JP2020124510A - Medical image diagnostic apparatus and medical image diagnostic system - Google Patents

Abstract

To improve habitability in a bore of a frame.SOLUTION: A medical image diagnostic apparatus comprises: a frame on which a bore is formed and which is equipped with a medical imaging mechanism; a bed for moving a top plate on which a subject is to be mounted; a mobile body that is provided separately from the top plate and is movable along the center axis of the bore; a screen provided on the mobile body; a reflection plate for reflecting video on the screen toward the subject; a support body that is provided on the mobile body and supports the reflection plate; and a connection unit for connecting the mobile body with the top plate. When the mobile body is positioned at an end of the bore, connection and connection release are performed at the connection unit.SELECTED DRAWING: Figure 18

Description

Embodiments of the present invention relate to a medical image diagnostic apparatus and a medical image diagnostic system.

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 mount. MR (Magnetic Resonance) imaging is performed with a patient inserted in the bore. Although a gantry with a relatively large bore diameter has been developed, there are many patients who are stressed by the MR examination due to a long MR imaging time, noise during driving the gantry, and feeling of pressure and blockage in the bore. ..

JP, 2001-314391, A

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

The medical image diagnostic apparatus according to the present embodiment has a bore, a gantry equipped with a medical imaging mechanism, a bed for moving a table on which a subject is placed, and the table provided separately, A movable body movable along the central axis of the bore, a screen provided on the movable body, a reflection plate for reflecting the image on the screen toward the subject, and a reflection body provided on the movable body. A support body that supports a plate and a connecting portion that connects the moving body and the top plate are provided. When the moving body is located at an end of the bore, connection and disconnection in the connecting portion is performed. ..

FIG. 1 is a diagram showing a configuration of a medical image diagnostic system including a medical image diagnostic apparatus according to this embodiment. FIG. 2 is a diagram showing the configuration of the magnetic resonance imaging apparatus according to the present embodiment. FIG. 3 is a diagram showing an example of an installation environment of the magnetic resonance imaging system according to the present embodiment. FIG. 4 is a perspective view of the gantry housing according to the present embodiment. FIG. 5 is a perspective view of the movable screen device according to the present embodiment. FIG. 6 is a side view of the mobile screen device of FIG. FIG. 7 is a front view of the mobile screen device of FIG. FIG. 8 is a perspective view of the movable screen device and the top plate connected to each other according to the present embodiment. FIG. 9 is a schematic front view of the screen arranged in the bore according to the present embodiment. FIG. 10 is a side view of the movable screen device in which the support arm of FIG. 6 is slid with respect to the Z axis. FIG. 11 is a simplified side view of the movable screen device arranged in the bore of the gantry according to this embodiment. FIG. 12 is a simple side view of the movable screen device and the top plate according to the present embodiment. FIG. 13 is a diagram showing the connection between the movable screen device according to this embodiment and the top plate. FIG. 14 is a diagram showing the release of the connection between the movable screen device and the top plate according to the present embodiment. FIG. 15 is a diagram showing a typical flow of an MR examination using the magnetic resonance imaging system according to the present embodiment. FIG. 16 is a diagram showing the movable screen device in the first projection format according to the present embodiment from the side of the gantry. FIG. 17 is a diagram showing the movable screen device in the first projection format according to the present embodiment from the front of the gantry. FIG. 18 is a view showing the movable screen device in the second projection format according to the present embodiment from the side of the gantry. FIG. 19 is a schematic diagram of the mobile screen device according to the first application example. FIG. 20 is a diagram schematically showing a mobile screen device according to Application Example 2. FIG. 21 is a side view of the movable screen device according to the third application example. FIG. 22 is a side view of the entire mobile screen device and gantry according to Application Example 3. FIG. 23 is a diagram showing a movable screen device in which an optical camera according to Application Example 3 is attached to a support arm. FIG. 24 is a diagram showing a movable screen device in which an optical camera according to Application Example 3 is attached to a screen. FIG. 25 is a side view of the movable screen device according to the fifth application example. FIG. 26 is a side view of the entire mobile screen device and gantry according to Application Example 5. FIG. 27 is a side view of the movable screen device according to the application example 6. FIG. 28 is a view showing an XZ section (horizontal section) of the support arm according to the present embodiment. 29: is a figure which shows the XZ cross section (horizontal cross section) of the support arm which concerns on the example 8 of an application.

The following techniques are conceivable as techniques for reducing stress in MR examination. For example, 1. Goggle type head mounted display, 2. 2. Installation of LCD monitor on the ceiling or wall of the inspection room. There is a head coil to which a mirror for viewing an image on a liquid crystal monitor arranged behind the gantry is attached. However, in the case of the first technique, attaching the head mounted display to the patient's head gives the patient a feeling of pressure and blockage. In the case of the technique of 2, the image of the liquid crystal monitor cannot be seen when the patient enters the gantry. In the case of the technique of No. 3, the image can be viewed through the mirror attached to the head coil during MR imaging, so the feeling of blockage due to the bore can be reduced. However, a mirror must be attached for each head coil. Further, since the mirror is attached to the gap of the head coil that covers the head, the patient cannot perceive the spread of the image. In addition, since there is nothing to hide the front of the gantry because the LCD monitor is installed behind the gantry, the patient can easily see the bore when outside the gantry before the MR imaging. You can't wipe away the sensation of being inside the bore even while watching the image through the mirror. Furthermore, since the positional relationship between the mirror and the liquid crystal monitor changes with the movement of the tabletop, even if the patient sees the image on the liquid crystal monitor through the mirror while the tabletop is moving, the patient still has a feeling of moving in the bore.

Hereinafter, a medical image diagnostic apparatus and a magnetic resonance imaging apparatus according to the present embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a medical image diagnostic system 1 including a medical image diagnostic apparatus 10 according to this 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 in a wired or wireless communicable manner. 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 has 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 patient P is placed. The bed 13 moves the top plate under the control of 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 on 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 the projector 100 with data relating to the image to be projected. The projector 100 projects an image corresponding to the data from the projector control device 200 on the screen of the mobile screen device 15. As the projector 100, for example, a liquid crystal system, a DLP (Digital Light Processing) system, an LCOS (Liquid Crystal On Silicon) system, a GLV (Grating Light Valve) system, or the like may be used. In this case, the projector 100 is equipped with 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 via an optical system. Light transmitted or reflected from the display device (hereinafter referred to as projection light) is directly or indirectly emitted to the outside of the projector 100 via an optical system. By irradiating the mobile screen device 15 with 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. The imaging control unit 17 also reconstructs a medical image of the patient P based on raw data collected by the gantry 11 in medical imaging. The imaging control unit 17 may be configured to control the projector 100 via the projector control device 200. Further, the imaging control unit 17 may supply the projector 100 with data regarding the image to be projected. In this case, the projector 100 projects an image corresponding to the data from the imaging control unit 17 on the screen of the mobile screen device 15.

The configuration of the medical image diagnostic system 1 in this embodiment is not limited to the above. For example, if the imaging control unit 17 has a function of controlling the projector 100 by the projector control device 200, the projector control device 200 does not need to be provided in the medical image diagnostic system 1.

The medical image diagnostic system 1 according to the present embodiment uses the projector 100 and the movable screen device 15 to make it possible to enhance the habitability 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 patient P using the gantry 11 having the bore. Specifically, the medical image diagnostic apparatus 10 according to the present embodiment includes a magnetic resonance imaging (MRI) apparatus, an X-ray computed tomography (CT) apparatus, and a PET (Positron Emission Tomography) apparatus. And a single modality such as a SPECT (Single Photon Emission Computed Tomography) device. Alternatively, the medical image diagnostic apparatus 10 according to this embodiment may be applied to a combined modality such as an MR/PET apparatus, a CT/PET apparatus, an MR/SPECT apparatus, a CT/SPECT apparatus. However, in order to specifically describe the following description, the medical image diagnostic apparatus 10 according to this embodiment is assumed to be the 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 controller 200 will be referred to as a magnetic resonance imaging system 1.

