JP6678078B2 - Medical image diagnostic equipment - Google Patents

Description

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

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

JP-A-62-233152

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

  The medical image diagnostic apparatus according to the present embodiment includes a gantry, a bed, a moving body, a screen, a reflector, and at least one outlet. The pedestal has a bore and is equipped with a medical imaging mechanism. The bed moves a top board along a central axis of the bore. The moving body is separate from or integral with the top plate, and is movable along the central axis. The screen is provided on the moving body, and projects an image from a projector. The reflecting plate reflects an image projected on the screen, the at least one outlet is provided in the bore and at a position closer to the bed than the screen, and a gas for blowing air in the bore is provided. Discharge.

FIG. 1 is a diagram illustrating a configuration of a medical image diagnostic system including a medical image diagnostic apparatus according to the present embodiment. FIG. 2 is a diagram illustrating a configuration of the magnetic resonance imaging apparatus according to the present embodiment. FIG. 3 is a diagram illustrating 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 movable screen device according to the present embodiment. FIG. 5 is a side view of the movable screen device of FIG. FIG. 6 is a front view of the mobile screen device of FIG. FIG. 7 is a perspective view of the movable screen device and the top plate according to the present embodiment. FIG. 8 is a view showing a side surface of the movable screen device arranged in the bore according to the present embodiment. FIG. 9 is a view showing a side surface of the movable screen device disposed in the bore according to the present embodiment. FIG. 10 is a diagram illustrating an example of a state in which the top board rises according to the present embodiment. FIG. 11 is a diagram illustrating a side surface of the movable screen device disposed in the bore immediately before the blow in the bore is started or immediately after the blow in the bore is stopped according to the present embodiment. FIG. 12 is a diagram illustrating an example of a state in which the top board descends according to the present embodiment. FIG. 13 is a diagram illustrating a side surface of a movable screen device disposed in a bore according to a first modification of the present embodiment. FIG. 14 is a diagram illustrating a side surface of a movable screen device according to a second modification of the present embodiment. FIG. 15 is a front view of a movable screen device 15 according to a second modification of the present embodiment. FIG. 16 is a diagram illustrating a side surface of a movable screen device disposed in a bore according to a second modification of the present embodiment. FIG. 17 is a view illustrating a side surface of a movable screen device disposed in a bore according to a third modification of the present embodiment. FIG. 18 is a diagram illustrating a system control circuit and a moving mechanism according to a third modification of the present embodiment.

  Hereinafter, a medical image diagnostic apparatus according to the present embodiment will be described with reference to the drawings. In the following description, components having substantially the same functions and configurations are denoted by the same reference numerals, and repeated description will be made when necessary.

  FIG. 1 is a diagram illustrating a configuration of a medical image diagnostic system 1 including a medical image diagnostic apparatus 10 according to the present embodiment. The medical image diagnostic system 1 includes a medical image diagnostic apparatus 10, a projector 100, a projector controller 200, and a blower 250, which are communicably connected to 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 medical imaging mechanism for realizing medical imaging. The gantry 11 is formed with a bore having a hollow shape. A bed 13 is provided in front of the gantry 11. The couch 13 movably supports a top plate on which the subject P is placed. The bed 13 moves the top board along the center axis of the bore 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 data relating to the video to be projected to the projector 100. The projector 100 projects an image corresponding to data from the projector control device 200 on 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 directly or indirectly irradiates the display device with light 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 via an optical system. When the projection light is applied to the mobile screen device 15, an image corresponding to the projection light is projected on the mobile screen device 15.

  The blower 250 blows a predetermined gas into the bore of the gantry 11 under the control of the imaging control unit 17. The predetermined gas is, for example, air in an inspection room. The blower 250 has a fan, a motor, a cooler, and the like. The cooler cools the air in the inspection room to a predetermined temperature under the control of the imaging control unit 17. The fan rotates by driving the motor. The motor rotates under the control of the imaging control unit 17. With the above configuration, the blower 250 cools the air in the inspection room and blows the cooled air into the bore of the gantry 11. Control of the cooler and the motor will be described in detail in the operation of the present embodiment.

  The imaging control unit 17 functions as a 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 raw data collected by the gantry 11 in medical imaging. The imaging control unit 17 may be configured to be able to control the projector 100 via the projector controller 200. The imaging control unit 17 controls the blower 250 in medical imaging. The configuration of the medical image diagnostic system 1 is not limited to the above.

