 13 include a keyboard input panel, a touch input panel, a mouse, and a switch.

[0040] The storage unit 48 stores information such as the X-ray images generated by the X-ray image generation unit 51, the optical images generated by the optical image generation unit 55, information related to image processing of the X-ray images, and various information related to the operation of the X-ray imaging system 1. The stored information is read out as needed and output to the display unit 45, etc. via the main control unit 43. The storage unit 48 is configured with a storage medium such as a non-volatile memory.

[0041] <Operation of X-ray Imaging System> Here, the operation for capturing an optical image and an X-ray image of the subject M using the X-ray imaging system 1 will be described in order. It is assumed that in the initial state, the shielding member 41 is in the position shown in Figures 4 and 5. In Figures 4 and 5, the direction in the x direction from the retracted position P2 to the shielding position P1 is indicated by the symbol x1. In addition, the direction in the x direction from the shielding position P1 to the retracted position P2 is indicated by the symbol x2.

[0042] Before the subject M enters the examination room R1 in which the X-ray imaging system 1 is installed, the operator operates the shielding member 41 to shield the optical lens 37. That is, the operator checks the optical image capturing unit 29 and grasps the protrusion 41a formed on the shielding member 41. Then, while grasping the protrusion 41a, the operator slides the shielding member 41 in the x1 direction. In this manner, the operator manually operates the shielding member 41, whereby the shielding member 41 moves from the initial position to the shielding position P1. The state in which the shielding member 41 has moved to the shielding position P1 is shown in FIG. 7, a bottom view, and FIG. 8, a vertical cross-sectional view.

[0043] As the shielding member 41 moves to the shielding position P1, one end of the shielding member 41 approaches the magnet 42a. This one end of the shielding member 41 corresponds to the upper end of the shielding member 41 in Fig. 4 and the right end of the shielding member 41 in Fig. 5. When the shielding member 41 approaches the magnet 42a, the magnetic force of the magnet 42a acts on the one end of the shielding member 41, which is a magnetic body, and the shielding member 41 is attracted to the magnet 42a. As a result, even if the operator releases his or her hand from the protrusion 41a, the magnet 42a fixes the shielding member 41 at the shielding position P1.

[0044] By fixing the shielding member 41 at the shielding position P1, the area between the optical lens 37 and the opening 35 is shielded by the opaque shielding member 41, as shown in Fig. 8 . That is, light L traveling from outside the housing 33 through the opening 35 toward the optical lens 37 is reliably shielded by the shielding member 41. Hereinafter, the state in which the light L is reliably shielded by the shielding member 41 is referred to as the shielding state. As a result, as shown in Fig. 7 , the optical lens 37 cannot be seen from outside the housing 33. That is, by moving the shielding member 41 to the shielding position P1, the photographing camera 36 of the optical image photographing unit 29 cannot photograph an optical image of the photographing target through the opening 35.

[0045] After moving the shielding member 41 to the shielding position P1, the operator has the subject M enter the examination room R1. Then, the operator instructs the subject M to change from his everyday clothes into clothes for X-ray imaging.

[0046] When the subject M enters the examination room R1, the optical lens 37 is already shielded by the shielding member 41. Therefore, the subject M and the optical lens 37 do not face each other through the opening 35 while the optical lens 37 is visible. In other words, the subject M does not realize that the optical lens 37 is pointed at him / her through the opening 35. In fact, since the shielding member 41 shields the optical lens 37, an optical image of the subject M, i.e., a photograph of the subject M, cannot be taken. Therefore, the subject M does not have to worry that an optical image of the subject M will be taken without the subject M's permission while he / she is changing clothes. In other words, the subject M does not have to worry that his / her personal information will be infringed without his / her permission.