FIG. 2 is a diagram showing the 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 has a gradient magnetic field power supply 21, a transmission circuit 23, a reception circuit 25, and a console 27. The console 27 has an imaging control circuit 31, a reconfiguration circuit 32, an image processing circuit 33, a communication circuit 34, a display circuit 35, an input circuit 36, a main memory circuit 37, and a system control circuit 38. The image pickup 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 has a static magnetic field magnet 41, a gradient magnetic field coil 43, and an RF coil 45. Further, the static magnetic field magnet 41 and the gradient magnetic field coil 43 are housed in a casing (hereinafter, referred to as a gantry casing) 51 of the gantry 11. A hollow 53 having a hollow shape is formed in the gantry housing 51. The RF coil 45 is arranged in the bore 53 of the gantry housing 51. Further, the movable screen device 15 according to the present embodiment is arranged in the bore 53 of the gantry housing 51.

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 or a normal conducting magnet is used. Here, the central axis of the static magnetic field magnet 41 is defined as the Z axis, an axis perpendicular to the Z axis is called the Y axis, and an axis horizontally orthogonal to the Z axis is called the X axis. The X axis, the Y axis, and the Z axis form an orthogonal three-dimensional coordinate system.

The gradient magnetic field coil 43 is a coil unit attached to the inside of the static magnetic field magnet 41 and formed into a hollow, substantially cylindrical shape. The gradient magnetic field 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 under the control of the imaging control circuit 31. The gradient magnetic field power supply 21 causes the gradient magnetic field coil 43 to generate a gradient magnetic field by supplying a current to the gradient magnetic field coil 43.

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

The transmission circuit 23 transmits a high frequency magnetic field for exciting target atomic nuclei existing in the patient P to the patient P via the RF coil 45. A proton is typically used as the target atomic nucleus. Specifically, the transmission circuit 23 supplies a high frequency signal (RF signal) for exciting the target atomic nucleus to the RF coil 45 under the control of the imaging control circuit 31. The high-frequency magnetic field generated from the RF coil 45 vibrates at the resonance frequency peculiar to the target atomic nucleus and excites the target atomic nucleus. An MR signal is generated from the excited target nucleus and is detected by the RF coil 45. The detected MR signal is supplied to the receiving circuit 25.

The reception circuit 25 receives the MR signal generated from the excited target atomic 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 wire or wireless.

A bed 13 is installed adjacent to the gantry 11. The bed 13 includes a top plate 131 and a base 133. A patient P is placed on the top plate 131. The base 133 supports the top plate 131 slidably along each of the X axis, the Y axis, and the Z axis. A bed driving device 135 is housed in the base 133. The bed driving device 135 moves the top 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 has, as hardware resources, a processor such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit) and a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The imaging control circuit 31 synchronously controls the gradient magnetic field power supply 21, the transmission circuit 23, and the reception circuit 25 based on the pulse sequence information supplied from the system control circuit 38, and uses a pulse sequence corresponding to the pulse sequence information. The patient P is imaged.

The reconfiguring circuit 32 has, 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 of the patient P based on the MR signal from the reception circuit 25. For example, the reconstruction circuit 32 performs a Fourier transform or the like on the MR signal arranged in the k space or the frequency space to generate an MR image defined in the real space. The reconfiguration circuit 32 is an application-specific integrated circuit (ASIC) that realizes a reconfiguration function, a field programmable gate array (Field Programmable Logic Device: FPGA), or another composite programmable logic device ( It may be realized by a Complex Programmable Logic Device (CPLD) or a Simple Programmable Logic Device (SPLD).

The image processing circuit 33 has, as hardware resources, a processor such as a CPU, a GPU, and an MPU, and a memory such as a ROM and a 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, SPLD that realizes the above image processing function.

The communication circuit 34 performs data communication with the projector control device 200 or the projector 100 via a wired or wireless connection (not shown). Further, 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, which will be described later, attached to the mobile screen device 15.

The display circuit 35 displays various information. For example, the display circuit 35 displays an MR image reconstructed by the reconstruction circuit 32 or an MR image subjected to image processing by the image processing circuit 33. Further, the display circuit 35 may display an image projected by the projector 100. Specifically, the display circuit 35 has a display interface circuit and a display device. The display interface circuit converts data representing a display target into a video signal. The display signal is supplied to the display device. The display device displays a video signal representing a display target. As the display device, for example, a CRT display, a liquid crystal display, an organic EL display, an LED display, a plasma display, or any other display known in the art can be appropriately used.

The input circuit 36 specifically includes an input device and an input interface circuit. The input device receives various commands from the user. As the input device, a keyboard, a mouse, various switches, etc. can be used. The input interface circuit supplies the output signal from the input device to the system control circuit 38 via the bus. The input circuit 36 is not limited to the one including 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. Included in the example of circuit 36.

The main storage circuit 37 is a storage device such as an HDD (hard disk drive), an SSD (solid state drive), or an integrated circuit storage device that stores various information. Further, the main storage circuit 37 may be a drive device or the like that reads and writes various information from and 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 has 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 memory circuit 37, expands it in the memory, and controls each part of the magnetic resonance imaging apparatus 10 according to the expanded control program.

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

First, the 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 showing 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 in which MR imaging is performed and a control room 400 adjacent to the examination room 300 are provided. A gantry 11 and a bed 13 are installed in the examination room 300. 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 inspection room 300 is a shield room capable of shielding a leakage magnetic field from the gantry 11 and an electromagnetic field from the outside. The inspection room 300 is provided with a door D1 for entering and leaving the room. A door D2 is provided between the inspection room 300 and the control room 400 for moving between the inspection room 300 and the control room 400. In the control room 400, the console 27, the projector 100, and the 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 being separated. A window 510 that can transmit the projection light LP is provided in a portion of the wall 500 where the projection light LP propagates from the projector 100 toward the movable screen device 15. Through the window 510, the projection light LP can be propagated from the projector 100 installed in the control room 400 to the movable screen device 15 in the examination room 300. The control room 400 may also be provided with a door D3 for entering and leaving the room.

Note that the above layout is an example, and the present invention is not limited to this. For example, although the projector 100, the projector control device 200, and the console 27 are installed in the control room 400, the console 27 and the projector control device 200 may be installed in different rooms different 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 examination room 300 and the control room 400, a machine room for installing the gradient magnetic field power supply 21 and the receiving circuit 25 may be provided.

Next, the appearance of the gantry 11 will be described with reference to FIG. FIG. 4 is a perspective view of the gantry housing 51 according to this embodiment. As shown in FIG. 4, a hollow casing 53 is formed in the gantry housing 51. A rail 55 that is parallel to the central axis Z of the bore 53 is formed below the bore 53 of the gantry housing 51. The rail 55 is a structure that guides the slide of the top plate 131 and the movable screen device 15 along the central axis Z. The rail 55 is provided on the inner wall 57 of the gantry housing 51 that is in contact with the bore 53. The rail 55 is formed of a non-magnetic material that does not act on the magnetic field used for magnetic resonance imaging. Here, with respect to the Z axis, the direction from the bed side to the projector side 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. 5, 6, 7 and 8. FIG. 5 is a perspective view of the movable screen device 15 according to the present embodiment. FIG. 6 is a side view of the movable screen device 15. FIG. 7 is a front view of the mobile screen device 15. FIG. 8 is a perspective view of the movable screen device 15 and the top plate 131 which are connected to each other.