  The medical image diagnostic system 1 makes it possible to reduce the feeling of blockage in the bore at the time of medical imaging by the medical image diagnostic device 10 using the projector 100 and the movable screen device 15. The medical image diagnostic apparatus 10 can be applied to any modality capable of imaging the subject P using the gantry 11 having a bore. More specifically, the medical image diagnostic apparatus 10 according to the present embodiment includes an MRI apparatus, an X-ray computed tomography (CT) apparatus, a PET (Position Emission Tomography) apparatus, and a SPECT (Single Photon Emission Composition) apparatus. And so on. 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 below, the medical image diagnostic apparatus 10 according to the present embodiment is assumed to be a magnetic resonance imaging apparatus 10. 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 illustrating a configuration of the magnetic resonance imaging apparatus 10 according to the present embodiment. 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 power supply 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 reconfiguration circuit 32, the image processing circuit 33, the communication circuit 34, the display circuit 35, the input circuit 36, the main storage circuit 37, and the system control circuit 38 are communicably connected to each other via a bus. . The gradient magnetic field power supply 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. The static magnetic field magnet 41 and the gradient magnetic field coil 43 are housed in a housing 51 of the gantry 11 (hereinafter, referred to as a gantry housing). A bore 53 having a hollow shape is formed in the gantry casing 51. An RF coil 45 is arranged in a bore 53 of the gantry casing 51. Further, the movable 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 is a modality 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 includes: This corresponds to a set of various imaging devices mounted on a mount in these modalities.

  The static magnetic field magnet 41 has a hollow, substantially cylindrical shape, and generates a static magnetic field inside the substantially cylindrical portion. A superconducting magnet using a superconducting coil is used as the static magnetic field magnet 41, and a static magnetic field is formed in the imaging space by a current supplied from a static magnetic field power supply (not shown). 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 a Y axis, and an axis horizontally orthogonal to the Z axis is called an 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 in 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 according to the control of the imaging control circuit 31. The gradient magnetic field power supply 21 supplies a current to the gradient magnetic field coil 43 to cause the gradient magnetic field coil 43 to generate a gradient magnetic field.

  The RF coil 45 is arranged inside the gradient magnetic field coil 43, and receives a supply of an 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 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 a wire or wirelessly. Although the above-described RF coil 45 is a coil having a transmitting / receiving function, a transmitting RF coil and a receiving RF coil may be separately provided.

  The transmission circuit 23 transmits a high-frequency magnetic field for exciting a target nucleus such as a proton 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 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 oscillates at a resonance frequency specific to the target nucleus, and excites the target nucleus. An MR signal is generated from the excited target nucleus and detected by the RF coil 45. The detected MR signal is supplied to the receiving circuit 25.

  The receiving circuit 25 receives, via the RF coil 45, an MR signal generated from the excited target nucleus. 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 has a top plate 131 and a base 133. The subject P is placed on the top 131. The base 133 supports the top plate 131 so as to be slidable along each of the X axis, the Y axis, and the Z axis. The bed 133 accommodates the bed driving device 135. The couch driving device 135 moves the top board 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 of a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) 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 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 generates a pulse sequence according to the pulse sequence information. The subject P is imaged.

  The reconfiguration 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 reconstructing circuit 32 reconstructs an MR image of the subject P based on the MR signal from the receiving 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. Note that the reconfigurable circuit 32 includes an application-specific integrated circuit (ASIC) that realizes a reconfigurable function, a field programmable gate array (Field Programmable Logic Device: FPGA), and other composite programmable logic devices (FPGAs). 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. Note that the image processing circuit 33 may be realized by an ASIC, an FPGA, a CPLD, or an 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 cable 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 an MR image reconstructed by the reconstruction circuit 32 or an MR image subjected to image processing by the image processing circuit 33. The display circuit 35 may display a video projected by the projector 100.

  The input circuit 36 has, specifically, an input device and an input interface circuit. The input device receives 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 a bus. Note that the input circuit 36 is not limited to one having physical operation components such as a mouse and a keyboard. For example, an electric signal processing circuit that receives an electric signal corresponding to an input operation from an external input device provided separately from the magnetic resonance imaging apparatus 10 and outputs the received electric signal to various circuits is also input. It is included in the example of the circuit 36.

