JP2018042892A - Medical diagnostic imaging equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical image diagnostic apparatus capable of improving comfort in a bore of a gantry. A medical image diagnostic apparatus includes a pedestal, a moving body 61, a screen 63, a reflector 67, and a frame 65. The gantry has a bore and is equipped with a medical imaging mechanism. The moving body 61 can move in the bore along the central axis of the bore. The screen 63 is provided on the moving body 61, and the image from the projector is projected from the side opposite to the side where the top plate is inserted into the bore. The reflector 67 reflects the image projected on the screen 63. The frame 65 is provided on the moving body 61 and supports the reflector 67. The connection point between the frame 63 and the moving body 61 is located on the projector side with respect to the screen 63 in a state where the subject placed on the top plate can visually recognize the image through the reflector 67. [Selection diagram] FIG. 25

Description

  Embodiments described herein relate generally to a medical image diagnostic apparatus.

  The magnetic resonance imaging apparatus has a gantry equipped with an imaging mechanism such as a magnet. A substantially hollow bore is formed on the gantry. MR (Magnetic Resonance) imaging is performed with the patient inserted into the bore. Although a gantry with a relatively large bore diameter has been developed, there are many patients who feel stress in MR examination due to long MR imaging time, noise during gantry driving, feeling of pressure and obstruction in the bore. .

Japanese Patent Application No. 2015-214741

  An object of the embodiment is to provide a medical image diagnostic apparatus capable of improving the comfortability in the bore of the gantry.

  The medical image diagnostic apparatus according to the present embodiment includes a gantry, a moving body, a screen, a reflecting plate, and a frame. The gantry has a bore and is equipped with a medical imaging mechanism. The movable body is movable in the bore along the central axis of the bore. The screen is provided on the moving body, and an image from the projector is projected from a side opposite to a side where the top plate is inserted into the bore. The reflector reflects the image projected on the screen. The frame is provided on the movable body and supports the reflector. The connection point between the frame and the moving body is located on the projector side with respect to the screen in a state where a subject placed on the top plate can visually recognize the image through the reflection plate.

FIG. 1 is a diagram illustrating a configuration of a medical image diagnostic system including a medical image diagnostic apparatus according to the first embodiment. FIG. 2 is a diagram illustrating a configuration of the magnetic resonance imaging apparatus according to the first embodiment. FIG. 3 is a diagram illustrating an example of an installation environment of the magnetic resonance imaging system according to the first embodiment. FIG. 4 is a perspective view of the mobile screen device according to the first embodiment. FIG. 5 is a side view of the mobile screen device of FIG. 6 is a front view of the mobile screen device of FIG. FIG. 7 is a perspective view of the connected movable screen device and the top plate according to the first embodiment. FIG. 8 is a diagram illustrating a state in which the first support part is movable along the central axis and the second support part is movable in the outer shape direction according to the first embodiment. FIG. 9 is a diagram illustrating an example of a vibration damper provided between the first support portion and the moving body according to the first embodiment. FIG. 10 is a diagram illustrating an example of a vibration damper provided between the second support portion and the reflection plate according to the first embodiment. FIG. 11 is a diagram illustrating an example of an optical path when the reflecting plate is a prism mirror according to the first embodiment. FIG. 12 is a diagram illustrating an optical path when the reflecting plate is a normal mirror according to the first embodiment. FIG. 13 is a diagram illustrating an example of an optical path of a reflector having a Fresnel structure in addition to the prism mirror according to the first embodiment. FIG. 14 is a diagram illustrating a side surface of the mobile screen device according to the first application example of the first embodiment. FIG. 15 is a side view showing a side surface of the mobile screen device according to the second application example of the first embodiment. FIG. 16 relates to a second application example of the first embodiment, and in a state where the movable screen device is arranged outside the bore on the projector side, the movable body contracted along the central axis and the second support. The part is shown. FIG. 17 relates to a second application example of the first embodiment, and in a state where the movable screen device is disposed outside the bore, the second support portion is connected to the first support portion and the second support portion. It shows a state where the part is folded toward the screen with the rotation axis as a rotation axis. FIG. 18 is a perspective view of a movable screen device according to the second embodiment. FIG. 19 is a side view showing a side surface of the mobile screen device according to the second embodiment. FIG. 20 is a view of the mobile screen device according to the second embodiment viewed from the projector side. FIG. 21 is a side view showing a side surface of the mobile screen device according to the third embodiment. FIG. 22 is a view of the mobile screen device according to the third embodiment as viewed from the projector side. FIG. 23 is a diagram illustrating a front view of the mobile screen device according to the fourth embodiment together with the front view of the mobile screen device according to the first to third embodiments. FIG. 24 is a top view of the mobile screen device according to the fourth embodiment and the mobile screen device according to the first to third embodiments, as viewed from the top surface of the top plate. FIG. 25 is a perspective view of a mobile screen device according to the fourth embodiment.

  As a technique for reducing stress in the MR examination, for example, there is a head coil to which a mirror for viewing an image of a liquid crystal monitor arranged behind the gantry is attached. On the other hand, in a magnetic resonance imaging (hereinafter referred to as MRI) apparatus, the bore diameter may be reduced to obtain better imaging performance, and the patient space may be reduced. At this time, MR imaging in a small-bore bore has a problem that stress is great for the subject.

  The medical image diagnostic apparatus according to this embodiment will be described below with reference to the drawings. In the following description, components having substantially the same function and configuration are denoted by the same reference numerals, and redundant description will be given when necessary.

(First embodiment)
FIG. 1 is a diagram showing a configuration of a medical image diagnostic system 1 including a medical image diagnostic apparatus 10 according to the present embodiment. As shown in FIG. 1, the medical image diagnostic system 1 includes a medical image diagnostic apparatus 10, a projector 100, and a projector control apparatus 200 that are connected to each other so as to be able to communicate with each other by wire or wirelessly. The medical image diagnostic apparatus 10 includes a gantry 11, a bed 13, a movable screen device 15, and an imaging control unit 17. For example, the gantry 11, the bed 13, and the movable screen device 15 are installed in an examination room, and the imaging control unit 17 is installed in a control room adjacent to the examination room. The gantry 11 is equipped with a mechanism for realizing medical imaging. The gantry 11 is formed with a hollow bore. A bed 13 is installed in front of the gantry 11. The bed 13 movably supports a top plate on which the subject P is placed. The bed 13 moves the top board according to the control by the gantry 11 and the console. A movable screen device 15 is movably provided in the bore of the gantry 11. A projector 100 is installed in front of or behind the gantry 11. An image from the projector 100 is projected onto the mobile screen device 15.

  The projector control device 200 is a computer device that controls the projector 100. The projector control device 200 supplies data related to the projection target video to the projector 100. The projector 100 projects an image corresponding to the data from the projector control device 200 onto the screen of the mobile screen device 15. The projector 100 includes at least a display device and a light source. The display device displays an image corresponding to the data from the projector control device 200. The light source irradiates the display device with light directly or indirectly through an optical system. Light transmitted or reflected from the display device (hereinafter referred to as projection light) is emitted to the outside of the projector 100 directly or indirectly through an optical system. By irradiating the mobile screen device 15 with the projection light, an image corresponding to the projection light is displayed on the mobile screen device 15.

  The imaging control unit 17 functions as the center of the medical image diagnostic apparatus 10. For example, the imaging control unit 17 controls the gantry 11 to perform medical imaging. Further, the imaging control unit 17 reconstructs a medical image related to the subject P based on the raw data collected by the gantry 11 in medical imaging. Note that the imaging control unit 17 may be configured to be able to control the projector 100 via the projector control device 200. The configuration of the medical image diagnostic system 1 in the present embodiment is not limited to the above.