As shown in FIGS. 5, 6, 7, and 8, the movable screen device 15 includes a movable carriage 61, a screen 63, a support arm 65, and a reflection plate 67. The moving carriage 61 is a structure that moves along a rail 55 provided on the inner wall 57 of the gantry housing 51. Wheels (not shown) rolling on the rails 55 are attached to the lower portion of the moving carriage 61 in order to enhance the traveling performance on the rails 55. If the movable carriage 61 can travel on the rail 55, the wheels are not necessarily provided, and the surface contacting the rail 55 may be made of a material having a low friction coefficient. The moving carriage 61 and the rail 55 are formed so that the moving carriage 61 can move from the end of the bore 53 on the bed 13 side (−Z side) to the end on the projector 100 side (+Z side). It is preferable that the bottom surface of the moving carriage 61 has a shape that can be fitted to the rail 55. By engaging the movable carriage 61 and the rail 55, the rail 55 can be made inconspicuous when the mount 11 is viewed from the outside in a state where the movable carriage 61 is arranged at the end of the bore 53. The moving carriage 61 supports the screen 63 and the support arm 65. The movable carriage 61 is made of a non-magnetic material such as resin that does not act on the magnetic field.

As shown in FIG. 5, the moving carriage 61 is formed with a connecting portion 69 for connecting to the top plate 131. As shown in FIG. 8, the connecting portion 69 connects the moving carriage 61 and the top plate 131. A patient fixture 137 is attached to the front portion (+Z axis direction side) of the top plate 131. The patient fixture 137 fixes the head of the patient P placed on the top plate 131. The patient fixture 137 has a curved shape so as to cover the back of the head without blocking the field of view of the patient P placed on the top 131 on his back. That is, the front side of the patient fixture 137 is open. Therefore, the patient fixture 137 can reduce the occlusal sensation of the patient P and reduce the narrowing of the visual field of the patient P, as compared with the fixing portion that covers the entire head. The patient fixture 137 is integrally molded of a non-magnetic material such as resin using a mold having the above-mentioned shape.

As shown in FIGS. 5, 6, 7, and 8, the screen 63 is erected on the movable carriage 61. An image from a projector 100 (not shown) is projected on the screen 63. The screen 63 is provided so as to be tiltable with respect to the moving carriage 61. Specifically, it is tiltably provided by a tilting mechanism (not shown) provided on the moving carriage 61. By adjusting the tilt angle of the screen 63 with respect to the surface of the moving carriage 61, the screen 63 is held perpendicular to the surface of the moving carriage 61 or at a predetermined tilt angle. As described above, 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 called the back surface, and the surface on the bed 13 side is called the front surface. In order to display an image on the surface, the screen 63 may be made of a translucent material. As such a translucent material, translucent plastic or frosted glass may be used. Since the screen 63 is made of a translucent material, the projection light emitted from the projector 100 is applied to the back surface of the screen, and an image corresponding to the projection light is displayed on the front surface. Thereby, the patient P or the like can see the image projected on the surface from the bed 13 side. The screen 63 may have a plane shape or a curved shape. In the case of having a curved surface shape, it is preferable that the concave surface faces the bed 13 side, that is, is arranged so as to form a surface. When the concave surface faces the bed 13, the screen 63 can cover the rear periphery of the head of the patient P placed on the top plate 131. As a result, the field of view of the patient P can be filled with the image displayed on the screen 63 and can be immersed in the image.

FIG. 9 is a schematic front view of the screen 63 arranged in the bore 53. As shown in FIG. 9, the screen 63 has an outer diameter RS smaller than the diameter RB of the inner wall 57 that contacts the bore 53 of the gantry housing 51. By designing the outer diameter RS to be smaller than the inner diameter RB in this way, the movable screen device 15 can be inserted into the bore 53. In addition, the ventilation fan (not shown) provided in the gantry 11 blows air into the bore 53. By providing the gap G1 between the edge of the screen 63 and the inner wall 57, it is possible to prevent the wind blown from the ventilation fan from being blocked by the screen 63. The outer diameter RS may be designed to be smaller than the inner diameter RB by 10 mm to 50 mm, for example. In other words, the gap G1 may be designed to be 10 mm to 50 mm.

As shown in FIGS. 5, 6, 7 and 8, the support arm 65 is attached to the moving carriage 61. As will be described later, the support arm 65 is attached to the movable carriage 61 slidably in the Z-axis direction. The support arm 65 supports the reflection plate 67 so as to be arranged in the space on the front surface side of the screen 63. The reflection plate 67 is supported while being separated from the surface of the moving carriage 61 to the extent that it does not hit the head of the patient P placed on the ceiling plate 131 when the moving carriage 61 and the top board 131 are connected. It is supported by the arm 65. The support arm 65 has a shape that does not block the field of view of the external observer when the screen 63 is viewed from the outside of the gantry 11. In order not to block the field of view of the external observer, the support arm 65 has a semi-annular shape or a saddle shape having an arc portion along the contour of the screen 63, as shown in FIGS. 5, 6, 7, and 8. Good to have. In this case, both ends of the support arm 65 are attached to the side portions of the movable carriage 61, and the support arm 65 is attached to the movable carriage 61 so that the arc portion of the support arm 65 is located in the space on the front surface side of the screen 63. The shape of the support arm 65 is not limited to the semi-annular shape or the semi-saddle shape described above, and may have any shape as long as the reflection plate 67 can be arranged in the space on the front surface side of the screen 63. For example, the support arm 65 may be configured by a pair of arms having a substantially rod shape. In this case, it is preferable that one end of the pair of arms be attached to both side portions of the moving carriage 61 and the reflecting plate 67 be attached to the other end.

As shown in FIGS. 5, 6, 7, and 8, the reflection plate 67 is provided on the uppermost portion of the support arm 65. The reflector 67 reflects the image projected on the surface of the screen 63. The reflection plate 67 is formed of a non-magnetic material, and may be formed of any material as long as it can optically reflect an object. For example, as the reflection plate 67, a mirror obtained by subjecting acrylic to aluminum vapor deposition or a half mirror having a dielectric film attached may be used. The patient P, whose head is placed on the patient fixture 137, can see the image projected on the surface via the reflector 67.

The reflector 67 is rotatably provided on the support arm 65 so that the patient P can manually adjust the angle of the reflector 67. Specifically, it is rotatably provided around the rotation axis RR1 by a rotation mechanism (not shown) provided on the support arm 65. The rotation axis RR1 is provided 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, for example. More specifically, the support arm 65 may be at least switchably provided between a first angle for a first projection format and a second angle for a second projection format, which will be described later. .. The first projection format is a format in which the image on the screen 63 is viewed from outside the gantry 11 without the reflector 67. Therefore, the first angle of the reflection plate 67 in the first projection format is preferably set to an angle that does not obstruct the field of view of the patient P or the like outside the gantry 11, for example, substantially horizontal. The second projection format is a format for viewing an image in the bore 53 via the reflector 67. Therefore, the second angle of the reflector in the second projection format may be set to an arbitrary angle between horizontal and vertical depending on the physique of the patient P who is the observer.

In order to adjust the position of the reflection plate 67 with respect to the Z axis, the slide mechanism 71 of the support arm 65 may be provided on the moving carriage 61. FIG. 10 is a view showing a side surface of the movable screen device 15 in which the support arm 65 of FIG. 6 is slid with respect to the Z axis. As shown in FIGS. 6 and 10, in the slide mechanism 71, a guide 611 that guides the slide of the support arm 65 along the Z axis is formed on the movable carriage 61. The guides 611 are provided along both sides of the movable carriage 61 along the Z axis in order to avoid contact between the support arm 65 and the screen 63. The guide 611 may be realized by any form, but for example, it is realized by a gap provided on the side surface of the moving carriage 61 along the Z axis. As shown in FIGS. 6 and 10, in order to enhance the slidability of the support arm 65, a wheel 651 may be provided on the base portion of the support arm 65 facing the guide 611. By providing the slide mechanism 71, a medical worker such as a doctor, a technician, a nurse, a patient P, or the like pushes or pulls the support arm 65 in the Z-axis direction to bring the reflection plate 67 close to the screen 63. Or they can be separated. Accordingly, the position of the reflection plate 67 in the Z-axis direction can be adjusted.