  The main storage 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. In addition, the main storage circuit 37 may be a drive device that reads and writes various information from and to a portable storage medium such as a CD-ROM drive, a DVD drive, and a flash memory. For example, the main storage circuit 37 stores an MR image, a control program of 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 a center of the magnetic resonance imaging apparatus 10. Specifically, the system control circuit 38 reads a control program stored in the main storage circuit 37, expands the control program on the memory, and controls each unit 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, 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 inspection room 300 where MR imaging is performed and a control room 400 adjacent to the inspection 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 inspection 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 inspection room 300 is provided with a door D1 for entering and leaving the room. In addition, a door D2 for traffic between the inspection room 300 and the control room 400 is provided between the inspection room 300 and the control room 400. In the control room 400, the console 27, the projector 100, the projector controller 200, and the blower 250 are installed. The projector 100 is installed behind the gantry 11 with a wall 500 between the inspection room 300 and the control room 400 interposed therebetween. A window 510 through which the projection light LP can pass is provided in a portion of the wall 500 where the projection light LP traveling from the projector 100 to the movable screen device 15 propagates. Through the window 510, the projection light LP can be transmitted from the projector 100 installed in the control room 400 to the movable screen device 15 in the inspection room 300. Preferably, the control room 400 is also provided with a door D3 for entering and leaving the room. The blower 75 is connected to the blower 250. The blower 250 blows a predetermined gas into the bore 53 from the rear of the gantry 11 or from the front of the gantry 11 via a blower tube 75.

  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, the console 27, and the blower 250 are installed in the control room 400, the console 27, the projector control device 200, and the blower 250 are located in another room different from the projector 100. It may be installed in. The projector 100 and the blower 250 may be provided in the inspection room 300 as long as the projector 100 can be formed of a material that is not affected by a magnetic field. Further, in addition to the examination room 300 and the control room 400, a machine room or the like for installing the gradient magnetic field power supply 21 and the receiving circuit 25 may be provided.

  The gantry casing 51 has a hollow bore 53 formed therein. A rail parallel to the central axis Z of the bore 53 is formed below the bore 53 of the gantry housing 51. The rail 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 is provided on the inner wall of the gantry casing 51 in contact with the bore 53. The rail is formed of a non-magnetic material that does not affect the magnetic field used for magnetic resonance imaging. Here, the direction from the bed 13 side to the projector 100 side with respect to the Z axis is defined as + Z axis direction, and the direction from the projector 100 side to the bed 13 side is defined as -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 movable screen device 15. FIG. 6 is a front view of the movable screen device 15. FIG. 7 is a perspective view of the adjacent movable screen device 15 and the top plate 131.

  As shown in FIGS. 4 to 7, the movable screen device 15 includes a moving body 61, a screen 63, a support arm 65, a reflector 67, at least one outlet 71, a nozzle 73, and a temperature detector 79. The moving body 61 is separate from or integral with the top plate 131, and is movable along the central axis of the bore 53. For example, the moving body 61 is a structure (moving carriage) that moves along a rail provided on the inner wall of the gantry casing 51. Wheels (not shown) that roll on the rails are attached to the lower part of the moving body 61 in order to improve the running performance on the rails. If the moving body 61 can travel on the rail, it is not always necessary to provide wheels, and the surface that comes into contact with the rail may be formed of a material having a low friction coefficient. When no rail is arranged on the inner wall of the gantry casing 51, the moving body 61 is connected to the top plate 131 and is moved along with the top plate 131 along the central axis of the bore 53. The moving body 61 supports the screen 63 and the support arm 65. The moving body 61 is formed of a non-magnetic material that does not act on a magnetic field, such as a resin.