  The medical image diagnostic system 1 according to the present embodiment uses the projector 100 and the movable screen device 15 to improve the comfortability in the bore during medical imaging by the medical image diagnostic device 10. The medical image diagnostic apparatus 10 according to the present embodiment may be any apparatus that can image the subject P using the gantry 11 in which the bore is formed. Specifically, as the medical image diagnostic apparatus 10 according to the present embodiment, an MRI apparatus, an X-ray computed tomography (CT) apparatus, a PET (Positron Emission Tomography) apparatus, and a SPECT (Single Photon Emitted Computated Tomography). It is applicable to a single modality such as a device. Alternatively, the medical image diagnostic apparatus 10 according to the present embodiment may be applied to a composite modality such as an MR / PET apparatus, a CT / PET apparatus, an MR / SPECT apparatus, and a CT / SPECT apparatus. However, in order to specifically describe the following, it is assumed that the medical image diagnostic apparatus 10 according to the present embodiment is a magnetic resonance imaging apparatus 10. Further, the medical image diagnostic system 1 including the magnetic resonance imaging apparatus 10, the projector 100, and the projector control apparatus 200 will be referred to as a magnetic resonance imaging system 1.

  FIG. 2 is a diagram showing a configuration of the magnetic resonance imaging apparatus 10 according to the present embodiment. As shown in FIG. 2, the magnetic resonance imaging apparatus 10 includes an imaging control unit 17, a gantry 11, a bed 13, and a movable screen device 15. The imaging control unit 17 includes a gradient magnetic field power source 21, a transmission circuit 23, a reception circuit 25, and a console 27. The console 27 includes an imaging control circuit 31, a reconstruction circuit 32, an image processing circuit 33, a communication circuit 34, a display circuit 35, an input circuit 36, a main storage circuit 37, and a system control circuit 38. The imaging control circuit 31, the reconstruction circuit 32, the image processing circuit 33, the communication circuit 34, the display circuit 35, the input circuit 36, the main memory circuit 37, and the system control circuit 38 are communicably connected to each other via a bus. . The gradient magnetic field power source 21, the transmission circuit 23, and the reception circuit 25 are provided separately from the console 27 and the gantry 11.

  The gantry 11 includes a static magnetic field magnet 41, a gradient magnetic field coil 43, and an RF coil 45. The static magnetic field magnet 41 and the gradient magnetic field coil 43 are accommodated in a casing 51 (hereinafter referred to as a pedestal casing) 51 of the gantry 11. The gantry casing 51 is formed with a bore 53 having a hollow shape. An RF coil 45 is disposed in the bore 53 of the gantry casing 51. In addition, the mobile screen device 15 according to the present embodiment is disposed in the bore 53 of the gantry casing 51.

  The static magnetic field magnet 41, the gradient magnetic field coil 43, the RF coil 45, and the like correspond to a medical imaging mechanism. When the medical image diagnostic apparatus 10 has various modalities such as a CT apparatus, a PET apparatus, a SPECT apparatus, a CT / PET apparatus, an MR / PET apparatus, an MR / SPECT apparatus, and a CT / SPECT apparatus, the medical imaging mechanism It corresponds to a set of various imaging devices equipped on a frame in the modality.

  The static magnetic field magnet 41 has a hollow, substantially cylindrical shape, and generates a static magnetic field inside the substantially cylindrical shape. As the static magnetic field magnet 41, for example, a permanent magnet, a superconducting magnet, a normal conducting magnet, or the like is used. Here, the central axis of the static magnetic field magnet 41 is defined as the Z axis, the axis perpendicular to the Z axis is called the Y axis, and the axis horizontally orthogonal to the Z axis is called the X axis. The X axis, the Y axis, and the Z axis constitute an orthogonal three-dimensional coordinate system.

  The gradient magnetic field coil 43 is a coil unit that is attached to the inside of the static magnetic field magnet 41 and is formed in a hollow substantially cylindrical shape. The gradient coil 43 receives a current supplied from the gradient magnetic field power supply 21 and generates a gradient magnetic field.

  The gradient magnetic field power supply 21 supplies a current to the gradient magnetic field coil 43 in accordance with control by the imaging control circuit 31. The gradient magnetic field power supply 21 generates a gradient magnetic field in the gradient magnetic field coil 43 by supplying a current to the gradient magnetic field coil 43.

  The RF coil 45 is disposed inside the gradient magnetic field coil 43 and receives a supply of RF pulses from the transmission circuit 23 to generate a high frequency magnetic field. The RF coil 45 receives a magnetic resonance signal (hereinafter referred to as an MR signal) emitted from a target nucleus existing in the subject P under the action of a high-frequency magnetic field. The received MR signal is supplied to the receiving circuit 25 via wired or wireless. Although the above-described RF coil 45 is a coil having a transmission / reception function, a transmission RF coil and a reception RF coil may be provided separately.

  The transmission circuit 23 transmits a high-frequency magnetic field for exciting target nuclei such as protons existing in the subject P to the subject P via the RF coil 45. Specifically, the transmission circuit 23 supplies a high-frequency signal (RF signal) for exciting the target atomic nucleus to the RF coil 45 according to control by the imaging control circuit 31. The high-frequency magnetic field generated from the RF coil 45 vibrates at a resonance frequency unique to the target nucleus, and excites the target nucleus. MR signals are generated from the excited target nuclei and detected by the RF coil 45. The detected MR signal is supplied to the receiving circuit 25.

  The receiving circuit 25 receives the MR signal generated from the excited target nucleus via the RF coil 45. The receiving circuit 25 processes the received MR signal to generate a digital MR signal. The digital MR signal is supplied to the reconstruction circuit 32 via a wire or wirelessly.

  A bed 13 is installed adjacent to the gantry 11. The bed 13 includes a top board 131 and a base 133. A subject P is placed on the top 131. The base 133 supports the top plate 131 so as to be slidable along the X axis, the Y axis, and the Z axis. A bed driving device 135 is accommodated in the base 133. The couch driving device 135 moves the table 131 under the control of the imaging control circuit 31. As the bed driving device 135, for example, any motor such as a servo motor or a stepping motor may be used.

  The imaging control circuit 31 includes, as hardware resources, a CPU (Central Processing Unit) or MPU (Micro Processing Unit) processor and a memory such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The imaging control circuit 31 synchronously controls the gradient magnetic field power source 21, the transmission circuit 23, and the reception circuit 25 based on the pulse sequence information supplied from the system control circuit 38, and performs a pulse sequence according to the pulse sequence information. The subject P is imaged.

  The reconfiguration circuit 32 includes, as hardware resources, a processor such as a CPU, a GPU (Graphical processing unit), and an MPU, and a memory such as a ROM and a RAM. The reconstruction circuit 32 reconstructs an MR image related to the subject P based on the MR signal from the reception circuit 25. For example, the reconstruction circuit 32 generates an MR image defined in the real space by performing a Fourier transform or the like on the MR signal arranged in the k space or the frequency space. Note that the reconfiguration circuit 32 includes an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), and other complex programmable logic devices (FPGA) that realize a reconfiguration function. It may be realized by a complex programmable logic device (CPLD) or a simple programmable logic device (SPLD).

  The image processing circuit 33 includes, as hardware resources, a processor such as a CPU, GPU, or MPU and a memory such as a ROM or RAM. The image processing circuit 33 performs various image processing on the MR image reconstructed by the reconstruction circuit 32. The image processing circuit 33 may be realized by an ASIC, FPGA, CPLD, or SPLD that realizes the image processing function.

  The communication circuit 34 performs data communication with the projector control device 200 or the projector 100 via a wire or wireless (not shown). The communication circuit 34 may perform data communication with an external device such as a PACS server connected via a network (not shown). Further, the communication circuit 34 may perform data communication with a device described later attached to the mobile screen device 15.