In the above description, the slide mechanism 71 is realized by the guide 611 provided on the moving carriage 61 and the wheels 651 provided on the support arm 65. However, the present embodiment is not limited to this. The slide mechanism 71 according to the present embodiment may be any mechanism as long as the support arm 65 can slide relative to the moving carriage 61. For example, a guide along the Z-axis may be provided on the support arm 65, and wheels that travel the guide may be provided on the moving carriage 61. Further, the slide mechanism 71 may be realized by a ball screw, a slide rail, or the like.

FIG. 11 is a simple side view of the movable screen device 15 arranged in the bore 53 of the gantry 11. As shown in FIG. 11, a movable carriage 61 of the movable screen device 15 is slidably provided on a rail 55. Typically, the mobile screen device 15 does not include a drive device. The movable screen device 15 slides in conjunction with the slide of the top plate 131 by the bed driving device 135. The movable screen device 15 can also be slid about the Z axis by being pushed or pulled by the patient P, a medical staff, or the like.

Next, the connection between the movable screen device 15 and the top plate 131 will be described. FIG. 12 is a simple side view of the movable screen device 15 and the top plate 131. The base 133 of the bed 13 is not shown in FIG. As shown in FIG. 12, a connecting male portion 69 is provided at the bed-side end of the movable carriage 61 of the movable screen device 15, and a connecting male portion 69 is provided at the end of the top plate 131 on the gantry housing 51 side. Is provided with a connecting female portion 139. The connecting male part 69 and the connecting female part 139 have shapes that can be fitted to each other. The movable screen device 15 and the top plate 131 are mechanically coupled by fitting the coupling male part 69 and the coupling female part 139 together. Specifically, the connecting male part 69 is realized by at least one claw, and the connecting female part 139 is formed by at least one groove formed on the upper surface of the top plate 131. The claw 69 is provided on the movable carriage 61 so as to be rotatable around the rotation axis RR2. More specifically, the base of the claw 69 is pivotally mounted on the moving carriage 61 so that the tip of the claw 69 projects from the moving carriage 61. The claw 69 may be pivotally mounted on the moving carriage 61 via a spring (not shown) in order to generate a restoring force downward (−Y axis direction).

FIG. 13 is a diagram showing the connection between the movable screen device 15 and the top plate 131. The connection between the movable screen device 15 and the top plate 131 is typically performed when the patient P is placed on the top plate 131 and the top plate 131 is inserted into the bore 53. In order to connect the movable screen device 15 and the top plate 131, as shown in FIG. 13, in the movable screen device 15, the end surface 610 of the movable carriage 61 on the bed 13 side is located at the bed side end PE1 of the bore 53. The tip of the claw 69 is arranged so as to protrude from the bed side end PE1. If the tip of the claw 69 projects from the bed-side end PE1, the moving carriage 61 does not need to have the end surface 610 exactly coincident with the bed-side end PE1, and the end surface 610 is more than the bed-side end PE1. It may be arranged on the bed side or inside the bore 53.

First, as shown in FIG. 13, the top plate 131 is moved so that the tip portion of the claw 69 is located right above the groove 139 of the top plate 131. Then, the claw 69 is fitted into the groove 139 by raising the top plate 131. Thereby, the movable screen device 15 and the top plate 131 can be connected. By sliding the top plate 131 by the power of the bed driving device 135 in the connected state, the movable screen device 15 that does not have its own power source can be slid in conjunction with the slide of the top plate 131. The top plate 131 is moved by, for example, the bed driving device 135 according to an instruction from the user via the input circuit 36. As described above, according to this embodiment, the top plate 131 and the movable screen device 15 can be connected by a simple operation of only raising the top plate 131. It should be noted that the raising of the top plate 131 is an operation performed for inserting the patient P into the bore 53 for MR imaging. That is, the top plate 131 and the movable screen device 15 can be connected without providing an additional step.

There may be a case where the groove 139 and the claw 69 are misaligned in the Z-axis direction due to a mechanical error of the bed 13, and the groove 139 may not fit into the claw 69 even when the top plate 131 is lifted. In this case, it is advisable to slide the top plate 131 toward the movable screen device 15 after raising the top plate 131. The top plate 131 pushes the claws 69 upward by pushing the claws 69 by sliding the top plate 131. The claws 69 pushed upwards generate a downward restoring force, and the claws 69 can be fitted into the grooves 139 by further sliding the top plate 131. As described above, according to the present embodiment, even when the top plate 131 and the movable screen device 15 cannot be connected due to the rise of the top plate 131, the top plate 131 and the movable screen device are only moved by sliding the top plate 131. The device 15 can be connected.

FIG. 14 is a diagram showing the release of the connection between the movable screen device 15 and the top plate 131. As shown in FIG. 14, when the connection between the movable screen device 15 and the top plate 131 is released, the top plate 131 extends to the outside of the bore 53 so that the end surface 610 of the moving carriage 61 is located at the bed side end PE1. To be slid. Next, the top plate 131 is lowered. The claw 69 is fixed to the groove 139 in the horizontal direction (Z-axis direction and X-axis direction), but is not fixed in the vertical direction (Y-axis direction). Therefore, by lowering the top plate 131, the connection between the movable screen device 15 and the top plate 131 can be easily released.

The connection form between the top plate 131 and the movable screen device 15 is not limited to the above. If the top plate 131 is lifted to connect the top plate 131 and the movable screen device 15 and the top plate 131 is released to disconnect the top plate 131 and the movable screen device 15, the top plate 131 and the movable screen device 15 are connected in any form. May be. Further, a lock mechanism for connecting the top plate 131 and the movable screen device 15 which can be manually or mechanically switched between ON and OFF may be provided.

Next, an operation example of the magnetic resonance imaging system according to the present embodiment will be described. FIG. 15 is a diagram showing a typical flow of an MR examination using the magnetic resonance imaging system according to the present embodiment.

As shown in FIG. 15, first, before the patient P enters the examination room, a medical staff or the like places the mobile screen device 15 on the bed side end PE1 of the bore 53 (step S1). By disposing the movable screen device 15 at the bed side end PE1 of the bore 53, it is possible to prevent the bore 53 from entering the field of view when the patient P views the gantry 11 from the outside of the gantry 11.

When step S1 is performed, the projector control device 200 controls the projector 100 to project a predetermined image on the mobile screen device 15 (first projection format P1). A format in which an image is projected on the movable screen apparatus 15 in the state where the movable screen apparatus 15 is arranged at the bed side end PE1 of the bore 53 will be referred to as a first projection format P1. In order to project an image by the projector 100, the medical staff first inputs a projection instruction through the input circuit of the projector control device 200. Upon receiving the projection instruction, the projector control device 200 transmits image data of a predetermined video to the projector 100. Upon receiving the image data, the projector 100 projects an image corresponding to the received image data on the screen 63 of the mobile screen device 15. The video may be a moving image or a still image. The content of the image is not particularly limited. For example, the video may be a moving image or a still image having a relaxing effect, or may be inspection support information such as attention at the time of inspection or time until the end of inspection.

When the projection of the image in the first projection format P1 is started, the patient P enters the examination room (step S2).