  As shown in FIG. 7, a subject fixture or a coil 137 is attached to a front portion (+ Z axis direction side) of the top plate 131. The subject fixture 137 fixes the head of the subject P placed on the top plate 131. The subject fixture 137 has a curved shape so that the occiput can be covered without obstructing the field of view of the subject P placed on the top plate 131 with its back. 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. An image from the projector 100 is projected onto the screen 63 from the side opposite to the side where the top plate 131 is inserted into the bore 53. That is, projector 100 is arranged on the opposite side of bed 13 across screen 63. Here, the surface of the screen 63 on the projector 100 side is referred to as a back surface, and the surface on the bed 13 side is referred to as a front surface. In order to project an image on the surface, the screen 63 is preferably made of a translucent material. As such a translucent material, translucent plastic or frosted glass is preferably used. When the screen 63 is formed of 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 front surface. Thus, the subject P and the like can see the image projected on the surface from the bed 13 side via the reflector 67 supported by the support arm 65. The screen 63 may be of a type having a planar shape or a type having a curved surface shape. In the case of having a curved surface shape, it is preferable that the concave surface faces the bed 13, that is, is arranged so as to form a surface. With the concave surface facing the couch 13, the screen 63 can cover the rear periphery of the head of the subject P placed on the top 131. Thereby, the visual field of the subject P can be filled with the image projected on the screen 63, and the image can be immersed in the image. The screen 63 has an outer diameter smaller than a diameter of an inner wall in contact with the bore 53 of the gantry casing 51. By designing the outer diameter to be smaller than the inner diameter in this way, the movable screen device 15 can be inserted into the bore 53.

  As shown in FIGS. 4 to 7, the support arm 65 is attached to the moving body 61. Note that the support arm 65 may be attached to the movable body 61 so as to be slidable in the Z-axis direction. In this case, for example, a slide mechanism 70 that holds both ends of the support arm 65 slidably along the Z-axis direction may be provided in the moving body 61. By the slide mechanism 70, the reflection plate 67 supported at a substantially central portion of the support arm 65 can approach or separate from the screen 63. The support arm 65 supports the reflection plate 67 so as to be arranged in a space on the surface side of the screen 63. When the moving body 61 and the top 131 are adjacent to each other, the reflecting plate 67 is separated from the surface of the moving body 61 and supported so as not to hit the head of the patient P placed on the top 131. 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 outside the gantry 11. In order not to obstruct the field of view of the external observer, the support arm 65 may have a semi-annular or semi-saddle shape having an arc portion along the contour of the screen 63 as shown in FIG. In this case, the support arm 65 is attached to the movable body 61 such that both ends of the support arm 65 are attached to the sides of the movable body 61, and the arc portion of the support arm 65 is located in the space on the surface side of the screen 63. The shape of the support arm 65 is not limited to the above-described semi-annular shape or semi-saddle shape, and may have any shape as long as the reflecting plate 67 can be arranged in a space on the surface side of the screen 63.

  As shown in FIGS. 4 to 7, when the moving body 61 and the top plate 131 are adjacent to each other, the reflection plate 67 does not hit the head of the subject P placed on the top plate 131. Are supported by the support arm 65 at a distance from the surface of the moving body 61. The reflection plate 67 reflects an 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 formed by applying an aluminum vapor deposition process to acryl or a half mirror obtained by attaching a dielectric film may be used. The subject P or the subject P whose head is disposed on the coil 137 can see the image projected on the surface through the reflector 67.

  The reflecting plate 67 is rotatably provided on the support arm 65 in order to manually adjust the angle of the reflecting plate 67. Specifically, it is rotatably provided around a rotation axis RR1 by a rotation mechanism (not shown) provided on the support arm 65. The rotation axis RR1 is provided in parallel with the X axis so that the direction of the reflection plate 67 with respect to the surface of the screen 63 can be adjusted, for example.

  The discharge port 71 is provided in the bore 53 at a position closer to the bed than the screen 63, as shown in FIGS. The discharge port 71 is provided between the screen 63 and the subject fixture or the coil 137, for example, and is provided in the moving body 61. The number of outlets 71 is not limited to two. The discharge port 71 discharges a gas relating to the blow in the bore. The outlet 71 is directed to the curved surface of the screen 63. The discharge port 71 is one end of a nozzle 73 provided in the moving body 61. One end of a blower tube 75 is connected to the other end of the nozzle 73. A blower 250 is connected to the other end of the blower tube 75.

  A blowing direction changing mechanism 77 may be provided between the nozzle 73 and the moving body 61. The blow direction changing mechanism 77 changes the direction of the outlet 71 under the control of the system control circuit 38. Specifically, the blowing direction changing mechanism 77 has a non-magnetic rotation mechanism for rotating the nozzle 73 and a non-magnetic transmission mechanism for transmitting drive to the rotation mechanism. The rotation axis in the rotation mechanism is an arbitrary axis such as an X axis, a Y axis, and a Z axis. RX in FIG. 5 indicates the rotation direction of the nozzle 73 with the X axis as the rotation axis, and RY in FIG. 5 indicates the rotation direction of the nozzle 73 with the Y axis as the rotation axis. The rotation mechanism is realized by a universal joint, at least one rotation joint, or the like. The transmission mechanism transmits the drive generated by a motor or the like under the control of the system control circuit 38 to the rotation mechanism. The transmission mechanism is realized by a belt drive, a chain drive, a flexible shaft, and the like. The rotation mechanism rotates the nozzle 73 by the drive transmitted by the transmission mechanism. Control regarding the direction of the outlet 71 will be described in detail in the operation of the present embodiment.