[0047] After the subject M has changed into clothing for X-ray imaging, the operator places the subject M in a supine position on the tabletop 7. Here, as a preliminary step to capturing an X-ray image of the subject M, an optical image of the subject M is captured. That is, the operator operates the operating handle 13 to move the X-ray generation unit 3 and adjust the position and direction of the optical image capturing unit 29. By performing this adjustment, the optical image capturing unit 29 is placed in a state where the opening 35 faces downward. That is, the optical camera 37 faces the subject M across the shielding member 41 and the opening 35. At this point, the subject M cannot see the optical camera 37 through the opening 35.

[0048] After adjusting the position and orientation of the optical image capture unit 29, the operator moves the shielding member 41 from the shielding position P1 to the retracted position P2. That is, the operator grips the protrusion 41a formed on the shielding member 41. Then, while gripping the protrusion 41a, the operator slides the shielding member 41 in the x2 direction. At this time, by applying a force to the shielding member 41 that exceeds the magnetic force of the magnet 42a, the shielding member 41 can be easily moved from the shielding position P1 to the x2 direction. Therefore, the operation of moving the shielding member 41 in the x2 direction from the shielding position P2 can be performed more quickly and easily.

[0049] When an operator manually moves the shielding member 41 in the x2 direction, the shielding member 41 moves from the shielding position P1 to the retracted position P2. The state in which the shielding member 41 has moved to the retracted position P2 is shown in Fig. 9, a bottom view, and Fig. 10, a vertical cross-sectional view.

[0050] As the shielding member 41 moves to the retracted position P2, the other end of the shielding member 41 approaches the magnet 42b. The other end of the shielding member 41 corresponds to the bottom end of the shielding member 41 in Fig. 4 and the left end of the shielding member 41 in Fig. 5. When the shielding member 41 approaches the magnet 42b, the magnetic force of the magnet 42b acts on the other end of the shielding member 41, which is a magnetic material, and the shielding member 41 is attracted to the magnet 42b. As a result, even if the operator releases his or her hand from the protrusion 41a, the magnet 42b fixes the shielding member 41 in the retracted position P2.

[0051] 10 , by fixing the shielding member 41 at the retracted position P2, the shielding member 41 is retracted from the area between the optical lens 37 and the opening 35. That is, the shielding state by the shielding member 41 is released, and light L traveling from outside the housing 33 of the optical image capturing unit 29 through the opening 35 toward the optical lens 37 can enter the optical lens 37. As a result, as shown in FIG. 9 , the optical lens 37 can be viewed from outside the housing 33. That is, by moving the shielding member 41 to the retracted position P2, the photographing camera 36 provided in the optical image capturing unit 29 can capture an optical image of the subject through the opening 35.

[0052] After being placed on the tabletop 7, the subject M, while facing the optical image capturing unit 29, visually observes the operator moving the shielding member 41 to the retracted position P2. Once the operation of moving the shielding member 41 to the retracted position P2 is completed, the subject M can visually observe the optical lens 37 from outside the housing 33 through the opening 35. As a result, the subject M understands that an optical image of the subject M will now be captured by the optical lens 37. Furthermore, the subject M can understand that the optical lens 37 was not directed toward the subject M in a state where imaging was possible until the operator moved the shielding member 41 to the retracted position P2. As a result, the subject M can feel secure knowing that optical images of the subject M, which contain personal information, were not captured without the subject M's permission, for example, while the subject M was changing into clothes for X-ray imaging.

[0053] After the operator moves the shielding member 41 to the retracted position P2, the operator captures an optical image of the subject M. At this time, the shielding state of the shielding member 41 is released, so light L enters the optical lens 37 through the opening 35, as shown in FIG. 10 . Note that, because the protective member 39 is made of a transparent material, the light L passes through the protective member 39 without being reduced. This prevents the protective member 39 from blocking the light L from entering the optical lens 37.