  The display circuit 35 displays various information. For example, the display circuit 35 displays the MR image reconstructed by the reconstruction circuit 32 and the MR image subjected to image processing by the image processing circuit 33. The display circuit 35 may display an image projected by the projector 100.

  Specifically, the input circuit 36 includes an input device and an input interface circuit. The input device accepts various commands from the user. As an input device, a keyboard, a mouse, various switches, and the like can be used. The input interface circuit supplies an output signal from the input device to the system control circuit 38 via the bus. Note that the input circuit 36 is not limited to one having physical operation parts such as a mouse and a keyboard. For example, an electrical signal processing circuit that receives an electrical signal corresponding to an input operation from an external input device provided separately from the magnetic resonance imaging apparatus 10 and outputs the received electrical signal to various circuits is also input. An example of circuit 36 is included.

  The main memory circuit 37 is a storage device such as a hard disk drive (HDD), a solid state drive (SSD), or an integrated circuit storage device that stores various information. Further, the main storage circuit 37 may be a drive unit that reads / writes various information from / to a portable storage medium such as a CD-ROM drive, a DVD drive, or a flash memory. For example, the main memory circuit 37 stores an MR image, a control program for the magnetic resonance imaging apparatus 10, and the like.

  The system control circuit 38 includes a CPU or MPU processor and a memory such as a ROM or a RAM as hardware resources. The system control circuit 38 functions as the center of the magnetic resonance imaging apparatus 10. Specifically, the system control circuit 38 reads out the control program stored in the main storage circuit 37 and develops it on the memory, and controls each part of the magnetic resonance imaging apparatus 10 according to the developed control program.

  Hereinafter, the magnetic resonance imaging apparatus 10 of the present embodiment will be described in detail.

  First, an installation environment of the magnetic resonance imaging system 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of an installation environment of the magnetic resonance imaging system according to the present embodiment. As shown in FIG. 3, an examination room 300 where MR imaging is performed and a control room 400 adjacent to the examination room 300 are provided. The examination room 300 is provided with a gantry 11 and a bed 13. A bed 13 is provided in front of the gantry 11. A movable screen device 15 is provided in the bore of the gantry 11. The examination room 300 is a shield room that can shield a leakage magnetic field from the gantry 11 and an electromagnetic field from the outside. The examination room 300 is provided with a door D1 for entering and leaving the room. In addition, a door D <b> 2 is provided between the examination room 300 and the control room 400 for traveling between the examination room 300 and the control room 400. In the control room 400, a console 27, a projector 100, and a projector control device 200 are installed. The projector 100 is installed behind the gantry 11 with a wall 500 between the examination room 300 and the control room 400 interposed therebetween. A portion of the wall 500 where the projection light LP traveling from the projector 100 to the movable screen device 15 propagates is provided with a window 510 through which the projection light LP can be transmitted. Through the window 510, the projection light LP can be propagated from the projector 100 installed in the control room 400 to the mobile screen device 15 in the examination room 300. The control room 400 may be provided with a door D3 for entering and leaving the room.

  The above layout is an example, and the present invention is not limited to this. For example, the projector 100, the projector control device 200, and the console 27 are installed in the control room 400. However, the console 27 and the projector control device 200 may be installed in a different room from the projector 100. Further, the projector 100 may be provided in the examination room 300 as long as the projector 100 can be formed of a material that is not affected by the magnetic field. In addition to the inspection room 300 and the control room 400, a machine room or the like for installing the gradient magnetic field power source 21 and the receiving circuit 25 may be provided.

  A hollow bore 53 is formed in the gantry casing 51. A rail 55 parallel to the central axis Z of the bore 53 is formed below the bore 53 of the gantry casing 51. The rail 55 is a structure that guides the slide along the central axis Z between the top plate 131 and the movable screen device 15. The rail 55 is provided on the inner wall 57 of the gantry casing 51 in contact with the bore 53. The rail 55 is formed of a nonmagnetic material that does not act on a magnetic field used for magnetic resonance imaging. Here, the direction from the bed side to the projector side with respect to the Z axis is defined as the + Z axis direction, and the direction from the projector side to the bed side is defined as the −Z axis direction.

  Next, the structure of the movable screen device 15 will be described with reference to FIGS. FIG. 4 is a perspective view of the movable screen device 15 according to the present embodiment. FIG. 5 is a side view of the mobile screen device 15. FIG. 6 is a front view of the mobile screen device 15. FIG. 7 is a perspective view of the movable screen device 15 and the top plate 131 adjacent to each other.

  As shown in FIGS. 4 to 7, the movable screen device 15 includes a moving body 61, a screen 63, a frame 65, and a reflection plate 67. The moving body 61 is a structure (moving carriage) that moves along the rail 55 provided on the inner wall 57 of the gantry casing 51. A wheel (not shown) that rolls on the rail 55 is attached to the lower portion of the moving body 61 in order to improve the traveling performance of the rail 55. In addition, as long as the moving body 61 can travel on the rail 55, it is not always necessary to provide wheels, and the surface that contacts the rail 55 may be formed of a material having a low friction coefficient. Further, instead of the rail 55 and the wheel, a guide such as a linear motion bearing may be provided. With these configurations, the moving body 61 can move in the bore along the central axis Z of the bore 53. The moving body 61 supports the screen 63 and the frame 65. The moving body 61 is formed of a nonmagnetic material that does not act on a magnetic field such as resin.

  As shown in FIG. 7, for example, the moving body 61 and the top plate 131 may be adjacent to each other. At this time, the moving body 61 can move in the bore along the center axis Z of the bore 53 together with the top plate 131. A subject fixture 137 is attached to the front part (+ Z-axis direction side) of the top 131. The subject fixing tool 137 fixes the head of the subject P placed on the top board 131. The subject fixture 137 has a curved shape so as to cover the back of the head without obstructing the field of view of the subject P placed on the tabletop 131 in a supine position. That is, the frontal side of the subject fixture 137 is open.

  As shown in FIGS. 4 to 7, the screen 63 is provided on the moving body 61. The image from the projector 100 is projected onto the screen 63 from the side opposite to the insertion side of the top plate 131 to the bore 53. That is, the projector 100 is arranged on the opposite side of the bed 13 with the screen 63 interposed therebetween. Here, the surface of the screen 63 on the projector 100 side is referred to as the back surface, and the surface on the bed 13 side is referred to as the front surface. In order to display an image on the surface, the screen 63 is preferably formed of a translucent material. As such a translucent material, translucent plastic or frosted glass may be used. By forming the screen 63 from a translucent material, the projection light emitted from the projector 100 is irradiated on the back surface of the screen, and an image corresponding to the projection light is projected on the surface. As a result, the subject P or the like can see the image projected on the surface from the bed 13 side through the reflection plate 67. The screen 63 may be a model having a planar shape or a model having a curved shape. When it has a curved surface shape, the concave surface is preferably arranged so as to face the bed 13 side, that is, form a surface. When the concave surface is directed to the bed 13 side, the rear periphery of the head of the subject P placed on the top board 131 can be covered with the screen 63. As a result, the field of view of the subject P can be filled with the video image projected on the screen 63 and immersed in the video image.

  As shown in FIG. 6, the frame 65 has an outer diameter RS that is smaller than the diameter RB of the inner wall 57 that contacts the bore 53 of the gantry housing 51. Thus, the movable screen device 15 can be inserted into the bore 53 by designing the outer diameter RS to be smaller than the inner diameter RB. In the bore 53, wind flows from a ventilation fan (not shown) provided on the gantry 11. By providing the gap G <b> 1 between the edge of the screen 63 and the inner wall 57, it is possible to prevent the wind sent from the ventilation fan from being blocked by the screen 63.