  FIGS. 8 and 9 are side views of the movable screen device 15 disposed in the bore 53. FIG. 8 and 9, the support arm 65 and the reflection plate 67 are omitted from illustration for easy understanding. As shown in FIG. 8, the blower tube 75 is connected to the outlet 71 via the nozzle 73, and guides gas from the projector to the outlet 71. In FIG. 8, the blower tube 75 penetrates the inside of the moving body 61, but may be mounted on the moving body 61. The gas discharged from the outlet 71 moves along the concave surface of the screen 63 as shown by the broken line in FIG. 8 and heads for the subject P placed on the top 131. Thereby, the air blow in the bore cools the inside of the bore 53 efficiently. Note that the blower tube 75 may be provided inside the top plate 131 so as to guide the gas from the bed to the outlet 71 as shown in FIG. 9. Accordingly, the nozzle 73 may be installed on the top plate 131.

  Temperature detector 79 detects the temperature inside bore 53. The temperature detector 79 outputs data of the detected temperature to the system control circuit 38. As shown in FIGS. 4 to 7, the temperature detector 79 is provided, for example, on the support arm 65 on the back surface of the reflection plate 67. In addition, if the temperature detector 79 is located at a position closer to the couch than the screen 63 and is out of the field of view of the subject P placed on the table 131, for example, the inside of the bore 53 such as the back surface of the reflection plate 67. May be provided at any position.

(motion)
Hereinafter, the temperature control function 381, the discharge direction determination function 383, and the blow control function 385 executed in the present embodiment will be described. The above three functions may be executed independently, or may be executed in any combination.

(Temperature control function)
The temperature control function 381 adjusts the temperature of the gas supplied to the outlet 71 to a temperature equal to or lower than the temperature in the bore 53 based on the temperature in the bore 53 detected by the temperature detector 79. Function. The system control circuit 38 that implements the temperature control function 381 corresponds to a temperature control unit. The system control circuit 38 reads out a program related to the temperature control function 381 from the main storage circuit 37, expands the program in its own memory, and executes it. Specifically, the system control circuit 38 that implements the temperature control function 381 compares the temperature in the bore 53 output from the temperature detector 79 with a predetermined threshold. The predetermined threshold is a temperature in the examination room, a temperature desired by the subject P placed on the top 131, or the like. The predetermined threshold value may be input by the operator via the input circuit 36. If the temperature in the bore 53 exceeds a predetermined threshold, the system control circuit 38 determines a temperature equal to or lower than the temperature in the bore 53 based on the difference between the temperature in the bore 53 and the predetermined threshold. Determined as the temperature of the gas. The system control circuit 38 controls the cooler 251 in order to cool the temperature of the gas used for blowing air in the bore to the determined temperature. The cooler 251 cools the gas temperature to the determined temperature. The blower 250 sends the cooled gas to the outlet 71 via the blower tube 75. The discharge port 71 discharges the cooled gas (cold air).

(Discharge direction determination function)
The discharge direction determining function 383 is a function of determining the direction of the discharge port 71 with respect to the screen 63 according to the imaging target region set for the subject P inserted into the bore 53. The system control circuit 38 that implements the discharge direction determining function 383 corresponds to a discharge direction determining unit. The system control circuit 38 reads out the program related to the discharge direction determination function 383 from the main storage circuit 37, expands it in its own memory, and executes it. Specifically, the system control circuit 38 that implements the discharge direction determination function 383 determines the direction from the position where the nozzle is provided to the imaging target portion as the direction of the discharge port 71. For example, when the imaging target part is the chest, the system control circuit 38 determines the direction of the outlet 71 so that the air blowing direction is substantially the chest of the subject P. Next, the system control circuit 38 drives the motor according to the determined direction of the outlet 71. The blowing direction changing mechanism 77 rotates the outlet 71 by driving a motor, and changes the direction of the outlet 71. Thereby, the gas discharged from the discharge port 71 goes to the imaging target portion.