[0054] To start capturing an optical image, the operator operates the input unit 45 to input an instruction to capture an optical image of the subject M. By operating the input unit 45, the camera control unit 53 in the main control unit 43 controls the optical image capturing unit 29 to start the operation of capturing an optical image of the subject M. Light L from the subject M passes through the opening 35 and is collected by the optical lens 37. The light L collected by the optical lens 37 is detected by an imaging element (not shown), and a light detection signal is emitted. The optical image generation unit 55 generates an optical image of the subject M based on the light detection signal. By checking the positions of characteristic parts of the subject M that appear in the generated optical image, the operator can accurately grasp the appropriate capturing range for the X-ray image of the subject M.

[0055] After confirming the appropriate X-ray imaging range by capturing an optical image of the subject M, the operator ends the optical imaging and starts X-ray imaging. That is, the operator operates the input unit 45 to input an instruction to capture an X-ray image of the subject M. Based on the input instruction, the X-ray tube control unit 49 controls the X-ray tube 11 to irradiate X-rays onto the subject M. The X-ray detector 9 detects X-rays irradiated from the X-ray tube 11 and transmitted through a region of interest in the subject M, and outputs an X-ray detection signal. The X-ray image generation unit 53 generates an X-ray image showing the region of interest in the subject M based on the X-ray detection signal output by the X-ray detector 9. The operator uses the generated X-ray image of the subject M to diagnose or treat the subject M. The X-ray imaging ends when the X-ray image of the subject M is acquired.

[0056] When X-ray imaging is completed, the operator moves the shielding member 41 from the retracted position P2 to the shielding position P1 to switch it back to the shielded state. That is, while holding the protrusion 41a, the operator slides the shielding member 41 in the x1 direction. At this time, by applying a driving force to the shielding member 41 that exceeds the magnetic force of the magnet 42b, the shielding member 41 can be easily moved from the retracted position P2 to the x1 direction. Therefore, the operation of moving the shielding member 41 in the x1 direction from the retracted position P2 can be performed more quickly and easily.

[0057] When the operator manually moves the shielding member 41 in the x1 direction, the shielding member 41 moves from the retracted position P2 to the shielding position P1, as shown in Figures 7 and 8. When the shielding member 41 moves to the shielding position P1, one end of the shielding member 41 is attracted to the magnet 42a. As a result, the shielding member 41 is fixed at the shielding position P1 by the magnet 42a.

[0058] By moving the shielding member 41 to the shielding position P1, the optical image capturing unit 29 is again placed in the shielded state. That is, the light L is securely blocked by the shielding member 41, and the optical lens 37 cannot be seen from outside the housing 33. By visually checking the optical image capturing unit 29 in the shielded state, the subject M can confirm that the optical lens 37 cannot be seen from outside the housing 33 through the opening 35. That is, the subject M can confirm that the optical image capturing unit 29 cannot capture an optical image.

[0059] After switching the optical image capturing unit 29 to the shielded state, the operator removes the subject M from the tabletop 7. The operator then instructs the subject M to change from the X-ray imaging clothes into everyday clothes. Since the subject M has confirmed that the optical image capturing unit 29 is in a state where optical images cannot be captured, the subject M can feel secure that optical images of the subject M will not be captured without the subject M's permission while he or she is changing clothes. In other words, the subject M can avoid feeling anxious about his or her personal information being known to an unspecified number of people.

[0060] After the subject M has finished changing clothes, the operator causes the subject M to leave the examination room R1. With the above steps, the series of steps for performing X-ray imaging of the subject M using the X-ray imaging system 1 is completed.

[0061] Here, an operation of performing X-ray imaging on the subject M will be described in a case where, due to religious reasons or the like, it is not permitted to point the optical lens 37 directly at the subject M while the optical lens 37 is visible from the outside. When it is not permitted to point the optical lens 37, visible from the outside, at the subject M, the operator omits capturing an optical image using the optical image capturing unit 29, and captures an X-ray image while maintaining the optical lens 37 in a shielded state by the shielding member 41.