  As shown in FIGS. 4, 5, and 7, at the two connection points 66 between the frame 65 and the moving body 61, the subject P placed on the top plate 131 can visually recognize the image through the reflection plate 67. In this state, it is located on the projector side with respect to the screen 63. The connection portion 66 between the frame 65 and the moving body 61 is provided at a position where the moving body 61 does not block the image projected on the screen 63 from the projector 100. The frame 65 has a first support part 651 and a second support part 653.

  The frame 65 is provided on the moving body 61 so as to be movable along the central axis Z. In addition to the above, the frame 65 may be provided on the moving body 61 so that the second support portion 653 can be moved in the outer direction along the outer shape of the first support portion 651. FIG. 8 is a diagram illustrating a state in which the first support portion 651 is movable along the central axis Z, and a state in which the second support portion 653 is movable along the outer shape direction. The first support part 651 and the second support part 653 will be described in detail later. At least one of the first support part 651 and the second support part 653 may be made of a transparent material. More preferably, the frame 65 is made of a transparent material. Thereby, the feeling of pressure to the subject P by the frame 65 can be reduced.

  Note that the surface of the first support portion 651 facing the moving body 61, that is, the inner surface of the first support portion 651 (hereinafter referred to as the inner surface) is projected on the surface of the projection light LP emitted from the projector 100. A diffusing structure for diffusing the reached projection light may be provided. The diffusion structure is, for example, a coating process that forms a fine uneven surface, a surface treatment (blasting treatment) such as sandblasting, or various diffusers (diffusers).

  A vibration damper that suppresses the vibration of the reflection plate 67 due to the vibration of the moving body 61 may be provided between the first support portion 651 of the frame 65 and the moving body 61. FIG. 9 is a diagram illustrating an example of a vibration damper 68 provided between the first support portion 651 and the moving body 61. The vibration damper 68 is, for example, various dampers made of a nonmagnetic material, a shock absorber, or the like. As a result, as shown in FIG. 9, even if the moving body 61 inserted into the bore vibrates, the vibration of the reflector 67 is suppressed by the vibration damper 68, and the subject P can be immersed by the image. .

  As shown in FIGS. 4, 5, and 7, the first support portion 651 is connected to the moving body 61 at the connection point 66 and is disposed on the projector side with respect to the screen 63. At this time, the position of the first support portion 651 is a position outside the field of view of the subject P placed on the top 131. The first support portion 651 has, for example, a shape that is curved along the inner wall 57 of the bore 53. The shape of the first support portion 651 is not limited to the arc as long as it does not block the image projected from the projector 100 to the screen 63.

  As shown in FIG. 8, the first support portion 651 may be supported by the moving body 61 so as to be movable toward the projector along the central axis Z of the bore 53. At this time, for example, a linear bearing is provided at the end of the first support portion 651, that is, at the connection portion 66. The moving body 61 is provided with a guide rail (not shown) that guides a linear motion bearing provided at the end of the first support portion 651 along the central axis Z between the screen 63 and the projector 100. The Thereby, the position of the reflecting plate 67 can be adjusted along the central axis Z.

  As shown in FIGS. 4 to 7, the second support portion 653 supports the reflection plate 67 beyond the screen 63 from the first support portion 651. For example, the second support portion 653 supports the reflector 67 across the screen 63 by passing the gap between the outer edge of the screen 63 above the midpoint between the upper and lower ends of the screen 63 and the inner wall 57 of the bore 53. To do. In other words, the second support portion 653 extends from the first support portion 651 through a gap between the outer edge of the screen 63 above the midpoint between the upper end and the lower end of the screen 63 and the inner wall 57 of the bore 53 to reflect the reflection. The plate 67 is supported. Specifically, the second support portion 653 is located above the midpoint between the upper end and the lower end of the screen 63 in the gap between the inner wall 57 of the bore 53 and the screen 63 and is parallel to the Y axis. Are formed by two arms parallel to the central axis Z of the bore 53. The second support portion 653 supports the reflecting plate 67 by these two arms so as to be rotatable about the X axis as a rotation axis. At this time, the cross-sectional shape of each of the two arms has a curved shape along the inner wall 57 of the bore 53, for example. Thereby, the angle of the reflecting plate 67 can be adjusted with the X axis as the rotation axis.

  The second support portion 653 may be supported by the first support portion 651 so as to be movable toward the projector along the central axis Z of the bore 53. At this time, for example, a linear motion bearing is provided in the connection portion 70 between the second support portion 653 and the first support portion 651. The second support portion 653 is provided with a guide rail that guides the linear motion bearing along the central axis Z of the bore 53. At this time, the linear motion bearing and the guide rail that guides the linear motion bearing are made of a nonmagnetic material.

  Note that the structure of the second support portion 653 is not limited to the structure shown in FIGS. For example, the second support portion 653 extends from the upper end of the first support portion 651 along the central axis Z of the bore 53 over the screen 63 to a position just above the subject fixture 137 on the top 131. There may be one arm. At this time, for example, the arm as the second support portion 653 extends from the position of the uppermost end of the first support portion 651 to the position directly above the top plate 131 beyond the screen 63. The connecting portion 70 between the first support portion 651 and the second support portion 653 is not limited to the position of the uppermost end of the first support portion 651.

  Moreover, the 2nd support part 653 may be supported by the 1st support part 651 so that it can move to the at least one connection location 66 from the upper end of the 1st support part 651, as shown in FIG. At this time, a nonmagnetic guide rail for guiding the linear motion bearing is provided from the upper end of the first support portion 651 to at least one connection point 66 on the side surface of the first support portion 651 facing the inner wall 57 of the bore 53. It is done. Thereby, the position of the reflecting plate 67 can be adjusted along the Y axis perpendicular to the top plate 131. When the second support portion 653 has two arms and each of the two arms is moved to the nearest connection point 66, the arm that supports the reflection plate 67 has a structure that can expand and contract in the X-axis direction. The reflecting plate 67 moves along the central axis Z, moves along the direction perpendicular to the top plate 131 (for example, the Y-axis direction), and a direction orthogonal to the direction perpendicular to the central axis (for example, X The shaft 65 may be supported by the frame 65 so that at least one of the rotations about the rotation axis can be realized.

  Note that a vibration damper that suppresses the vibration of the reflection plate 67 due to the vibration of the moving body 61 may be provided between the second support portion 653 and the reflection plate 67. FIG. 10 is a diagram illustrating an example of a vibration damper 72 provided between the second support portion 653 and the reflection plate 67. As shown in FIG. 10, even if the moving body 61 inserted into the bore vibrates, the vibration of the reflector 67 is suppressed by the vibration damper 72, and the subject P can be immersed by the image.

  In a state where the moving body 61 and the top plate 131 are connected, the reflecting plate 67 is separated from the surface of the moving body 61 so as not to hit the head of the subject P placed on the top plate 131. The second support portion 653 of the frame 65 is supported. As shown in FIGS. 4 to 7, the reflection plate 67 is provided at a substantially end portion of the second support portion 653. The reflection plate 67 reflects the image displayed on the surface of the screen 63. The reflection plate 67 is made of a nonmagnetic material and may be made of any material as long as it can optically reflect the object. For example, as the reflector 67, a mirror obtained by performing aluminum vapor deposition on acrylic, a half mirror obtained by attaching a dielectric film, or the like may be used. The subject P with the head placed on the subject fixture 137 can see the image projected on the surface via the reflector 67.

  The reflection plate 67 is rotatably provided on the second support portion 653 in order to manually adjust the angle of the reflection plate 67. Specifically, as shown in FIG. 5, the rotation mechanism (not shown) provided in the second support portion 653 is provided to be rotatable around the rotation axis RR1. For example, the rotation axis RR1 is provided in parallel to the X axis so that the orientation of the reflection plate 67 with respect to the surface of the screen 63 can be adjusted. More specifically, the second support portion 653 is provided so as to be switchable between at least a first angle for a first projection format described later and a second angle for a second projection format. And good. The first projection format is a format in which the subject P views the video on the screen 63 from outside the gantry 11 without passing through the reflector 67. For this reason, the first angle of the reflector 67 in the first projection format is preferably set to an angle that does not block the field of view of the subject P or the like outside the gantry 11, for example, substantially horizontal. At this time, the second support portion 653 is moved to the projector side along the central axis Z, or moved to the connection location 66 along the first support portion 651.