(Blow control function)
The ventilation control function 385 is a function for controlling the start and stop of the ventilation in the bore. The system control circuit 38 that implements the blower control function 385 corresponds to a blower controller. The system control circuit 38 reads out the program related to the ventilation control function 385 from the main storage circuit 37, expands the program in its own memory, and executes it. Specifically, the system control circuit 38 that implements the air blowing control function 385 controls the air blowing device 250 to start air blowing in the bore in response to the start of movement of the top plate 131 into the bore 53. The blower 250 starts the blow in the bore under the control of the system control circuit 38. In addition, the system control circuit 38 may control the blower 250 to start blowing air in the bore in response to the start of rising of the top plate 131 located below the bore 53. The system control circuit 38 controls the blower 250 to stop the blow in the bore in response to the completion of the movement of the top plate 131 out of the bore 53. The blower 250 stops blowing in the bore under the control of the system control circuit 38. The system control circuit 38 may control the blower 250 in order to stop the blow in the bore in response to the start of the lowering of the top plate 131 below the bore 53. The start of the movement, the completion of the movement, the start of the ascent, and the start of the descent are executed by the input of the operator through the input circuit 36.

  FIG. 10 is a diagram illustrating an example of how the top 131 rises. FIG. 11 shows the movable screen device 15 disposed in the bore 53 immediately before the blow in the bore is started before the test on the subject P or immediately after the blow in the bore is stopped after the test on the subject P. FIG. FIG. 12 is a diagram illustrating an example of a state in which the top plate 131 descends. As shown in FIGS. 10 to 12, the air blowing control function 385 executes the start and stop of the air blowing in the bore according to the relative positional relationship between the top plate 131 and the bore 53.

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 medical image diagnostic apparatus 10 has at least one outlet 71 that is provided in the bore 53 at a position closer to the bed than the screen 63 and that discharges gas related to air blowing in the bore. Thereby, when the mobile screen device 15 is arranged to improve the patient examination space in the bore 53 of the gantry 11, the air can be efficiently blown in the bore. In addition, since the size of the screen 63 in the movable screen device 15 can be made as large as possible near the inner diameter of the bore 53, the image field of view of the subject P placed on the top plate 131 can be widened. it can. Further, since the discharge port 71 can be directed to the screen 63, indirect wind through the screen 63 can be supplied to the subject P.

  In addition, according to the medical image diagnostic apparatus 10 according to the present embodiment, based on the temperature detected by the temperature detector 79, whether the temperature of the gas supplied to the outlet 71 is the same as the temperature in the bore 53? Or lower temperature can be adjusted. Thus, gas having a temperature lower than the temperature of the inspection room 300 can be discharged from the outlet 71. For this reason, even if the peripheral temperature of the subject P in the bore 53 increases due to the radiant heat from the subject P, the subject P can be efficiently cooled, and the temperature environment of the subject P in the bore 53 is reduced. Can be improved.

  Further, according to the medical image diagnostic apparatus 10 according to the present embodiment, the direction of the outlet 71 with respect to the screen 63 is changed according to the imaging target region set for the subject P inserted into the bore 53. Can be. Accordingly, it is possible to blow the air in the bore near the imaging target portion, and it is possible to improve the temperature environment near the imaging target portion.

  In addition, according to the medical image diagnostic apparatus 10 according to the present embodiment, the ventilation in the bore is controlled in response to the start of the movement of the top 131 into the bore 53 or the start of the rise of the top 131 located below the bore 53. After the start, the movement of the top 131 out of the bore 53 is completed, or the blow in the bore can be stopped in response to the start of the downward movement of the top 131 below the bore 53. Thus, the subject P placed on the top plate 131 can be blown in the bore with good timing, and the comfort in the patient examination space can be improved. In addition, the power consumption of the medical image diagnostic apparatus 10 can be reduced.

  From the above, according to the medical image diagnostic apparatus 10 according to the present embodiment, the livability in the bore 53 of the gantry 11 can be improved.

(First Modification)
The difference between the present modification and the present embodiment is that a wind direction control plate is provided at an end of the screen 63. FIG. 13 is a diagram illustrating a side surface of the movable screen device 15 disposed in the bore 53. In FIG. 13, the support arm 65 and the reflection plate 67 are omitted from illustration for easy understanding. As shown in FIG. 13, the wind direction control plate 81 is provided at an upper end of the screen 63. The wind direction control plate 81 changes the moving direction of the gas moved along the screen 63 so as to be directed to the top plate 131. The wind direction control plate 81 is made of, for example, a substantially transparent and non-magnetic material. The installation position of the wind direction control plate 81 on the screen 63 is not limited to the upper end, and may be arranged around the screen.