[0062] That is, the operator moves the shielding member 41 to the shielding position P1, and then has the subject M enter the examination room R1. Then, after the subject M has changed into clothes for X-ray imaging, X-ray imaging is started without using the optical image capturing unit 29. That is, X-ray images are captured while the shielding member 41 is maintained in the shielding position P1. Note that, as a configuration for checking the X-ray irradiation field in advance, a visible light lamp and a mirror (not shown) may be used to indirectly irradiate the subject M with visible light that is irradiated over the same range as the X-ray irradiation field. By using such a visible light lamp, the range of the X-ray irradiation field can be checked without violating religious taboos that would arise from pointing the optical lens 37 directly at the subject M.

[0063] When X-ray imaging is started, the input unit 45 is operated to cause the X-ray tube 11 to irradiate the subject M with X-rays. The X-rays irradiated from the X-ray tube 11 are detected by the X-ray detector 9, and the X-ray image generation unit 51 generates an X-ray image based on the detection signal of the X-ray detector 9. After an X-ray image of the subject M is acquired, the operator has the subject M change clothes and leave the examination room R1. In the X-ray imaging system 1 equipped with the shielding member 41, the area between the opening 35 and the optical lens 37 can be constantly shielded by the shielding member 41. In other words, in the X-ray imaging system 1 according to this embodiment, X-ray imaging can be performed on the subject M while maintaining a state in which the optical lens 37 cannot be seen from outside the housing 33.

[0064] Conventional X-ray imaging devices do not have a member that optically shields the optical lens from the external space of the housing. Therefore, the optical lens is always visible from outside the housing. In other words, the optical lens is always pointed directly at the subject. Therefore, if it is not permitted to point the optical lens directly at the subject for religious reasons or other reasons, it is not permitted to perform X-ray imaging using conventional X-ray imaging devices.

[0065] On the other hand, the X-ray imaging system 1 according to this embodiment is provided with a shielding member 41 in the optical image capturing unit 29. The shielding member 41 is configured to be able to move appropriately between a shielding position P1 and a retracted position P2. By moving the shielding member 41 to the shielding position P1, the optical lens 37 cannot be seen from outside the housing 33 through the opening 35. In other words, by performing X-ray imaging of the subject M with the shielding member 41 moved to the shielding position P1, the X-ray imaging system 1 can be used without violating the taboo of pointing the optical lens 37 directly at the subject M.

[0066] <Effects of the Configuration of the Embodiment> (Item 1) A radiographic system (1) according to this embodiment is a radiographic system installed in an examination room R1, and includes an X-ray tube 11 that irradiates X-rays onto a subject M, an X-ray detector 9 that detects X-rays that have passed through the subject M, an X-ray image generation unit 51 that generates an X-ray image of the subject M using a detection signal output by the X-ray detector 9, and an optical image capture unit 29 that is disposed in the examination room R1 and captures an optical image of the subject M. The optical image capture unit 29 includes a housing 33, an opening 35 disposed in the housing 33, and an optical image capture unit 29 that faces the opening 35. and a non-transparent shielding member 41 configured to be movable between a shielding position P1 and a retracted position P2 within the housing 33 and capable of shielding the optical lens 37. When the shielding member 41 is moved to the shielding position P1, it shields the optical lens 37 so that the optical lens 37 cannot be seen from outside the opening 35, and when moved to the retracted position P2, it is configured to allow the photographing camera 36 to take an optical image through the opening 35.

[0067] The radiation imaging system described in paragraph 1 includes an X-ray image generating unit 51 that generates an X-ray image of the subject M, and an optical image capturing unit 29 that captures an optical image of the subject M. The optical image capturing unit 29 includes a housing 33 having an opening 35, an optical lens 37, and a non-transparent shielding member 41. The optical lens 37 is disposed inside the housing 33 so as to face the opening 35.