  The second projection format is a format in which an image is viewed through the reflector 67 in the bore 53. At the time of switching from the first projection format to the second projection format, the second support portion 653 moves so that, for example, the reflection plate 67 is positioned immediately above the subject fixture 137 as shown in FIGS. Is done. The second angle of the reflector 67 in the second projection format may be set to an arbitrary angle between horizontal and vertical according to the physique of the subject P as an observer.

  The reflection plate 67 may be configured by a prism mirror. FIG. 11 is a diagram illustrating an example of an optical path 672 when the reflecting plate 67 is a prism mirror 671. FIG. 12 is a diagram showing an optical path 674 when the reflecting plate 67 is a normal mirror 673. As shown in FIGS. 11 and 12, when a prism mirror 671 is used as the reflecting plate 67, the angle of the reflecting plate 67 can be made acute with respect to the central axis Z as compared with a normal mirror 673. Thereby, the reflecting plate 67 can be brought closer to the subject P as compared with the normal mirror 673, and the posture of the reflecting plate 67 can be lowered.

  In addition, the reflecting plate 67 may have a Fresnel structure. When a prism mirror 671 is used as the reflecting plate 67, the thickness of the reflecting plate 67 increases. At this time, a Fresnel structure may be added to the reflecting plate 67 in addition to the prism mirror 671. FIG. 13 is a diagram illustrating an example of an optical path 676 of a reflecting plate 675 in which a Fresnel structure is added to the prism mirror 671. In FIG. 11 to FIG. 13, other components other than the reflector in the movable screen device 15 are omitted. As shown in FIG. 13, the thickness of the reflecting plate 675 can be made thin like a normal mirror 673, and the angle of the reflecting plate 675 can be an acute angle with respect to the central axis Z. As a result, even in the gantry 11 having the small bore, it is possible to insert the reflecting plate 67 into the bore 53 in a state in which the subject P can visually recognize the image projected on the screen 63.

According to the configuration described above, the following effects can be obtained.
According to the medical image diagnostic apparatus 10 according to the present embodiment, the connection point 66 between the frame 65 supporting the reflector 67 and the moving body 61 is positioned on the projector side with respect to the screen 63 in the second projection format. Can do. In addition, according to the present embodiment, the frame 65 that supports the reflector 67 is provided at a position that does not block the image projected from the projector 100 onto the screen 63 and does not obstruct the space where the subject P is placed. Can be provided. Thereby, since the head side surface of the subject P placed on the top board 131 and inserted into the bore 53 is open, the subject P can obtain a feeling of opening more.

  That is, according to the medical image diagnostic apparatus 10 according to the present embodiment, even in the gantry 11 having a small bore, the second projection format does not adversely affect the imaging quality of MR imaging, and the coil shape and imaging The reflector 67 can be inserted into the bore 53 without depending on the part. In addition, according to the medical image diagnostic apparatus 10, even if the gantry 11 has a small-bore bore, it provides the subject P with a sense of openness in the patient examination space without sacrificing the patient examination space in the bore. In addition, the awareness of the frame 65 by the subject P can be reduced.

  Further, according to the medical image diagnostic apparatus 10, the first support portion 651 moves the reflector 67 along the central axis Z and the second support portion 653 moves along the outer diameter of the screen 63, so that Y The position adjustment of the reflector 67 along the axis and the Z axis can be easily performed. Thereby, it is not necessary to place the subject P on the top plate according to the position of the reflecting plate 67, and the position and angle of the reflecting plate 67 can be freely adjusted with respect to the position of the subject P placed on the top plate 131. The degree of inspection is improved and the inspection efficiency is improved.

  Further, according to the medical image diagnostic apparatus 10, a diffusion structure or the like can be provided on the inner surface of the first support portion 651. Thereby, the projection light reaching the screen 63 via the inner surface of the first support portion 651 is reduced, or the projection light is prevented from reaching the screen 63 via the inner surface of the first support portion 651. it can. Therefore, according to the medical image diagnostic apparatus 10, a clearer image can be provided to the subject P, and the comfortability in the bore 53 of the gantry 11 can be improved.

  From these facts, according to the medical image diagnostic apparatus 10 according to the present embodiment, the subject P is aware of the feeling of pressure and the feeling of wearing on the mobile screen device 15 in the second projection format during execution of MR imaging. Therefore, it is possible to provide a relaxed image projected on the screen 63 to the subject P in a wide and realistic state, and to improve the immersion feeling of the subject P with respect to the image. it can. That is, the medical image diagnostic apparatus 10 can provide the subject P with an examination environment that can sufficiently relax the subject P.

  From the above, the medical diagnostic imaging apparatus 10 can reduce anxiety about the subject P arranged in the bore and make the subject P feel the examination time shorter than the actual length. The subject P can be left stationary during the execution of imaging. For this reason, the medical image diagnostic apparatus 10 can stably collect images, and can improve the quality of an image related to the subject P.

(First application example)
The difference between this application example and the embodiment is, for example, light generated by a plurality of irradiators (in-bore illumination) provided on the second support portion 653 in the frame 65 (hereinafter referred to as bore illumination light). The project is to project on the inner wall 57 substantially above the top plate 131. That is, the 2nd support part 653 in this application example mounts the irradiator which concerns on in-bore illumination.

  FIG. 14 is a diagram illustrating a side surface of the movable screen device 15 according to this application example. As shown in FIG. 14, the second support portion 653 includes at least one irradiator 74 that generates light to irradiate the inner wall 57 of the bore 53 facing the top plate 131. The number of irradiators 74 is not limited to six as shown in FIG. The irradiator 74 is, for example, LEDs arranged in a line along a central axis Z over a predetermined length. The irradiator 74 may adjust the amount of the bore illumination light BL in accordance with the position of the movable screen device 15 in the bore in order to keep the illumination level in the bore constant.

  Further, the irradiator 74 generates light corresponding to the hue, lightness, light shape pattern, etc. for making the examination space related to the subject P arranged in the bore 53 comfortable (for example, relaxing). Good. The power supply line connected to the irradiator 74 via the movable body 61 and the first support portion 651 and the irradiator 74 are covered with a member having magnetic resistance. Instead of the irradiator 74, various nonmagnetic or antimagnetic optical devices (such as various lenses and amplifiers) may be provided in the second support portion 653. At this time, an optical fiber that transmits visible light from the outside of the bore 53 is connected to the optical device via the moving body 61 and the first support portion 651.

  In addition, when the 2nd support part 653 is comprised with the transparent material, the surface which opposes the mobile body 61 or the top plate 131 in the 2nd support part 653, ie, the lower surface of the 2nd support part 653, on the said irradiation device. Instead, a structure for reflecting and diffusing the projection light reaching the second support portion 653 to the inner wall 57 of the bore 53 may be provided. This structure is, for example, coating for forming fine uneven surfaces, blasting, and a diffuser.

According to the medical image diagnostic apparatus 10 according to this application example, in addition to the effects according to the present embodiment, the following effects can be obtained.
The medical diagnostic imaging apparatus 10 includes at least one irradiator 74 that is provided on the second support portion 653 of the frame 65 and generates light that irradiates the inner wall 57 of the bore 53 facing the top plate 131. Thereby, for example, the periphery of the subject P can be brightened due to the request of the subject P or the like. In addition, according to the medical image diagnostic apparatus 10, when the top 131 on which the subject P is placed moves between the end of the bore 53 on the bed 13 side and the imaging position, the irradiator 74 is used. The hue of light emitted to the inner wall 57 can be changed.

