JP2011167468A - Mri apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an MRI apparatus which can save labor for piping of a cooling tube. <P>SOLUTION: The MRI apparatus includes a top plate 71 on which a subject P is placed, a rail 73 arranged so as to pass through an opening 11 provided on a rack 10 for introducing the top plate 71 into the opening 11, a frame 74 inside of which the rail 73 is supported and a channel is formed, and a cooling part 80 to cool the rack 10. The cooling part 80 discharges air, which rises in temperature on the rack 10, through the frame 74 and the cooling tube arranged on outside of the rack 10 connected to the frame 74. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an MRI apparatus having a function of cooling a gantry that generates a magnetic field.

  An MRI (Magnetic Resonance Imaging) apparatus performs imaging by sending a subject placed on a top plate into an opening provided in a gantry that generates a magnetic field. In this imaging, a subject in a static magnetic field and a gradient magnetic field is irradiated with RF (Radio Frequency) waves from a high-frequency coil to excite hydrogen nuclear spins, and RF waves emitted from the hydrogen nuclei by this excitation are emitted by a high-frequency coil. Receive and detect magnetic resonance (MR) signals. Then, image data is generated based on the detected MR signal. In this way, image data can be obtained without being invasive to a subject and not being affected by bone or air, which is indispensable in today's field of image diagnosis.

  By the way, the frame is covered with a cover except for the opening, and the cover has many heat-generating parts related to imaging. Then, the ambient temperature rises due to the heat-generating component, and there is a risk of giving uncomfortable feeling to the subject sent into the opening. In order to solve this problem, there is known an MRI apparatus capable of preventing the temperature in the opening from rising due to heat generated by a high-frequency coil that irradiates an RF wave (see, for example, Patent Document 1).

  In this MRI apparatus, the high-frequency coil in the gantry and the gantry are arranged outside the gantry through the duct formed in the rail for guiding the top plate into the opening and the extension duct arranged outside the gantry connected to the duct. Fans are communicating. The fan discharges the air whose temperature rises in the high frequency coil to the outside of the gantry and cools it, thereby preventing the temperature of the air in the opening from rising due to the heat from the high frequency coil.

  In addition, there is an MRI apparatus in which an opening and a fan arranged outside the gantry communicate with each other via a duct hose arranged outside the gantry. In this apparatus, the temperature rise in the opening is prevented by the fan discharging the air that rises in temperature in the opening due to the heat from the inside of the gantry and cooling it out of the gantry.

JP 2009-142647 A

  However, various units are arranged on the gantry, and it is necessary to connect cooling pipes such as extension ducts and duct hoses while avoiding the units. For this reason, there is a problem that labor is required for piping of the cooling pipe.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an MRI apparatus that can reduce the labor required for piping of a cooling pipe.

  In order to solve the above-described problems, an MRI apparatus according to the present invention is an MRI apparatus including a gantry that generates a magnetic field with respect to a subject. And a frame for supporting the rail, and a cooling means for cooling the frame via a cooling pipe disposed outside the frame and the frame connected to the frame.

  According to the present invention, a cooling pipe disposed outside the pedestal is connected to a frame that supports a rail that guides the top plate in the opening of the gantry, and the cooling pipe is cooled via the cooling pipe and the frame. The labor required for the piping can be reduced.

The block diagram which shows the structure of the MRI apparatus which concerns on the Example of this invention. The figure which shows an example of a structure of the bed part which concerns on the Example of this invention. The figure which shows an example of the structure of the flame | frame which concerns on the Example of this invention. The figure which shows the detail of a structure of the 1st flame | frame and 1st cooling part which concerns on the Example of this invention. The figure which shows the detail of a structure of the 2nd flame | frame and 2nd cooling part which concerns on the Example of this invention. The figure which shows the detail of a structure of the 3rd flame | frame and 3rd cooling part which concerns on the Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  Embodiments of the MRI apparatus according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a block diagram showing a configuration of an MRI apparatus according to an embodiment of the present invention. The MRI apparatus 100 includes an gantry 10 that generates a magnetic field for a subject P, a power supply unit 20 that supplies electric power for generating a magnetic field to the gantry 10, and an MR signal based on the magnetic field generated by the gantry 10. A high-frequency coil unit 19 that detects the MR signal, a transmission / reception unit 30 that receives the MR signal detected by the high-frequency coil unit 19, and a data processing unit 40 that generates image data based on the MR signal received by the transmission / reception unit 30. I have.