According to the configuration described above, the following effects can be obtained.
According to the medical image diagnostic apparatus 10 according to the present modification, the direction of air flow in the bore along the screen 63 can be changed to the direction toward the top 131. Thereby, the air in the bore can be more efficiently applied to the subject P as indirect air, and the cooling efficiency for the subject P can be further improved. That is, according to the present modification, the blowing environment in the bore 53 of the gantry 11 can be improved by efficiently using the blowing in the bore.

(Second Modification)
The difference between the present modified example and the present embodiment is that a part of the blower tube 75 is arranged adjacent to the periphery of the screen 63 on the bed or the projector side. Part of the blower tube 75 is substantially transparent and made of a non-magnetic material. FIG. 14 is a perspective view of the movable screen device 15 and the top plate 131. FIG. 15 is a front view of the movable screen device 15. FIG. 16 is a diagram illustrating a side surface of the movable screen device 15 disposed in the bore 53.

  As shown in FIGS. 14 to 16, a part 83 of the blower tube 75 is provided around the screen 63 on the projector side. The discharge port 71 is provided along the outer shape of the screen 63. Note that a plurality of outlets 71 may be provided at predetermined regular intervals or irregular intervals along the outer shape of the screen 63. As shown in FIG. 16, the gas supplied from the blower 250 moves along the periphery 83 of the screen 63 along the part 83 of the blower tube. As shown in FIG. 15, the gas supplied from the blower 250 is discharged from the outlet 71 from the periphery of the screen 63 toward the bed.

According to the configuration described above, the following effects can be obtained.
According to the medical image diagnostic apparatus 10 according to the present modification, a part 83 of the blower tube 75 can be disposed adjacent to the periphery of the screen 63 on the bed or the projector. Thus, the gas supplied from the blower 250 can be discharged from the periphery of the screen 63 toward the bed. That is, according to the present modification, the flow of the air flow in the bore can be directed from the screen 63 toward the bed. From these facts, according to the present modification, the air in the bore can be efficiently ventilated by the air blow in the bore, and the air blowing environment in the bore 53 of the gantry 11 can be improved.

(Third Modification)
The difference between the present modified example and the present embodiment is that the blower tube 75 is disposed in the gantry 11 and the blower tube 75 is moved along the center axis in synchronization with the movement of the moving body 61 by the blower tube movement control function. It is in. FIG. 17 is a diagram illustrating a side surface of the movable screen device 15 disposed in the bore 53. As shown in FIG. 17, the blower tube 75 is disposed inside the gantry casing 51. The moving mechanism 85 supports the blower tube 75 movably along the central axis in synchronization with the movement of the moving body 61. The moving mechanism 85 includes a non-magnetic ball screw, a transmission mechanism for transmitting a rotational drive for rotating a screw shaft of the ball screw, and a motor. The transmission mechanism is, for example, a flexible shaft that connects the rotation shaft of the motor and the screw shaft. The discharge port 71 moves along the central axis with the movement of the blower tube 75.

  FIG. 18 is a diagram showing a system control circuit 38 and a moving mechanism 85 according to the present modification. The blower tube movement control function 387 is a function of controlling the movement mechanism 85 in accordance with the position of the moving body 61 in the bore 53 in order to arrange the discharge port 71 at a position closer to the bed than the screen 63. The system control circuit 38 that implements the blower tube movement control function 387 corresponds to a blower tube movement controller. The system control circuit 38 reads out the program related to the blower tube movement control function 387 from the main storage circuit 37, develops the program in its own memory, and executes it. Specifically, the system control circuit 38 for realizing the blower tube movement control function 387 operates the motor so that the screw shaft is rotated according to the moving distance of the moving body 61 with reference to the end of the bed side bore 53. Control. By this control, the outlet 71 is arranged at a position closer to the bed than 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 modification, by controlling the moving mechanism 85 in accordance with the position of the moving body 61 in the bore 53, the center axis of the blower tube 75 is synchronized with the movement of the moving body 61. Can be moved along. Accordingly, the outlet 71 can be arranged at a position closer to the bed than the screen 63 in synchronization with the movement of the moving body 61. From these facts, according to the present modified example, it is possible to execute the air blowing in the bore while maintaining the relative positional relationship of the discharge port 71 with respect to the screen 63, and it is preferable to set the blowing environment in the bore 53 of the gantry 11. Condition can be maintained.