[0068] The non-transparent shielding member 41 shields the optical lens 37 and is configured to be movable between a shielding position P1 and a retracted position P2 inside the housing 33. When the shielding member is moved to the shielding position P1, the shielding member 41 shields the optical lens 37 so that the optical lens 37 cannot be seen from outside the opening 35. In this case, since the shielding member 41 shields the optical lens 37, the optical lens 37 cannot be seen through the opening 35. Therefore, it is possible to prevent the subject M from feeling uneasy or suffering mental disadvantages due to the optical lens 37 being directed toward the subject M in a visible state.

[0069] On the other hand, when the shielding member 41 moves to the retracted position P2, the shielding member 41 does not shield the optical lens 37 of the imaging camera 36. In this case, the optical lens 37 becomes visible through the opening 35. That is, by moving the shielding member 41 to the retracted position P2, the imaging camera 36 can capture an optical image through the opening 35. Therefore, the optical lens 37 can be configured to be directed toward the subject M in a visible state only when it is necessary to capture an optical image. This prevents the subject M from feeling anxious that the optical lens 37 may actually be directed toward the subject M when the subject M is unaware that the optical lens 37 is actually being directed toward the subject M. Furthermore, if the optical lens 37 cannot be directed toward the subject M for religious reasons or other reasons, the shielding member 41 can be moved to the shielding position P1 to shield the optical lens 37 and capture an X-ray image, thereby preventing the subject M from suffering any psychological harm caused by the optical lens 37.

[0070] (Item 2) In the radiation imaging system described in item 1, the optical image capturing unit 29 is provided with a transparent protective member 39 that is disposed between the opening 35 and the optical lens 37 and protects the optical lens 37.

[0071] According to the radiation imaging system described in paragraph 2, the optical image capturing unit 29 is provided with a transparent protective member 39 that is disposed between the opening 35 and the optical lens 37 and protects the optical lens 37. In this case, even when the shielding member 41 is moved to the second position, the optical lens 37 is protected by the protective member 39. This more reliably prevents the optical lens 37 from being deteriorated by dust, condensation, or the like. Furthermore, because the protective member 39 is transparent, it is possible to prevent the light-gathering ability of the optical lens 37 from being reduced by the protective member 39 when capturing an optical image. This makes it possible to improve the accuracy of the optical image while avoiding deterioration of the optical lens 37.

[0072] (Item 3) The radiation imaging system described in item 1 further includes a collimator 27 that adjusts the irradiation field of the X-rays emitted from the X-ray tube 11, and the optical image capturing unit 29 is disposed on the collimator 27.

[0073] According to the radiation imaging system described in Section 3, the optical image capturing unit 29 is disposed on the collimator 27. The collimator 27 adjusts the irradiation field of X-rays irradiated from the X-ray tube 11. An optical image of the subject M captured using the optical image capturing unit 29 is generally used to determine the position of an appropriate X-ray irradiation field. Therefore, by disposing the optical image capturing unit 29 on the collimator 27, the range of the irradiation field of the optical image capturing unit 29 and the range of the X-ray irradiation field of the collimator 27 are positioned close to each other. Therefore, after capturing an optical image using the optical image capturing unit 29, the time required to adjust the position of the collimator 27 during X-ray imaging can be shortened.

[0074] (Item 4) In the radiation imaging system described in item 1, the shielding member 41 is configured to be manually displaced between the shielding position P1 and the retracted position P2.

[0075] According to the radiation imaging system described in Section 4, the operation of displacing the shielding member 41 between the shielding position P1 and the retracted position P2 is performed manually. In this case, the subject M can understand that in order to perform an operation to release the state in which the optical lens 37 is shielded by the shielding member 41, the operator must approach the optical image capturing unit 29 and manually move the shielding member 41. As a result, the shielding member 41 can be moved from the shielding position P1 to the retracted position P2 by electrical operation, for example, remote control, to enable optical images to be captured, thereby preventing the subject M from feeling anxious that an optical image of the subject M will be captured without the subject M's knowledge.