  From the above, according to the medical image diagnostic apparatus 10 according to this application example, it is possible to irradiate the illumination in the bore at a position optimal for the subject P, and the subject P inserted into the bore 53 You can get a sense of being engulfed by the light. In addition, when the top 131 moves to the imaging position, it is possible to produce an effect so that the periphery of the subject P watching the video can be more relaxed by the change of light.

(Second application example)
The difference between this application example and the embodiment is that the second support portion 653 and the moving body 61 have a structure that can be expanded and contracted along the central axis Z according to the position of the top plate 131 in the bore. There is a structure in which the second support portion 653 can be folded with the connection portion between the 651 and the second support portion 653 as a rotation axis. FIG. 15 is a side view showing a side surface of the movable screen device 15 according to this application example.

  As shown in FIG. 15, the movable body 61 and the second support portion 653 have a nested structure and a mechanism for expanding and contracting the movable body 61 and the second support portion 653 according to the amount of the top plate 131 inserted into the bore ( Hereinafter referred to as an expansion / contraction mechanism). The nesting structure is configured by providing, for example, a nonmagnetic linear bearing and a guide rail for each of the plurality of nestings. The expansion / contraction mechanism is, for example, various non-magnetic transmission mechanisms that connect each of the plurality of nested portions in the nested structure and the end portion of the top plate 131 on the side opposite to the projector 100. Examples of the various transmission mechanisms include a non-magnetic worm gear, a rack and pinion, a belt drive, a chain drive, and a shaft drive. Various transmission mechanisms expand and contract the movable body 61 and the second support portion 653, that is, increase or decrease the amount of overlap of the nests, according to the amount of insertion of the top plate 131.

  The movable body 61 and the second support portion 653 can be expanded and contracted along the central axis Z according to the position of the top plate 131 in the bore, that is, following the stroke of the top plate 131 by the nested structure and the extension mechanism. It becomes. Note that the expandable structure related to the moving body 61 and the second support portion 653 is not limited to the nested structure, and can be expanded and contracted along the central axis Z and has a strength capable of supporting the reflector 67. Any structure may be used.

  FIG. 15 shows the movable body 61 and the second support portion 653 before contraction along the central axis Z in a state where the movable screen device 15 is disposed outside the bore 53 on the projector side. FIG. 16 shows the moving body 61 and the second support portion 653 contracted along the central axis Z in a state where the movable screen device 15 is disposed outside the bore 53 on the projector side. As shown in FIG. 16, the length of the movable screen device 15 protruding from the projector-side bore 53 by contracting the movable body 61 and the second support portion 653 along the central axis Z is as shown in FIG. This is shorter than the length of the movable screen device 15.

  The first support portion 651 rotatably supports the contracted second support portion 653 with the X axis as a rotation axis at a connection portion between the first support portion 651 and the second support portion 653. FIG. 17 shows the screen 63 in a state in which the movable screen device 15 is disposed outside the bore 53, with the second support portion 653 having the connection portion 70 between the first support portion 651 and the second support portion 653 as the rotation axis. It shows a state of being folded towards As shown in FIG. 17, when the mobile screen device 15 is not used, the mobile screen device 15 is folded after the mobile body 61 and the second support portion 653 are contracted, and outside the bore 53 on the projector side. Be placed.

According to the medical image diagnostic apparatus 10 according to this application example, in addition to the effects according to the present embodiment, the following effects can be obtained.
According to the medical image diagnostic apparatus 10, the moving body 61 and the second support portion 653 have a structure that can expand and contract along the central axis Z according to the position of the top plate 131 in the bore, and the first support portion The second support portion 653 has a foldable structure with the connecting portion 70 between the 651 and the second support portion 653 as a rotation axis. Thus, according to this application example, when the mobile screen device 15 is located outside the bore 53 on the projector side when the mobile screen device 15 is not used, the length protruding from the bore 53 is shortened. Can do.

  From the above, the distance between the projector-side wall 500 and the gantry housing 51 in the examination room 300 can be shortened, the examination room 300 can be reduced, or the space in the examination room 300 can be effectively utilized. Can do. In addition, according to this application example, since the restriction on the movement range of the top plate 131 inserted into the bore is relaxed, the examination room 300 can be used efficiently. Further, even when the mobile screen device 15 is not used, the mobile screen device 15 can be stored spatially efficiently outside the bore 53 on the projector side.

(Second Embodiment)
The difference from the first embodiment is that the lower end of the screen 63 is located below the placement surface of the subject P on the top plate 131 inserted in the bore. FIG. 18 is a perspective view of the movable screen device 15 according to the present embodiment. As shown in FIG. 18, the lower end of the screen 63 is positioned below the placement surface of the subject P on the top plate 131. At this time, a gap is provided between the top plate 131 and a part of the screen positioned below the placement surface of the subject P on the top plate 131 (hereinafter referred to as a lower screen). The projection light LP projected from the projector 100 onto the screen 63 also reaches the lower screen. Due to this gap, the subject P placed on the top board 131 can visually recognize the image on the lower screen through the reflection plate 67. Although FIG. 18 shows one arm as the second support portion 653, the second support portion 653 may be two arms as shown in FIGS. 4 to 7 and FIG.

  FIG. 19 is a side view showing a side surface of the movable screen device 15 of the present embodiment. As shown in FIG. 19, the image projected from the projector 100 to the screen 63 also reaches the lower screen. FIG. 20 is a view of the mobile screen device 15 according to the present embodiment as viewed from the projector side. The movable screen device 15 in FIGS. 19 and 20 has two arms as the second support portion 653. As shown in FIG. 20, the screen 63 in the present embodiment has a notch portion corresponding to the cross-sectional shape of the second support portion 653 in order to pass the second support portion 653 from the projector side to the top plate side. You may do it.

According to the medical image diagnostic apparatus 10 according to the present embodiment, the following effects can be obtained in addition to the effects according to the first embodiment.
According to the medical image diagnostic apparatus 10, the lower end of the screen 63 can be disposed below the mounting surface of the subject P on the top plate 131 inserted in the bore. Thereby, the area of the screen 63 in this embodiment becomes larger than the cross-sectional area of the bore 53 above the top plate 131. Thereby, the image projected on the screen 63 can be provided over a wider visual field range of the subject P, and the immersion feeling of the subject P with respect to the image can be improved. That is, the medical image diagnostic apparatus 10 can provide the subject P with an examination environment that can sufficiently relax the subject P.

  From the above, the medical image diagnostic apparatus 10 can further reduce the anxiety about the subject P arranged in the bore and make the subject P feel the examination time shorter than the actual length. Therefore, the subject P can be left stationary during the execution of imaging. For this reason, the medical image diagnostic apparatus 10 can collect images more stably, and can further improve the quality of the image related to the subject P.

(Third embodiment)
The difference between the first embodiment and the second embodiment is that the frame 65 has a substantially cylindrical shape that extends along an arc along the inner wall 57 of the bore 53 along the central axis Z from the projector side beyond the screen 63. Is to have.

  FIG. 21 is a side view showing a side surface of the movable screen device 15 according to the present embodiment. FIG. 22 is a view of the mobile screen device 15 according to the present embodiment as viewed from the projector side. As shown in FIGS. 21 and 22, the frame 65 has a diameter larger than the outer diameter of the screen 63 and smaller than the inner diameter of the bore 53. The frame 65 is thick enough to support the reflector 67. The thickness of the frame 65 is, for example, a thin shape that is thinner than the gap between the inner wall 57 of the bore 53 and the screen 63. Note that the frame 65 in the present embodiment may be made of a transparent material.