  Further, the MRI apparatus 100 includes a display unit 50 that displays image data generated by the data processing unit 40, an operation unit 60 that inputs various commands, and a bed unit on which the subject P is movably mounted. 70, a cooling unit 80 that cools the gantry 10 via the bed unit 70, and a power supply unit 20, a transmission / reception unit 30, a data processing unit 40, a bed unit 70, and a cooling unit based on an input signal from the operation unit 60 And a system control unit 90 for controlling 80.

  The gantry 10 has a cylindrical opening 11 penetrating in the horizontal direction into which the subject P is sent, and includes a magnet 12 that generates a static magnetic field disposed on the outer periphery of the opening 11, and the opening 11 and the magnet 12. A gradient coil unit 13 for generating a gradient magnetic field disposed between them, a high-frequency coil unit 14 such as a whole body coil for generating an RF magnetic field disposed between the opening 11 and the gradient coil unit 13, and a magnet 12, a gradient coil unit 13, and a cover 15 that covers the high-frequency coil unit 14.

  For example, a superconducting magnet is used as the magnet 12, and a uniform static magnetic field is generated with respect to the subject P sent into the opening 11. The gradient coil unit 13 generates a gradient magnetic field in the static magnetic field generated by the magnet 12. The high-frequency coil unit 14 generates an RF magnetic field by irradiating the subject P with pulsed RF waves for exciting the hydrogen nuclei.

  The power supply unit 20 is based on a control signal supplied from the system control unit 90, and a magnetic field power supply 21 that supplies power for generating a static magnetic field to the magnet 12 of the gantry 10, and a gradient magnetic field to the gradient magnetic field coil unit 13. Is provided with a gradient magnetic field power supply 22 for supplying electric power for generating.

  The high frequency coil unit 19 is, for example, a head coil disposed in the vicinity of the subject P, and receives an RF wave emitted from the subject P in response to the irradiation of the RF wave from the high frequency coil unit 14 of the gantry 10. An MR signal is detected. Then, the detected MR signal is output to the transmission / reception unit.

  The transmission / reception unit 30 includes a transmission unit 31 including a substrate having a reference signal oscillator, a modulator, a power amplifier, and the like that supply a drive signal for irradiating the RF coil unit 14 of the gantry 10 with pulsed RF waves, and a high-frequency coil unit. And a receiving unit 32 that receives and processes MR signals from 19. The receiving unit 32 includes a substrate having an amplifier, an intermediate frequency converter, a phase detector, a filter, an A / D converter, and the like, and a high frequency is supplied according to the supply of the drive signal to the high frequency coil unit 14 of the transmitting unit 31. The MR signal detected by the coil unit 19 is received. The received MR signal is output to the data processing unit 40 after being subjected to processing such as intermediate frequency conversion, phase detection, filtering, and further A / D conversion.

  The data processing unit 40 reconstructs the MR signal output from the reception unit 32 of the transmission / reception unit 30 to generate image data, and outputs the generated image data to the display unit 50.

  The display unit 50 includes a CRT or a liquid crystal panel, and displays the image data output from the data processing unit 40. The operation unit 60 includes various input devices such as a switch, a keyboard, and a mouse, and a display panel. The operation unit 60 inputs an imaging condition for generating image data of the subject P, and the subject P opens the opening 11 of the gantry 10. Input for sending in.

  FIG. 2 is a diagram illustrating an example of the configuration of the bed unit 70. The bed unit 70 includes a top plate 71 on which the subject P is placed, a support table 72 disposed on a floor surface that supports the top plate 71 so as to be movable in the vertical direction and the longitudinal direction, and the top plate 71. A rail 73 that leads into the opening 11 of the gantry 10 and a frame 74 that supports the rail 73 are provided.