[0076] (5) The radiation imaging system described in 1 further includes a magnet 42a for fixing the shielding member 41 in the shielding position P1, and a magnet 42b for fixing the shielding member 41 in the retracted position P2.

[0077] According to the radiation imaging system described in Section 5, the shielding member 41 can be moved to the shielding position P1 and fixed therein by the magnet 42a. Furthermore, the shielding member 41 can be moved to the retracted position P2 and fixed therein by the magnet 42b. With this configuration, when it is necessary to shield the optical lens 37, the shielding member 41 can be reliably positioned at the shielding position P1. Therefore, it is possible to avoid a situation in which the shielding state of the shielding member 41 is released against the operator's intention. In other words, it is possible to reliably avoid a situation in which the optical lens 37 is directed toward the subject M against the operator's intention, thereby causing mental stress to the subject M.

[0078] Furthermore, when it is necessary to perform optical imaging by directing the optical lens 37 toward the subject M, the shielding member 41 can be reliably disposed at the retracted position P2. This makes it possible to avoid a situation in which the shielding member 41 moves from the retracted position P2 against the operator's intention and blocks the optical lens 37. In other words, it is possible to reliably avoid a situation in which the shielding member 41 prevents the operator from capturing an optical image against his or her intention.

[0079] (Item 6) In the radiation imaging system described in Item 5, the shielding member 41 is made of a magnetic material, the magnet 42a is a first magnet that fixes the shielding member 41 to the shielding position P1 by magnetic force, and the magnet 42b is a second magnet that fixes the shielding member 41 to the retracted position P2 by magnetic force.

[0080] According to the radiography system described in Section 6, the magnet 42a fixes the shielding member 41 at the shielding position P1 by its magnetic force. In this case, when the shielding member 41 approaches the magnet 42a, an attractive force caused by the magnetic force of the magnet 42a automatically acts on the shielding member 41, so that the shielding member 41 can be fixed at the shielding position P1 more easily and reliably. Furthermore, when the shielding member 41 is moved from the shielding position P1 to the retracted position P2, a driving force greater than the magnetic force of the magnet 42a is applied to the shielding member 41, so that the shielding member 41 can be easily retracted from the shielding position P1. Therefore, the operation of retracting the shielding member 41 from the shielding position P1 can be performed more quickly and easily.

[0081] Furthermore, the magnet 42b fixes the shielding member 41 at the retracted position P2 by its magnetic force. In this case, by bringing the shielding member 41 close to the magnet 42b, an attractive force caused by the magnetic force of the magnet 42b automatically acts on the shielding member 41, so that the shielding member 41 can be fixed at the retracted position P2 more easily and reliably. Furthermore, when moving the shielding member 41 from the retracted position P2 to the shielding position P1, the shielding member 41 can be easily retracted from the retracted position P2 by applying a driving force to the shielding member 41 that exceeds the magnetic force of the magnet 42b. Therefore, the operation of retracting the shielding member 41 from the retracted position P2 can be performed more quickly and easily.

[0082] (Item 7) The optical imaging device (29) according to this embodiment is an optical imaging device that is disposed in a radiation imaging system installed in an examination room R1 and captures optical images of a subject M, and comprises a housing 33, an opening 35 disposed in the housing 33, an optical lens 37 of an imaging camera 36 disposed inside the housing 33 so as to face the opening 35, and a non-transparent shielding member 41 configured to be movable between a shielding position P1 and a retracted position P2 inside the housing 33 and capable of shielding the optical lens 37, wherein when moved to the shielding position P1, the shielding member 41 shields the optical lens 37 so that the optical lens 37 cannot be seen from outside the opening 35, and when moved to the retracted position P2, the shielding member 41 is configured to enable the imaging camera 36 to capture an optical image through the opening 35, and is disposed in the examination room R1.

[0083] The optical image capturing device described in paragraph 7 includes a housing 33 having an opening 35, an optical lens 37, and a non-transparent shielding member 41. The optical lens 37 is disposed inside the housing 33 so as to face the opening 35.