  As shown in FIGS. 21 and 22, the lower end of the screen 63 in this embodiment is positioned below the mounting surface of the top plate 131. Note that the lower end of the screen 63 in the present embodiment may be at a level corresponding to the placement surface of the top plate 131 as in the screen 63 as shown in the first embodiment.

  As shown in FIG. 21, at the end of the frame 65 on the top plate side, the portion farthest from the projector 100 is a position facing the upper portion of the inner wall 57 of the bore 53, and the portion closest to the projector 100 is the top. This is a position adjacent to the mounting surface of the plate 131. That is, the end of the frame 65 on the top plate side is cylindrical from the position close to the upper end of the bore 53 to the placement surface on the projector side from the position where the head of the subject P is placed on the top plate 131. It has a shape that is truncated (truncated). In addition, the shape of the edge part by the side of the top plate of the flame | frame 65 is not limited to the said description.

According to the medical image diagnostic apparatus 10 according to the present embodiment, the following effects can be obtained.
According to the medical image diagnostic apparatus 10, the screen 63 is moved from the projector side along the central axis Z along the arc along the inner wall 57 of the bore 53 with a thickness thinner than the gap between the screen 63 and the inner wall 57 of the bore 53. It has the substantially cylindrical frame 65 extended beyond. Thereby, according to the medical image diagnostic apparatus 10 which concerns on this embodiment, the flame | frame 65 which supports the reflecting plate 67 can be provided, without sacrificing patient examination space. Further, according to the movable screen device 15 according to the present embodiment, since the frame 65 is substantially cylindrical, it does not become an obstacle in the visual field range of the subject P and has the same effects as described in the first embodiment. Can be obtained.

(Fourth embodiment)
The difference from the first to third embodiments is the structure of the first support portion 651. The connection point 66 according to the present embodiment is located on the projector 100 side with respect to the screen 63. The gap between the upper end of the screen 63 and the inner wall 57 of the bore 53 is larger than the gap between the left and right ends of the screen 63 and the inner wall 57. FIG. 23 is a diagram illustrating a front view of the mobile screen device 15 according to the present embodiment together with a front view of the mobile screen device 15 according to the first to third embodiments. As shown in FIG. 23, the gap GA2 between the upper end of the screen 63 and the inner wall 57 of the bore 53 in this embodiment is larger than the gap GA1 between each of the left and right ends of the screen 63 and the inner wall 57. FIG. 24 is a top view of the mobile screen device 15 according to the present embodiment and the mobile screen device 15 according to the first to third embodiments, as viewed from the top surface of the top plate 131. As shown in FIG. 23 and FIG. 24, according to the present embodiment, the viewing angle VA2 of the subject P via the reflector 67 is set to the subject P via the reflector 67 in the first to third embodiments. The viewing angle VA1 can be made wider. Further, according to the present embodiment, as shown in FIGS. 23 and 24, the reach L2 of the projection light that has passed through the gap between the screen 63 and the inner wall 57 to the inner wall 57 is set to the first to third embodiments. Can be made wider than the reach L1 of the projection light. Thereby, this embodiment can make projection light reach the wider area | region of the inner wall 57 compared with the 1st thru | or 3rd embodiment.

  FIG. 25 is a perspective view of the movable screen device 15 according to the present embodiment. As shown in FIG. 25, the lower end of the first support portion 651 is provided on the moving body 61 via a linear motion bearing and guide rail 62 (not shown). A connection portion 66 between the frame 65 and the moving body 61 corresponds to a contact surface between the linear motion bearing and the guide rail 62. Further, the second support portion 653 immediately above the rectangular reflector 67 having the long side in the Y-axis direction is disposed at a position away from the reflector 67 by a predetermined interval. A portion 655 of the second support portion 653 directly above the reflection plate 67 functions as a handle for moving the frame 65 along the central axis Z, as shown in FIG.

  The outer edge of the screen 63 preferably has a shape in which the gap between the upper end of the screen 63 and the inner wall 57 is larger than the gap between the left and right ends of the screen 63 and the inner wall 57. For example, when the cross-sectional shape of the bore 53 is circular as shown in FIG. 6, the shape of the outer edge of the screen 63 is the length along the X axis and the length along the Y axis at the outer edge of the screen 63. Is an ellipse with a short axis. That is, the shape of the outer edge of the screen 63 in the present embodiment is shown in FIGS. 4, 6, and 7 by extending the left and right ends of the outer edge of the screen 63 shown in FIGS. 4, 6, and 7 along the X axis. The upper end of the outer edge of the screen 63 is shortened along the Y axis. The shape of the outer edge of the screen 63 is not limited to an ellipse that is flat in the vertical direction. If the relationship of the gap sizes can be maintained, the polygon, the conic curve, and the upper portion of the screen 63 shown in FIG. It may be a simple structure.

  In the first support portion 651, the upper portion located above the connection position (connection portion) between the first support portion 651 and the second support portion 653 is such that the projection light LP emitted from the projector 100 is separated from the outer edge of the screen 63. It is provided at a position where it can pass over the region between the bore 53 and the inner wall 57. In other words, the upper portion of the first support portion 651 is formed so as not to block the projection light LP that passes between the outer edge of the screen 63 and the inner wall 57 of the bore 53. At this time, a part of the projection light LP is projected onto the inner wall 57 of the bore 53 by passing between the screen 63 and the upper portion and then passing through the gap between the screen 63 and the inner wall 57. As shown in FIG. 25, when the second support portion 653 has a U-shape, the space through which the projection light projected onto the inner wall 57 of the bore 53 passes through the upper portion of the screen 63 passes through the first support portion 651. This is a space surrounded by the upper part of the second support portion 653. That is, as shown in FIG. 25, the frame 65 has an opening surrounded by an upper portion of the first support portion 651 and the second support portion 653. In other words, when the second support portion 653 has a U-shape, the opening portion is a screen in a state where the subject P placed on the top plate 131 can visually recognize the image through the reflection plate 67. 63 is arranged across.

  An example of an upper portion of the first support portion 651 that does not block the projection light LP will be described. As shown in FIG. 25, the first support portion 651 has a central axis in a lower portion where the width TH2 along the central axis Z in the upper portion of the first support portion 651 is located below the connection position in the first support portion 651. It is formed to be narrower than the width TH1 along Z. At this time, the gap GA <b> 2 between the upper portion and the screen 63 is wider than the gap GA <b> 1 between the lower portion of the first support portion 651 and the screen 63. Note that the upper portion of the first support portion 651 may be omitted if there is strength to support the second support portion 653 and the reflection plate 67. At this time, an opening region is provided for allowing the projection light to reach the inner wall 57 of the bore 53 from the handle 655 of the second support portion 653 toward the projector 100.

According to the configuration described above, the following effects can be obtained.
According to the medical image diagnostic apparatus 10 according to the present embodiment, the connection portion 66 between the frame 65 and the moving body 61 is located on the projector 100 side with respect to the screen 63, and the upper end of the screen 63 and the inner wall 57 of the bore 53. The gap between the left and right ends of the screen 63 and the inner wall 57 can be made larger. In addition, by making the shape of the reflection plate 67 rectangular, it is possible to provide the subject P with an image projected on the screen 63 over a wider visual field range by utilizing the horizontal width of the screen 63. Further, according to the medical image diagnostic apparatus 10, the projection light LP emitted from the projector 100 can pass over the region between the outer edge of the screen 63 and the inner wall 57 in the upper portion of the first support portion 651. Can be provided in position. In addition, according to the medical image diagnostic apparatus 10, the gap between the upper part of the first support part 651 and the screen 63 is made wider than the gap between the lower part of the first support part 651 and the screen 63. be able to. Furthermore, according to the medical image diagnostic apparatus 10, the width along the central axis Z in the upper portion of the first support portion 651 is made narrower than the width along the central axis Z in the lower portion of the first support portion 651. Can do. That is, according to the present embodiment, the projection light can reach a wider area of the inner wall 57 than in the first embodiment. Thus, according to the present embodiment, the shape of the screen 63 can be formed in a shape suitable for the desired range in order to allow the projection light onto the inner wall 57 to reach the desired range. That is, according to the present embodiment, the reach of the projection light on the inner wall 57 can be designed (set) by the shape of the screen 63.