  The top plate 71 is movably disposed on the support base 72 and the rail 73, and is positioned on the support base 72 disposed on the front side of the gantry 10 at the home position. Then, when the maximum movement is made along the rail 73 in the direction of the opening 11, one end penetrates the opening 11 so that imaging can be performed over the whole body of the subject P or a wide range close to the whole body. The other end is formed in a length that is located on the support base 72.

  The support base 72 supports the top plate 71 at the home position so as to be movable in the vertical direction and the longitudinal direction. Then, the top 71 is moved from the home position toward the opening 11 based on the control signal from the system control unit 90, and the other end of the top 71 is at the position where the top 71 has moved maximum in the direction of the opening 11. Support.

  The rail 73 is disposed through the opening 11. One end portion is positioned in the vicinity of the support base 72 on the front side of the gantry 10, and the central portion is supported by a portion forming the opening 11 in the cover 15 of the gantry 10. The other end penetrates through the opening 11 and is located on the back side of the gantry 10 and is supported by the frame 74.

  The rail 73 has a hollow portion 731, an opening 732 communicating with the hollow portion 731 provided on the lower surface of the other end supported by the frame 74, and a hollow portion 731 provided on the lower surface in the opening portion 11. An opening 733 in communication with the. The hollow portion 731 communicates with the frame 74 through the opening 732 and communicates with the high-frequency coil unit 14 in the gantry 10 through the opening 733.

  The cooling unit 80 in FIG. 1 includes first to third cooling units 81 to 83 that cool the gantry 10. The first cooling unit 81 includes a cooling pipe 811 arranged outside the gantry 10 connected to the frame 74 of the bed unit 70, communication pipes 812 and 813 arranged in the gantry 10, a cooling pipe 811, a frame 74 and a fan 814 that cools the inside of the opening 11 of the gantry 10 via the communication pipes 812 and 813.

  The second cooling unit 82 includes a cooling pipe 821 disposed outside the gantry 10 connected to the frame 74 of the bed unit 70, a communication pipe 822 disposed within the gantry 10, a cooling pipe 821, the frame 74, And a fan 823 that cools the substrate of the transmission / reception unit 30 disposed in the gantry 10 via the communication pipe 822.

  Further, the third cooling unit 83 includes a cooling pipe 831 disposed outside the gantry 10 connected to the frame 74 of the bed unit 70, a communication pipe 832 disposed within the gantry 10, a cooling pipe 831, the frame 74, A fan 833 that cools the high-frequency coil unit 14 of the gantry 10 via the communication pipe 832 and the rail 73 of the bed part 70 is provided.

  The system control unit 90 includes a CPU and a storage circuit, and controls each unit of the power supply unit 20, the transmission / reception unit 30, the data processing unit 40, the bed unit 70, and the cooling unit 80 based on an input signal from the operation unit 60. And control the entire system. And the electric power supply timing to the gradient magnetic field coil unit 13 of the gradient magnetic field power supply 22 in the power supply part 20 is controlled. Further, the timing for supplying the drive signal to the high frequency coil unit 14 of the transmitter 31 in the transmitter / receiver 30 and the timing for receiving the MR signal of the receiver 32 are controlled.

Hereinafter, the configuration of the bed unit 70 and the cooling unit 80 will be described in detail with reference to FIGS. 1 to 6.
FIG. 3 is a diagram showing an example of the configuration of the frame 74. The frame 74 is disposed on the floor surface on the back side of the gantry 10 and has, for example, a hollow tubular shape, and the first to third frames 75 to 77 and two frames formed as flow paths through which the air flows. A fourth frame 78, 79 and the like are configured.

  The first frame 75 has a central portion 751 disposed horizontally on the floor surface perpendicular to the longitudinal direction of the top plate 71 and one end connected to one end of the central portion 751 disposed perpendicular to the floor surface. Part 752 and the other end part 753 with one end connected to the other end of the central part 751 arranged perpendicular to the floor surface. Then, both end portions of the central portion 751 opposite to the opening portion 11 side of the gantry 10 are joined to the second and third frames 76 and 77. In addition, an end surface located at a height near the opening 11 of the one end portion 752 is joined to the fourth frame 78, and an end surface located at the same height as the one end portion 752 end surface of the other end portion 753 is joined to the fourth frame 79. It is joined to.