FIG. 16 is a diagram showing the movable screen device 15 in the first projection format P1 from the side of the gantry 11. FIG. 17 is a diagram showing the movable screen device 15 in the first projection format P1 from the front of the gantry 11. As shown in FIGS. 16 and 17, in the first projection format P1, the mobile screen device 15 is arranged such that the end surface 610 of the moving carriage 61 is located at the bed side end PE1 of the bore 53, for example. As a result, the screen 63 is arranged at the bed side end PE1 of the bore 53 or in the vicinity thereof (hereinafter referred to as the bed side end). In the first projection format P1, the bed-side end on which the screen 63 is arranged is the bed-side end of the bore 53 unless the inside of the bore 53 is seen when the screen 63 is viewed from the outside of the bore 53. It may be arranged inside the bore 53 from the PE 1 or outside the bore 53. Since the screen 63 closes the bore 53 by being arranged at the end on the bed side, it is possible to prevent the patient P from looking inside the bore 53. Further, at this time, since the image PI is displayed on the screen 63, the patient P's recognition that the bore 53 is the examination space can be blunted, and the fear of entering the bore 53 can be eased.

In the first projection format P1, in order to improve the visibility of the screen 63 from the outside of the gantry 11, the reflection plate 67 may be held at an angle that does not obstruct the view of the patient P or the like. For example, as described above, the angle around the rotation axis RR1 of the reflection plate 67 may be maintained substantially horizontal by the support arm 65. The angle of the reflection plate 67 in the first projection format P1 is not limited to being substantially horizontal, and may be set to any angle according to the physique of the patient P and the like.

When step S2 is performed and the image projected on the movable screen device 15 is viewed, the patient P is placed on the top plate (step S3). In step S3, the head of the patient P is fixed by the patient fixing tool 137 of the top plate 131.

When step S3 is performed, the top plate 131 is raised, and the top plate 131 and the movable screen device 15 are connected (step S4). Specifically, in step S4, the medical staff presses the up button provided on the gantry 11 or the bed 13. Upon receiving the depression of the ascending button, the imaging control circuit 31 supplies an electric signal (hereinafter referred to as an ascending signal) corresponding to the ascent of the top 131 to the bed driving device 135. The bed driving device 135 that has received the lift signal lifts the top 131 in the Y-axis direction. When the top plate 131 is lifted, as described above, the groove 139 of the top plate 131 and the claw 69 of the movable screen device 15 are engaged with each other to connect the top plate 131 and the movable screen device 15. A form in which an image is projected on the movable screen device 15 while the movable screen device 15 and the top plate 131 are connected is referred to as a second projection form P2.

When step S4 is performed, the projection in the first projection format P1 is ended. The projection of the image in the first projection format P1 does not necessarily have to be terminated after the top plate 131 and the movable screen device 15 are connected (S4). For example, the projection of the image in the first projection format P1 may be completed after the patient P is placed on the top plate and before the top plate 131 and the movable screen device 15 are connected. The projector 100 receives the projection stop signal from the projector control device 200 and ends the projection of the image. The projector control device 200 supplies the projector stop signal to the projector 100, for example, upon receiving a video stop instruction from a medical staff via an input circuit or the like.

When step S4 is performed, the projector control device 200 controls the projector 100 to project a predetermined image on the mobile screen device 15 (second projection format P2). Specifically, the medical staff inputs a projection instruction through the input circuit of the projector control device 200. Upon receiving the projection instruction, the projector control device 200 transmits image data of a predetermined video to the projector 100. Upon receiving the image data, the projector 100 projects a video corresponding to the received image data on the mobile screen device 15. The video may be the same as or different from the video projected in the first projection format P1.

When the projection of the image in the second projection format P2 is started, the top plate 131 is inserted into the bore 53 (step S5). In step S5, the medical worker presses the insertion button provided on the gantry 11 or the bed 13. In response to the pressing of the insert button, the imaging control circuit 31 supplies an electric signal (hereinafter referred to as an insert signal) corresponding to the insertion of the top plate 131 to the bed driving device 135. Upon receiving the insertion signal, the bed driving device 135 slides the top plate 131 in the +Z axis direction. Since the top plate 131 and the movable screen device 15 are connected, the movable screen device 15 also slides in the +Z direction in conjunction with the slide of the top plate 131. The medical staff stops pressing the insert button when the top plate 131 slides to the photographing position, and stops the top plate.

FIG. 18 is a diagram showing the movable screen device 15 in the second projection format P2 from the side of the gantry 11. As shown in FIG. 18, the patient P placed on the top plate 131 in the second projection format P2 can see the image projected on the surface of the screen 63 through the reflector 67. Since the top plate 131 and the movable screen device 15 are connected to each other, the distance between the patient P and the screen 63 is kept constant regardless of the sliding of the movable screen device 15 in the Z-axis direction. Therefore, it is possible to enhance the feeling of immersion in the image displayed on the screen 63 and reduce the feeling of blockage in the bore 53. The projection of the image in the second projection format P2 is continued from the end of step S4 to the end of step S7.

When step S5 is performed, MR imaging is performed (step S6). In step S6, the medical staff presses the start button for MR imaging. When the start button is pressed, the imaging control circuit 31 synchronously controls the gradient magnetic field power supply 21, the transmission circuit 23, and the reception circuit 25 in accordance with a preset imaging sequence to execute MR imaging. The MR signal regarding the patient P is acquired by the MR imaging by the reception circuit 25, and the reconstruction circuit 32 reconstructs the MR image based on the MR signal. During MR imaging, the patient P can view the image displayed on the screen 63 via the reflector 67. Therefore, it is possible to comfortably spend in the bore 53 even during MR imaging for a relatively long time.

When step S6 is performed and the MR imaging is completed, the top plate 131 is retracted out of the bore 53 (step S7). In step S7, the medical staff presses the evacuation button provided on the gantry 11 or the bed 13. Upon receiving the depression of the evacuation button, the imaging control circuit 31 supplies an electric signal (hereinafter referred to as an evacuation signal) corresponding to the evacuation of the top plate 131 to the bed driving device 135. Upon receiving the evacuation signal, the bed driving device 135 slides the tabletop 131 in the −Z axis direction. When the top plate 131 is slid to the outside of the gantry 11, the movable screen device 15 is arranged at the bed side end PE1 of the bore 53. The patient P can continue to appreciate the image projected on the screen 63 through the reflection plate 67 while the top plate 131 is moved to the outside of the bore 53.

When step S7 is performed, the projection of the image in the second projection format P2 ends. For example, a medical staff or the like inputs a projection stop instruction through the input circuit of the projector control device 200. Upon receiving the projection stop instruction, the projector control device 200 supplies a stop signal to the projector 100. Upon receiving the stop signal, the projector 100 ends the projection of the image.

When step S7 is performed, the top plate 131 is lowered, and the connection between the top plate 131 and the movable screen device 15 is released (step S8). Specifically, in step S8, the medical staff presses the lowering button provided on the gantry 11 or the bed 13. In response to the depression of the lowering button, the imaging control circuit 31 supplies an electric signal (hereinafter, referred to as a lowering signal) corresponding to the lowering of the tabletop 131 to the bed driving device 135. Upon receiving the descending signal, the bed driving device 135 descends the table 131 in the Y-axis direction. When the top plate 131 is lowered, as described above, the claw 69 of the movable screen device 15 is disengaged from the groove 139 of the top plate 131, and the connection between the top plate 131 and the movable screen device 15 is released. When the top plate 131 is lowered to the initial position, the medical staff ends the pressing of the lowering button.

Then, the patient P descends from the top plate 131 and leaves the examination room.

This is the end of the description of the operation example of the magnetic resonance imaging system 1 according to the present embodiment.