[0084] The non-transparent shielding member 41 shields the optical lens 37 and is configured to be movable between a shielding position P1 and a retracted position P2 inside the housing 33. When the shielding member is moved to the shielding position P1, the shielding member 41 shields the optical lens 37 so that the optical lens 37 cannot be seen from outside the opening 35. In this case, since the shielding member 41 shields the optical lens 37, the optical lens 37 cannot be seen through the opening 35. Therefore, it is possible to prevent the subject M from feeling uneasy or suffering mental disadvantages due to the optical lens 37 being directed toward the subject M in a visible state.

[0085] On the other hand, when the shielding member 41 moves to the retracted position P2, the shielding member 41 does not shield the optical lens 37 of the imaging camera 36. In this case, the optical lens 37 becomes visible through the opening 35. That is, by moving the shielding member 41 to the retracted position P2, the imaging camera 36 can capture an optical image through the opening 35. Therefore, the optical lens 37 can be configured to be directed toward the subject M in a visible state only when it is necessary to capture an optical image. This prevents the subject M from feeling anxious that the optical lens 37 may actually be directed toward the subject M when the subject M is unaware that the optical lens 37 is actually being directed toward the subject M. Furthermore, if the optical lens 37 cannot be directed toward the subject M for religious reasons or other reasons, the shielding member 41 can be moved to the shielding position P1 to shield the optical lens 37 and capture an X-ray image, thereby preventing the subject M from suffering any psychological harm caused by the optical lens 37.

[0086] <Other Embodiments> The embodiments disclosed herein are illustrative in all respects and are not limiting. The scope of the present invention includes the claims and all modifications within the meaning and scope of the claims. For example, the present invention can be modified as follows.

[0087] (1) In the above-described X-ray imaging system, the configuration for fixing the shielding member 41 at the shielding position P1 is not limited to the magnet 42a. That is, the configuration for fixing the position of the shielding member 41 is not limited to using magnetic force, and a mechanical member may be used to fix the position of the shielding member 41 at the shielding position P1. A specific example is a configuration in which the shielding member 41 is fixed at the shielding position P1 by holding the shielding member 41 using a manipulator or the like that grips the shielding member 41. Alternatively, the shielding member 41 may be fixed at the shielding position P1 using a member that locks the shielding member 41 or a member that fits into the shielding member 41. Similarly, the configuration for fixing the shielding member 41 at the retracted position P2 is not limited to the magnet 42b, and a mechanical member may be used to fix the position of the shielding member 41 at the retracted position P2.

[0088] (2) In the X-ray imaging system described above, the shielding member 41 is not limited to being manually moved from the shielding position P1 to the retracted position P2. For example, the shielding member 41 may be electrically moved. As shown in FIG. 11 , the X-ray imaging system 1A according to this modification includes a shielding member driver 61 and a drive controller 63. The shielding member driver 61 applies a driving force required to move the shielding member 41 between the shielding position P1 and the retracted position P2. An example of the shielding member driver 61 is a motor. The drive controller 63 is provided in the main controller 43 and controls the operation of the shielding member driver 61. In the X-ray imaging system 1A according to this modification, the operator does not need to approach the optical image capture unit 29 each time the shielding member 41 is moved. This reduces the burden on the operator caused by the operation of moving the shielding member 41.

[0089] (3) In the above-described X-ray imaging system, an example has been described in which optical images and X-ray images are captured for a subject M in a supine position as shown in FIG. 1 . However, this is not limiting. That is, as shown in FIG. 12 , a configuration may be used in which optical images and X-ray images are captured for a subject M in a standing position. An X-ray imaging system 1B according to this modification includes an imaging stand 65. The imaging stand 65 supports the subject M in a standing position. The imaging stand 65 incorporates an X-ray detector 9. In this modification, the opening 35 of the optical image capturing unit 29 and the opening 31 of the collimator 27 are arranged to face the left side of the X-ray generation unit 3. That is, the X-ray tube 11 is configured to irradiate X-rays horizontally onto the subject M in a standing position. The X-ray imaging system 1 may also include both the tabletop 7 shown in FIG. 1 and the imaging stand 65 shown in FIG. 12 .