  The second frame 76 is disposed on the side opposite to the opening 11 side of the first frame 75, and is disposed perpendicular to the floor surface with a T-shaped one end portion 761 disposed on the floor surface. The central portion 762 whose one end is connected to one end of the one end portion 761 and the central portion 751 of the first frame 75 are arranged in parallel, and the upper surface is positioned at the same height as the end surface of the one end portion 752 of the first frame 75. The other end portion 763 having one end connected to the other end of the central portion 762 is configured. A part of the side surface of the one end portion 761 on the opening 11 side is bonded to the first frame 75, and one upper surface end of the other end portion 763 is bonded to the fourth frame 78. Further, the end surface of the other end 763 is joined to the third frame 77.

  The third frame 77 is disposed on the side opposite to the opening 11 side of the first frame 75, has an L-shaped one end 771 disposed on the floor surface, and a central portion 762 of the second frame 76. The other end portion 772 is arranged in parallel with the other end portion 772 and is located at the same height as the end surface of the other end portion 753 of the first frame 75 and continues to one end of the one end portion 771. The side surface of the one end portion 771 on the opening 11 side is joined to the first frame 75, and the end surface of the other end portion 772 is joined to the fourth frame 79.

  The fourth frame 78 is disposed horizontally on the first and second frames 75 and 76 and perpendicular to the other end 763 of the second frame 76, and has a through hole at one end. . The lower surface at one end is bonded to the first frame 75, and the lower surface near the center is bonded to the second frame 76. The fourth frame 79 is disposed horizontally on the first and third frames 75 and 77 and perpendicular to the other end 763 of the second frame 76, and has a through hole at one end. ing. The lower surface at one end is bonded to the first frame 75, and the lower surface near the center is bonded to the third frame 77. A rail 73 is fixed on the fourth frames 78 and 79.

  FIG. 4 is a diagram showing details of the configuration of the first frame 75 and the first cooling unit 81. The first frame 75 has a first opening 754 provided on a side surface opposite to the opening 11 side of the central portion 751, a through hole of the fourth frames 78 and 79, one end portion 752, Second openings 755 and 756 are provided on the end surface of the other end 753. The first and second openings 754, 755, and 756 communicate with each other through a flow path 757 formed in the first frame 75.

  The cooling pipe 811 of the first cooling unit 81 has one end connected to the first opening 754 of the first frame 75 and the other end separated from the gantry 10 so that the gantry 10 and the bed unit 70 are arranged. It is connected to a fan 814 arranged inside the shield room or outside this magnetic shield room. And the cooling pipe 811 is arrange | positioned so that piping on the floor surface (or the inside of the pit dug in the floor) can be carried out linearly in the base 10 vicinity. The communication pipe 812 has one end connected to the second opening 755 of the first frame 75 and the other end arranged in the opening 11. Further, the communication pipe 813 has one end connected to the second opening 756 of the first frame 75 and the other end arranged in the opening 11. By the communication pipes 812 and 813, the opening 11 of the gantry 10 and the flow path 757 of the first frame 75 are communicated.

  The first frame 75, one end of the cooling pipe 811 of the first cooling unit 81, and the communication pipes 812 and 813 are disposed inside the cover 15 of the gantry 10. Further, a portion other than one end of the cooling pipe 811 and the fan 814 are arranged outside the cover 15.

  In this manner, the flow path 757 communicating with the opening 11 is formed in the first frame 75 that supports the rail 73, and the first opening 754 communicating with the flow path 757 is provided in the first frame 75. By connecting the cooling pipe 811 to the first opening 754, piping can be easily performed. Thereby, the effort concerning piping can be reduced.

  Further, by providing the first opening 754 on the side surface of the first frame 75 opposite to the opening 11 side, the cooling pipes 811 can be arranged in an orderly manner in a straight line. Thereby, the floor area required for the cooling pipe 811 in the vicinity of the gantry 10 can be reduced, and a passage for accessing the subject P can be secured, so that workability can be improved.