Note that the flow of the above-described MR examination is an example, and the operation example of the magnetic resonance imaging system 1 according to the present embodiment is not limited to the above flow. For example, in the above flow, the lift button and the insert button are individually pressed to move the top plate 131 from the initial position to the shooting position in the bore 53. However, the present embodiment is not limited to this. For example, an automatic insertion button for instructing the raising and insertion of the top 131 at one time may be pressed. Further, in the above flow, the retract button and the descend button are individually pressed to move the top plate 131 from the bore 53 to the initial position. However, the present embodiment is not limited to this. For example, an automatic evacuation button may be pressed to instruct the evacuation and lowering of the top 131 at one time.

As described above, the medical image diagnostic apparatus 10 according to this embodiment has the gantry 11, the rail 55, the bed 13, and the movable screen device 15. The gantry 11 has a bore 53 and is equipped with a medical imaging mechanism. The rail 55 is provided parallel to the central axis Z of the bore 53 on the inner wall 57 facing the bore 53 of the gantry 11. The bed 13 moves the top plate 131 along the rails 55. Further, the movable screen device 15 is provided on the inner wall 57 of the bore 53. The movable screen device 15 includes a movable carriage 61, a screen 63, a reflection plate 67, and a support arm 65. The moving carriage 61 is provided separately from the top plate 131, and is provided so as to be movable along the rail 55. The screen 63 is erected on the moving carriage 61, and an image from the projector 100 is projected. The reflector 67 reflects the image projected on the screen 63. The support arm 65 is provided on the movable carriage 61 and supports the reflection plate 67.

With the above-described configuration, the medical image diagnostic apparatus 10 according to the present embodiment is a first projection format for projecting an image on the movable screen device 15 in a state where the movable screen device 15 is arranged at the bed side end PE1 of the bore 53. It is possible to realize the second projection format in which an image is projected on the movable screen device 15 in a state where the top plate 131 and the movable screen device 15 are connected. The projection of the image in the first projection format is performed before the patient P is placed on the top plate 131. The first projection format is capable of projecting an image on the screen 63 while blocking the bore 53 with the screen 63. Therefore, the patient P outside the bore 53 can see the image projected on the screen 63 without visually recognizing the inside of the bore 53. The projection of the image in the second projection format is performed in a state where the patient P is placed on the top plate 131 and the top plate 131 and the movable screen device 15 are connected. Typically, this is performed when the patient P placed on the top plate 131 for MR imaging is inserted into the bore 53.

As described above, the movable screen device 15 has the screen 63 and the reflection plate 67, the screen 63 is arranged behind the head of the patient P, and the image projected on the screen 63 in front of the patient P. A reflector that reflects the light is arranged. In the second projection format, since the top plate 131 and the movable screen device 15 are connected, the distance between the screen 63 and the reflection plate 67 can be kept constant regardless of the movement of the top plate 131. Therefore, an image of a constant size can always be displayed on the reflection plate 67. In addition, according to the present embodiment, since it is not necessary to attach a structure that covers the head of the patient P such as a head coil or a head mount display, the patient P does not feel a sense of blockage and has a wide field of view. You can see the video. Further, as compared with the case where the reflector 67 is attached to the head coil, it is not necessary to provide the movable screen device 15 according to the imaging site and the coil shape.

As described above, by continuously performing the first projection format and the second projection format, it is possible for the patient P to finish MR imaging without visually recognizing the inside of the bore 53 even after entering the examination room. Becomes Therefore, since the patient P is not conscious of the bore 53, the patient P can enjoy the image without feeling the blockage during MR imaging, as compared with the case of viewing the image in the bore 53 after visually recognizing the bore 53. Further, in the first projection format, since the screen 63 is arranged at the bed side end which is the entrance of the bore 53 and the image is projected on the screen 63, the patient P can be made aware of the bore 53 as the image projection space. it can. Therefore, it is possible to reduce the anxiety of the patient P when the top plate 131 is inserted into the bore 53.

Thus, according to the present embodiment, it is possible to improve the habitability in the bore of the gantry 11.

(Application example 1)
In the above embodiment, the support arm 65 is slidably supported by the slide mechanism. However, the present embodiment is not limited to this. For example, the support arm 65 may be pivotally provided by a link mechanism.

FIG. 19 is a diagram schematically showing the movable screen device 15 according to the application example 1. As shown in FIG. 19, the moving carriage 61 is provided with a link mechanism 73. The link mechanism 73 supports the support arm 65 so as to be rotatable along the rotation axis RR3. The turning axis RR3 is preferably provided parallel to the X axis so that the support arm 65 can be tilted or raised toward the moving carriage 61. As a result, in the first projection format, the support arm 65 can be tilted toward the moving carriage 61. By tilting the support arm 65, it is possible to prevent the reflector 67 and the support arm 65 from blocking the view of the patient P. Further, in the second projection format, the support arm 65 can be raised from the moving carriage 61. By raising the support arm 65, the patient P or the like placed on the top plate 131 can see the image projected on the screen 63 via the reflection plate 67.

(Application example 2)
In the above embodiment, the support arm 65 is supported by the slide mechanism or the link mechanism. However, the present embodiment is not limited to this. For example, the support arm 65 may be supported by both the slide mechanism and the link mechanism.

FIG. 20 is a schematic diagram of the mobile screen device 15 according to the second application example. As shown in FIG. 20, the support arm 65 is supported by both the first link mechanism 73 and the slide mechanism 71. For example, the support arm 65 may be supported by the first link mechanism 73 so as to be rotatable about the rotation axis RR3, and the first link mechanism 73 may be supported by the moving carriage 61 so as to be slidable about the Z axis by the slide mechanism 71. .. Further, the support arm 65 is configured to be foldable by the second link mechanism 75. In this case, the support arm 65 includes a first arm 653 provided with a reflection plate 67 rotatably around the rotation axis RR1 and a second arm connected to the movable carriage 61 via the first link mechanism 73. 655, and the first arm 653 and the second arm 655 are connected by the second link mechanism 75 so as to be capable of turning about the second turning axis RR4. As described above, the support arm 65 is configured to be foldable by the second link mechanism 75. By providing the support arm 65 with the second link mechanism 75, the support arm 65 can be housed compactly and the degree of freedom in positioning the reflection plate 67 can be improved.

In addition, in order to more compactly accommodate the support arm 65 and further improve the degree of freedom in positioning the reflection plate 67, the degree of freedom of movement of the support arm 65 is increased by combining a further slide mechanism or a link mechanism. Is also possible.

(Application example 3)
FIG. 21 is a side view of the movable screen device 15 according to the application example 3. FIG. 22 is a side view of the entire mobile screen device 15 and the gantry 11 according to the application example 3. As shown in FIG. 21 and FIG. 22, the movable screen device 15 according to the application example 3 is provided with an optical camera 80 for taking an image of the patient P placed on the top plate 131.

As shown in FIG. 22, the optical camera 80 has an objective lens 81 and an optical fiber 83. The optical camera 80 is connected to a CCD (Charge-coupled device). The objective lens 81 and the optical fiber 83 are made of a non-magnetic material. The objective lens 81 is provided on the reflection plate 67 so as to face the face of the patient P placed on the top plate 131. More specifically, the optical camera 80 may be provided on a side surface portion or the like of the reflection plate 67 so as not to enter the field of view of the patient P looking at the reflection plate 67. The objective lens 81 converges or diverges the light from the patient P. The optical fiber 83 is an optical waveguide that guides the light from the objective lens 81. The optical fiber 83 connects the objective lens 81 and the CCD 85 in order to guide the light from the objective lens 81 to the CCD 85 provided outside the gantry 11. The optical fiber 83 may be attached to the surface of the rail 55 or the inner wall 57 of the gantry housing 51, or may be embedded inside the rail 55 or the gantry housing 51. The CCD 85 has a plurality of light receiving elements that receive light from the optical fiber 83 and convert the light into electric signals. The CCD 85 generates optical image data in which the face of the patient P is drawn based on the electric signals from the plurality of light receiving elements.