  According to the medical image diagnostic apparatus of the above-described embodiment and at least one modified example, it is possible to improve the livability in the bore of the gantry 11.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various 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 equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Medical image diagnostic system (magnetic resonance imaging system), 10 ... Medical image diagnostic apparatus (magnetic resonance imaging apparatus), 11 ... Stand, 13 ... Bed, 15 ... Mobile screen device , 17 ... Imaging control unit, 21 ... Gradient magnetic field power supply, 23 ... Transmission circuit, 25 ... Reception circuit, 27 ... Console, 31 ... Imaging control circuit, 32 ... Constituent 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 magnets, 43 ... Gradient magnetic field coils, 45 ... RF coils, 51 ... Base housing, 53 ... Bore, 61 ... Moving body, 63 ... Screen, 65 ..Support arm, 67... Reflector, 70 ..Slide mechanism, 71 ・ ・ ・ Exhaust port, 73 ・ ・ ・ Nozzle, 75 ・ ・ ・ Blower tube, 77 ・ ・ ・ Blower direction changing mechanism, 79 ・ ・ ・ Temperature detector, 81 ・ ・ ・ Wind direction control plate, 83: part of the blower tube, 85: moving mechanism, 100: projector, 131: top plate, 133: base, 135: bed driving device, 137: Sample fixing device or coil, 200: Projector control device, 250: Blower, 251: Cooler, 300: Test room, 381: Temperature control function, 383: Discharge direction Decision function, 385: Blow control function, 387: Blow tube movement control function, 400: Control room, 500: Wall, 510: Window, D1 to D3: Door, RR1 ··Axis of rotation.

Claims (10)

A base formed with a bore and equipped with a medical imaging mechanism,
A bed for moving a top plate along the central axis of the bore,
A moving body that is separate from or integral with the top plate, and that can move along the central axis;
A screen provided on the moving body, on which an image from a projector is projected,
A reflector for reflecting the image projected on the screen,
In the bore, provided at a position closer to the bed than the screen, at least one outlet for discharging gas related to the blower in the bore,
A medical image diagnostic apparatus comprising: A temperature detector for detecting a temperature in the bore;
A temperature controller configured to adjust a temperature of the gas supplied to the outlet to a temperature equal to or lower than a temperature in the bore based on the detected temperature;
The medical image diagnostic apparatus according to claim 1, further comprising: An ejection direction determining unit that determines an orientation of the outlet with respect to the screen according to an imaging target region set for a subject inserted into the bore,
A blowing direction changing mechanism that changes the direction of the discharge port to the determined direction,
The medical image diagnostic apparatus according to claim 1, further comprising: Starting the movement of the top plate into the bore, or in response to the start of the rise of the top plate located below the bore, to start the ventilation in the bore,
The air conditioner further includes a blower control unit configured to stop the blower in the bore in response to completion of the movement of the top plate to the outside of the bore, or a start of lowering of the top plate below the bore.
The medical image diagnostic apparatus according to claim 1. The outlet is directed to the screen,
The medical image diagnostic apparatus according to claim 1. Further provided at the end of the screen, further comprising a wind direction control plate for changing the moving direction of the gas moved along the screen toward the top plate,
The medical image diagnostic apparatus according to claim 1. Further comprising a blower tube connected to the outlet and guiding the gas from the projector side;
The medical image diagnostic apparatus according to claim 1. Further comprising a blower tube connected to the outlet, for guiding the gas from the bed side;
The medical image diagnostic apparatus according to claim 1. The blower tube is disposed in the gantry,
A moving mechanism that moves the blower tube along the central axis in synchronization with the movement of the moving body,
In order to arrange the outlet at a position closer to the bed than the screen, a blower tube movement controller that controls the moving mechanism according to the position of the moving body in the bore,
The medical image diagnostic apparatus according to claim 7, further comprising: Part of the blower tube is disposed adjacent to the periphery of the screen on the bed side or the projector side,
The discharge port discharges the gas from the periphery of the screen toward the bed.
The medical image diagnostic apparatus according to any one of claims 7 to 9.