[0090] (4) In the above-described X-ray imaging system, the optical image capturing unit 29 is not limited to being disposed in the collimator 27. That is, other examples of locations where the optical image capturing unit 29 may be disposed include the ceiling T of the examination room R1.

[0091] DESCRIPTION OF SYMBOLS 1 ... X-ray imaging system 3 ... X-ray generation unit 5 ... Support mechanism 7 ... Top plate 9 ... X-ray detector 11 ... X-ray tube 13 ... Operation handle 15 ... Rail 17 ... Ceiling running unit 19 ... Rail 21 ... Guide unit 23 ... Support 24 ... Rotation holding unit 27 ... Collimator 29 ... Optical image capturing unit 33 ... Housing 35 ... Opening 36 ... Photography camera 37 ... Optical lens 39 ... Protective member 41 ... Shielding member 42a ... Magnet 42b ... Magnet 43 ... Main control unit 45 ... Display unit 47 ... Input unit 48 ... Memory unit 49 ... X-ray tube control unit 51 ... X-ray image generating unit 53 ... Camera control unit 55 ... Optical image generating unit 61 ... Shielding member driving unit 63 ... Drive control unit 65 ... Imaging stand P1 ... Shielding position P2 ... Retracted position L ... Light

Claims

1. A radiography system installed in an examination room, comprising: a radiation source which irradiates a subject with radiation; a radiation detector which detects radiation which has passed through the subject; a radiography image generating section which generates a radiography image of the subject using a detection signal output by the radiation detector; and an optical image capturing section which is disposed in the examination room and captures an optical image of the subject, wherein the optical image capturing section comprises: a housing; an opening disposed in the housing; an optical lens of an imaging camera which is disposed inside the housing so as to face the opening; and a non-transparent shielding member which is configured to be movable between a first position and a second position inside the housing and capable of shielding the optical lens, wherein the shielding member is configured to shield the optical lens so that the optical lens cannot be seen from outside the opening when moved to the first position, and to allow the imaging camera to capture the optical image through the opening when moved to the second position.

2. A radiation imaging system according to claim 1, wherein the optical image capturing unit is provided with a transparent protective member disposed between the opening and the optical lens for protecting the optical lens.

3. A radiation imaging system according to claim 1, further comprising a collimator for adjusting the irradiation field of the radiation emitted from the radiation source, and the optical image capturing unit is disposed on the collimator.

4. A radiation imaging system according to claim 1, wherein the shielding member is configured to be manually displaced between the first position and the second position.

5. A radiation imaging system as described in claim 1, comprising: a first fixing member for fixing the shielding member in the first position after being moved thereto; and a second fixing member for fixing the shielding member in the second position after being moved thereto.

6. A radiation imaging system as described in claim 5, wherein the shielding member is made of a magnetic material, the first fixing member is a first magnet that fixes the shielding member to the first position by magnetic force, and the second fixing member is a second magnet that fixes the shielding member to the second position by magnetic force.

7. An optical imaging device disposed in a radiation imaging system installed in an examination room and configured to capture optical images of a subject, the optical imaging device comprising: a housing; an opening disposed in the housing; an optical lens of an imaging camera disposed inside the housing so as to face the opening; and a non-transparent shielding member configured to be movable between a first position and a second position inside the housing and capable of shielding the optical lens, the shielding member being configured to shield the optical lens so that the optical lens cannot be seen from outside the opening when moved to the first position, and to enable the imaging camera to capture the optical image through the opening when moved to the second position; the optical imaging device disposed in the examination room.

Images