Since the optical fiber 83 that connects the objective lens 81 and the CCD 85 has rigidity, there is a risk that the optical fiber 83 may be damaged when the movable screen device 15 slides. In order to prevent this, for example, a mechanism that can connect the objective lens 81 and the CCD 85 while the optical fiber 83 holds a certain curvature regardless of the sliding of the movable screen device 15 may be provided.

The optical image data is supplied to the console 27 via the communication circuit 34. An optical image corresponding to the supplied optical image data is displayed by the display circuit 35. A medical staff or the like can monitor the patient P during MR imaging by observing the optical image.

As described above, in the present embodiment, the optical camera 80 is provided in the movable screen device 15 arranged in the bore 53, so that it is more patient-friendly than the conventional surveillance camera provided outside the gantry 11. It will be provided at a position close to P. As a result, for example, the facial expression of the patient P in the gantry 11 can be photographed, so that the state of the patient P during MR imaging can be accurately captured.

Note that the optical camera 80, more specifically, the objective lens 81 is provided on the reflection plate 67, but the present embodiment is not limited to this. It may be provided on the support arm 65 as shown in FIG. Further, the optical camera 80, more specifically, the objective lens 81 may be provided on the screen 63 as shown in FIG. When the screen 63 is provided with the objective lens 81, it is difficult to make the objective lens 81 face the head of the patient P due to the positional relationship between the screen 63 and the head of the patient P. Therefore, the objective lens 81 is preferably provided at the end of the screen 63 so that the head of the patient P can be projected through the reflection plate 67.

(Application example 4)
In Application Example 3 described above, the optical camera 80 is used to monitor the patient P. However, the present embodiment is not limited to this. In the application example 4, the optical camera 80 is used to collect the body movement information of the patient P. Also in the application example 4, the optical camera 80 may be provided on the reflection plate 67, the screen 63, or the support arm 65 so as to be able to image the part of the body movement to be collected. The body movement information is position information such as an arbitrary point that changes with the body movement of the patient P. The optical image captured by the optical camera 80 includes the position information of the feature points that change with the body movement of the patient P.

In the application example 4, the image processing circuit 33 uses the optical image captured by the optical camera 80 to correct the body movement of the reconstructed image. For example, the image processing circuit 33 tracks the positions of the characteristic points of the time-series optical images in time series, and calculates the amount of movement of the characteristic points. The characteristic points can be set on any part such as the jaw and forehead of the patient P depicted in the optical image, the cervical spine, the markers attached to the patient P, and the like. Then, the image processing circuit 33 generates an image in which the body movement is corrected by coordinate-converting the reconstructed image according to the calculated movement amount.

In the application example 4, the body movement information is collected by the optical camera 80. However, the present embodiment is not limited to this. For example, the body movement information at an arbitrary point of the patient P may be collected by an optical sensor, an ultrasonic sensor, or an acceleration sensor. The optical camera according to the application example 4 may be provided separately from the camera for monitoring the patient P according to the application example 3.

(Application example 5)
FIG. 25 is a side view of the movable screen device 15 according to the application example 5. FIG. 26 is a side view of the entire mobile screen device 15 and the gantry 11 according to Application Example 5.

As shown in FIGS. 25 and 26, the movable screen device 15 according to the application example 5 is provided with the microphone 91. The microphone 91 is provided to collect a voice uttered by the patient P, for example. For example, the microphone 91 is attached to the reflection plate 67. The microphone 91 is connected via a cable 93 to an amplifier 95 provided outside the bore 53. The microphone 91 has, for example, a diaphragm and a converter, and converts the vibration of the diaphragm caused by sound into an electric signal (voice signal) by the converter. The audio signal is supplied to the converter via the cable and is amplified by the converter. The audio signal amplified by the converter is transmitted to the console 27 by wire or wirelessly. The transmitted audio signal is emitted as audio through a speaker or the like provided on the console 27. Thereby, the voice of the patient P can be transmitted to the medical staff in the control room or the like.

The microphone 91 according to this embodiment may be of any type as long as it is non-magnetic. However, as the microphone 91 according to the present embodiment, for example, a highly sensitive and non-magnetic optical microphone is suitable.

Although the microphone 91 is provided on the reflection plate 67 in the above example, it may be provided at any place as long as it can collect the voice of the patient P. For example, the microphone 91 may be provided on another structure of the movable screen device 15, such as the support arm 65 or the screen 63.

Further, the microphone 91 according to the present embodiment is not limited to the purpose of collecting the voice of the patient P. For example, the microphone 91 according to the present embodiment may be used to collect the driving sound of the gantry 11, which is used for noise canceling.

(Application example 6)
FIG. 27 is a side view of the movable screen device 15 according to the application example 6. As shown in FIG. 27, the movable screen device 15 according to the application example 6 is provided with a speaker 97. Specifically, the speaker 97 may be provided on the support arm 65 arranged near the head of the patient P. The speaker 97 generates sounds according to various uses.

The speaker 97 is connected to the projector control device 200 via a wire or wirelessly. In this case, the speaker 97 may emit the sound transmitted from the projector control device 200, which corresponds to the image projected from the projector 100 onto the mobile screen device 15, for example. Since the user can watch the image while listening to the sound, it is possible to spend the inside of the bore 53 more comfortably.

Further, the speaker 97 may be connected to the console 27 via a wire or wirelessly. In this case, the speaker 97 may emit the voice of the medical staff collected by the microphone provided in the console 27. As a result, the instructions of the medical staff and the like can be transmitted to the patient P even during MR imaging.

In order to communicate with the patient P, it is preferable to combine the speaker 97 of application example 6 and the microphone 91 of application example 5. By providing the speaker 97 of the application example 6 and the microphone 91 of the application example 5 on the mobile screen device 15, for example, the patient P and the medical staff can talk with each other. When the patient P is a child, the patient P in the bore 53 and the parent in the control room can also have a conversation. Thereby, for example, the anxiety in the bore 53 of the patient P who is a child can be reduced.

Further, in order to perform noise canceling, it is preferable to combine the speaker 97 of application example 6 and the microphone 91 of application example 5. In this case, the driving sound of the gantry 11 is collected by the microphone 91, and the electric signal corresponding to the driving sound is transmitted to the console 27. The system control circuit 38 analyzes the audio signal of the drive sound and calculates the opposite phase of the drive sound. Then, the system control circuit 38 generates an audio signal having an opposite phase of the drive sound (hereinafter referred to as a cancel signal). The communication circuit 34 transmits the cancel signal to the speaker 97. The speaker 97 converts the transmitted cancel signal into a sound wave (hereinafter referred to as a cancel sound) and outputs the sound wave. Since the phase of the drive sound of the gantry 11 and the phase of the cancel sound are in the opposite phase, the drive sound is canceled by the cancel sound in the space around the head of the patient P. In this embodiment, since the movable screen device 15 provided in the gantry 11 is provided with the microphone 91 and the speaker 97, the driving sound propagating around the patient P can be canceled with higher accuracy. Therefore, the discomfort of the patient P due to the driving sound can be reduced.

(Application example 7)
In the first projection format, the support arm 65 is located in front of the screen 63 (on the bed 13 side). Therefore, when the image of the screen 63 is viewed from the patient P outside the gantry 11, the support arm 65 may block the view. Further, in the second projection format, part of the projection light emitted from the projector 100 (hereinafter referred to as surplus light) is not emitted to the screen 63, passes through a gap with the inner wall 57 of the gantry housing 51, and passes through the screen 63. Is irradiated to the portion of the inner wall 57 located in front of. An image corresponding to the surplus light (hereinafter referred to as surplus image) is displayed on the inner wall 57. However, depending on the positional relationship between the inner wall 57 and the head of the patient P, the surplus image may be blocked by the support arm 65 and may not be in the field of view of the patient P. In order to solve these problems, a part or the whole of the support arm 65 may be formed transparent. This prevents the support arm 65 from obstructing the visual recognition of the image projected on the screen 63 in the first projection format, and the surplus arm projected on the inner wall 57 portion in the second projection format. It is possible to prevent obstruction of visual recognition of images.