  From these facts, according to the medical image diagnostic apparatus 10 according to the present embodiment, the projection light LP can be projected over a wide range by the inner wall 57 on the back side of the rectangular reflecting plate 67 utilizing the horizontal width of the screen 63. According to the medical image diagnostic apparatus 10, the periphery of the reflector 67 can be filled with an image in the field of view of the subject P placed on the top 131 and inserted into the bore 53. Thereby, it is possible to provide the subject P with an image space that has a higher field of view and is considered to be highly realistic, and the image reflected by the reflector 67 and the image projected on the inner wall 57 of the bore 53 It is possible to improve the immersion feeling and the sense of unity of the subject P with respect to the video. That is, the medical image diagnostic apparatus 10 can provide the subject P with an examination environment that can sufficiently relax the subject P.

  From the above, the medical image diagnostic apparatus 10 can further reduce the anxiety about the subject P arranged in the bore and make the subject P feel the examination time shorter than the actual length. Therefore, the subject P can be left stationary during the execution of imaging. For this reason, the medical image diagnostic apparatus 10 can collect images more stably, and can further improve the quality of the image related to the subject P.

  According to the medical image diagnostic apparatus such as the embodiment described above and at least one application example, the comfortability in the bore of the gantry 11 can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Medical diagnostic imaging system (magnetic resonance imaging system), 10 ... Medical diagnostic imaging apparatus (magnetic resonance imaging apparatus), 11 ... Stand, 13 ... Sleeper, 15 ... Mobile screen apparatus, 17 ... Imaging control unit, 21 ... Inclination Magnetic field power supply, 23 ... transmission circuit, 25 ... reception circuit, 27 ... console, 31 ... imaging control circuit, 32 ... reconstruction circuit, 33 ... image processing circuit, 34 ... communication circuit, 35 ... display circuit, 36 ... input circuit, 37 ... main memory circuit, 38 ... system control circuit, 41 ... static magnetic field magnet, 43 ... gradient magnetic field coil, 45 ... RF coil, 51 ... gantry housing, 53 ... bore, 55 ... rail, 57 ... inner wall, 61 ... movement Body 63 ... Screen 65 ... Frame 66 ... Connection point 67 ... Reflector plate 68 ... Damping device 70 ... Connection part 72 ... Damping device 74 ... Irradiator 100 ... Projector 131 ... Top plate, 133 ... Base, 135 ... Bed driving device, 137 ... Subject fixture, 200 ... Projector control device, 300 ... Examination room, 400 ... Control room, 500 ... Wall, 510 ... Window, 651 ... No. 1 support part, 653 ... second support part, 655 ... handle, D1 ... door, D2 ... door, D3 ... door, GA1 ... gap between the lower part of the first support part and the screen, GA2 ... first support part A gap between the upper portion of the screen and the screen, L1... Reach range of the projection light that has passed through the gap between the screen and the inner wall in the first to third embodiments, and L2... The screen in the fourth embodiment. The reach range of the projection light that has passed through the gap with the inner wall to the inner wall, TH1... The width along the central axis Z in the lower part of the first support part, TH2 ... along the central axis Z in the upper part of the first support part Width, G1 ... Gap, RR ... rotating shaft, VA1 ... viewing angle of the object through the reflection plate in the first to third embodiments, VA2 ... viewing angle of the object through the reflection plate in the fourth embodiment.

Claims (18)

A platform in which a bore is formed and equipped with a medical imaging mechanism;
A movable body movable in the bore along the central axis of the bore;
A screen provided on the moving body, on which an image from the projector is projected from the side opposite to the insertion side of the top plate to the bore;
A reflector that reflects the image projected on the screen;
A frame provided on the movable body and supporting the reflector;
Comprising
The connection point between the frame and the moving body is a medical position located on the projector side with respect to the screen in a state in which a subject placed on the top plate can visually recognize the image through the reflection plate. Diagnostic imaging device.   The medical image diagnostic apparatus according to claim 1, wherein a gap between an upper end of the screen and an inner wall of the bore is larger than a gap between each of left and right ends of the screen and the inner wall. The frame is
A first support portion connected to the moving body at the connection location and disposed on the projector side with respect to the screen;
A second support part extending from the first support part through a gap between the outer edge of the screen above the midpoint between the upper end and the lower end of the screen and the inner wall of the bore, and supporting the reflector;
The medical image diagnostic apparatus according to claim 1, comprising:   The medical image diagnostic apparatus according to claim 3, wherein the first support portion has a shape curved along the inner wall.   The upper portion of the first support portion, which is located above the connection position between the first support portion and the second support portion, projects light emitted from the projector into a region between the outer edge and the inner wall. The medical image diagnostic apparatus according to claim 3, wherein the medical image diagnostic apparatus is provided at a position where it can pass through.   The medical image diagnostic apparatus according to claim 5, wherein a gap between the upper portion and the screen is wider than a gap between a lower portion located below the connection position in the first support portion and the screen. .   The medical image diagnostic apparatus according to claim 6, wherein a width along the central axis in the upper portion is narrower than a width along the central axis in the lower portion. At least one of the second support part and the moving body is:
The medical image diagnostic apparatus according to any one of claims 3 to 7, wherein the medical image diagnostic apparatus is extendable along the central axis according to a position of the top plate in the bore. At least one of the second support part and the moving body contracts along the central axis in a state where the moving body is disposed outside the bore on the projector side,
The medical image diagnostic apparatus according to claim 8, wherein the second support part is foldable with a connection position between the first support part and the second support part as a rotation axis in the state of being arranged outside.   10. The diffusion structure for diffusing the projection light that has reached the surface among the projection light emitted from the projector is provided on a surface of the first support portion that faces the moving body. The medical image diagnostic apparatus according to any one of the above.   The medical image diagnostic apparatus according to any one of claims 1 to 10, wherein a lower end of the screen is positioned below a placement surface of the subject on the top plate inserted in the bore.   The medical image diagnostic apparatus according to claim 1, wherein the reflecting plate is configured by a prism mirror.   The medical image diagnostic apparatus according to claim 1, wherein the reflector has a Fresnel structure.   The medical image diagnostic apparatus according to any one of claims 1 to 13, further comprising a vibration damper provided on the movable body and configured to suppress vibration of the reflector due to vibration of the movable body. The reflector is
At least one of movement along the central axis, movement along a direction perpendicular to the top plate, and rotation about a direction orthogonal to the central axis and the perpendicular direction can be realized. The medical image diagnostic apparatus according to claim 1, wherein the medical image diagnostic apparatus is supported by the frame.   The medical image diagnostic apparatus according to any one of claims 1 to 15, further comprising at least one irradiator that is provided on the frame and generates light that irradiates an inner wall of the bore facing the top plate. .   The medical image diagnostic apparatus according to any one of claims 1 to 16, wherein the frame is made of a transparent material. A platform in which a bore is formed and equipped with a medical imaging mechanism;
A movable body movable in the bore along the central axis of the bore;
A screen provided on the moving body, on which an image from the projector is projected from the side opposite to the insertion side of the top plate to the bore;
A reflector that reflects the image projected on the screen;
A frame provided on the movable body and supporting the reflector;
Comprising
The connection point between the frame and the moving body is located on the projector side with respect to the screen,
The medical diagnostic imaging apparatus, wherein a gap between an upper end of the screen and an inner wall of the bore is larger than a gap between each of left and right ends of the screen and the inner wall.