(Application example 8)
FIG. 28 is a view showing an XZ section (horizontal section) of the support arm 65 according to the present embodiment. Although the top plate 131 and the movable carriage 61 are shown in FIG. 28, this is for clarifying the positional relationship of the support arm 65. In fact, the support arm 65 is different from the top plate 131 and the movable carriage 61. Not at the same height. As shown in FIG. 28, when the horizontal cross section of the support arm 65 has a rectangular shape, the surface 65A that faces the patient P and is orthogonal to the X axis is in the field of view of the patient P. In this case, the surface 65B of the support arm 65 facing the projector 100 and orthogonal to the Z axis is irradiated with the projection light, and the surface 65A of the support arm 65 is not irradiated with the projection light. Therefore, the surface 65A is visually recognized as dark by the patient P.

29: is a figure which shows the XZ cross section (horizontal cross section) of the support arm 65' which concerns on the example 8 of an application. Although the top plate 131 and the movable carriage 61 are shown in FIG. 29, this is for clarifying the positional relationship of the support arm 65 ′. In fact, the support arm 65 ′ is different from the top plate 131 and the movable carriage 61. Not at the same height. As shown in FIG. 29, the support arm 65' according to the application example 8 has a shape capable of reflecting the projection light from the projector 100 toward the inner space RI1 surrounded by the support arm 65'. Specifically, the support arm 65' may be formed so that the surface 65'A of the support arm 65' facing the projector 100 is inclined with respect to the X-axis toward the inner space RI1. For example, as shown in FIG. 29, the support arm 65' may be formed so that the horizontal cross section has a triangular shape. In this case, the surface 65′A comes into the field of view of the patient P, but since the surface 65′A is inclined with respect to the X axis, the surface 65′A receives the projection light from the projector 100 to the patient P. Can be reflected towards. Therefore, the patient P can visually recognize the surplus image on the surface 65'A.

(Application example 9)
In the above embodiment, the projection light emitted from the projector 100 is directly applied to the screen 63. However, the present embodiment is not limited to this. For example, the following forms are possible. The projector control device 200 is connected to one end (hereinafter, referred to as an entrance end) of the optical fiber, and the other end (hereinafter, referred to as an exit end) is connected to the non-magnetic projector 100. The non-magnetic projector 100 includes a movable carriage 61, a support arm 65, and a reflector 67 included in the movable screen device 15 in a front side of the screen 63 (on the side of the bed 13) so that an exit of the projector 100 faces the screen 63. Attached to. With the above configuration, it is possible to irradiate the surface of the screen 63 (the surface on the bed 13 side) with the projection light corresponding to the image data transmitted from the projector control device 200 to the projector 100 via the optical fiber. As a result, the image can always be projected on the screen 63 in a constant size.

(Application example 10)
In the above-described embodiment, in the case of the first projection format, the image from the projector 100 is projected on the screen 63 of the movable screen device 15 installed at the bed side end PE1 of the bore 53. However, the present embodiment is not limited to this. For example, another screen may be arranged on the wall surface of the gantry housing 51 on the bed 13 side so as to close the bore 53, and the image may be projected from the projector 100 onto the screen. In this case, the movable screen device 15 may be retracted outside the bore 53 so as not to block the projection light from the projector 100. Alternatively, the image may be projected from another projector 100 onto the screen without retracting the movable screen device 15 out of the bore 53. Further, the projection target of the image in the first projection format is not limited to the screen. For example, an image may be displayed in the space of the bed side end PE1 of the bore 53 by the spatial imaging device so as to close the bore 53.

According to the medical image diagnostic apparatus and the magnetic resonance imaging apparatus of at least one embodiment described above, it is possible to improve the habitability in the bore of the gantry.

While some embodiments of the present invention have been described, these embodiments are presented as examples 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 spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the scope equivalent thereto.

DESCRIPTION OF SYMBOLS 1... Medical image diagnostic system (magnetic resonance imaging system), 10... Medical image diagnostic device (magnetic resonance imaging device), 11... Stand, 13... Bed, 15... Mobile screen device, 17... Imaging control unit, 21... Tilt Magnetic field power source, 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... Stand housing, 53... Bore, 55... Rail, 57... Inner wall, 61... Move Cart, 63... Screen, 65... Support arm, 65'... Support arm, 67... Reflector, 69... Connection male part (claw), 71... Slide mechanism, 73... Link mechanism, 75... Link mechanism, 80... Optical type Camera, 81... Objective lens, 83... Optical fiber, 91... Microphone, 93... Cable, 95... Amplifier, 97... Speaker, 100... Projector, 131... Top plate, 133... Base, 135... Bed driving device, 137... Patient fixture, 139... Connection female part (groove), 200... Projector control device, 300... Examination room, 400... Control room, 500... Wall, 510... Window, 610... End face, 611... Guide, 651... Wheel, 653 ...First arm, 655...second arm, D1...door, D2...door, D3...door, G1...gap, PE1...bed side end, RI1...inner space, RR1...rotation axis, RR2...swivel axis , RR3... turning axis, RR4... turning axis

Claims (8)

A gantry with a bore formed and equipped with a medical imaging mechanism,
A bed for moving a tabletop on which the subject is placed,
A movable body that is provided separately from the top plate and is movable along the central axis of the bore,
A screen provided on the moving body,
A reflector for reflecting the image on the screen toward the subject,
A support body provided on the movable body and supporting the reflection plate;
A connecting portion for connecting the moving body and the top plate,
When the moving body is located at the end of the bore, connection and disconnection at the connecting portion is performed,
Medical image diagnostic device. The medical image diagnostic apparatus according to claim 1, wherein the screen closes the bore when the moving body is located at an end of the bore. The medical image diagnostic according to claim 1 or 2, wherein the moving body is located at a height at which the top plate connects with the moving body when the top plate descends from a height at which the moving body connects with the moving body. apparatus. The movable body moves along a rail provided on an inner wall of the bore, and is located on the rail when the top plate descends from a height at which the movable body is connected to the movable body. 2. The medical image diagnostic apparatus according to item 2. The medical image diagnostic according to any one of claims 1 to 4, wherein the moving body is connected to the top plate via the connecting portion when the top plate approaches the moving body in a horizontal direction. apparatus. The connecting portion includes a first connecting portion provided on the moving body and a second connecting portion provided on the top plate,
The first connecting portion is connected to the second connecting portion when the top plate approaches the moving body in the horizontal direction,
The medical image diagnostic apparatus according to claim 5. The moving body is
When connected to the top plate via the connecting portion, it moves in conjunction with the movement of the top plate along the central axis,
When the connection with the top plate by the connecting portion is released, regardless of the movement of the top plate, it is located at the end of the bore,
The medical image diagnostic apparatus according to claim 1. A gantry with a bore formed and equipped with a medical imaging mechanism,
A bed for moving a tabletop on which the subject is placed,
A movable body that is provided separately from the top plate and is movable along the central axis of the bore,
A screen provided on the moving body,
A projector for projecting an image on the screen,
A reflector for reflecting the image projected on the screen,
A support body provided on the movable body and supporting the reflection plate;
A connecting portion for connecting the moving body and the top plate,
When the moving body is located at the end of the bore, connection and disconnection at the connecting portion is performed,
Medical image diagnostic system.