  Here, the fan 814 sucks air at a position away from the gantry 10, for example, and feeds it into the other end of the cooling pipe 811. The supplied air passes through the cooling pipe 811, the first opening 754, the flow path 757, the second openings 755 and 756, and the communication pipes 812 and 813 from the back side of the gantry 10 to the opening 11. Sent in. As a result, the air in the opening 11 whose temperature rises due to heat transmitted from the gradient coil unit 13 or the high-frequency coil unit 14 of the gantry 10 is discharged out of the opening 11 from the front side of the gantry 10. In this way, by supplying the air at a position away from the gantry 10 into the opening 11, it is possible to prevent the temperature inside the opening 11 from rising.

  FIG. 5 is a diagram showing details of the configuration of the second frame 76 and the second cooling unit 82. The second frame 76 is disposed in the vicinity of the case 43 covering the first opening 764 provided on the side surface of the one end 761 opposite to the opening 11 side of the gantry 10 and a part of the substrate of the transmitting / receiving unit 30. A plurality of second openings 765 provided on the lower surface of the other end portion 763 and a third opening 766 provided on the other portion of the side surface of the one end portion 761 on the opening portion 11 side. The first to third openings 764 to 766 communicate with each other through a flow path 767 formed in the second frame 76.

  The cooling pipe 821 of the second cooling unit 82 has one end connected to the first opening 764 of the second frame 76 and the other end spaced apart from the gantry 10 and arranged in or outside the magnetic shield room. It is connected to the. In the vicinity of the gantry 10, the cooling pipe 821 is piped on the floor surface (or in the pit dug in the floor) so as to be arranged linearly along with the cooling pipe 811 of the first cooling unit 81. In addition, the communication pipe 822 has one end connected to the third opening 766 of the second frame 76 and the other end part of the substrate of the transmission / reception unit 30 disposed on the outer peripheral side surface of the magnet 12 inside the cover 15 of the gantry 10. Is connected to the case 44 covering the. By this communication pipe 822, the case 44 communicates with the flow path 767 of the second frame.

  The second frame 76, one end of the cooling pipe 821 of the second cooling unit 82, and the communication pipe 822 are disposed inside the cover 15 of the gantry 10. Further, the part other than one end of the cooling pipe 821 and the fan 823 are arranged outside the cover 15.

  As described above, the second opening 765 is provided in the vicinity of the case 43 of the second frame 76 that supports the rail 73, and the flow path 767 that communicates with the second opening 765 and the case 44 is provided in the second frame 76. By forming the first opening 764 that is formed and communicated with the flow path 767 in the second frame 76 and connecting the cooling pipe 821 to the first opening 764, piping can be easily performed. Thereby, the effort concerning piping can be reduced.

  Further, by providing the first opening 764 on the side surface opposite to the opening 11 side of the second frame 76, the cooling pipes 821 can be arranged in a straight line orderly. Thereby, the floor area required for the cooling pipe 821 in the vicinity of the gantry 10 can be reduced, and a passage for accessing the subject P can be secured, so that workability can be improved.

  Here, the fan 823 sucks air in the other end of the cooling pipe 821, for example. By this suction, air outside the gantry 10 is sucked into the case 44, and air whose temperature rises by the substrate in the case 44 is communicated with the communication pipe 822, the third opening 766, the flow path 767, and the first opening 764. And the cooling pipe 821 to be discharged from the fan 823. In addition, air outside the gantry 10 is sucked into the case 43, and air whose temperature rises inside the case 43 passes through the second opening 765, the flow path 767, the first opening 764, and the cooling pipe 821. The fan 823 is discharged.

  Thus, by cooling the cases 43 and 44, it is possible to prevent the temperature of the air in the opening 11 from rising due to the heat transmitted from the cases 43 and 44.

  FIG. 6 is a diagram showing details of the configuration of the third frame 77 and the third cooling unit 83. The third frame 77 includes a first opening 773 provided on a side surface of the one end 771 opposite to the opening 11 side of the mount 10 and a second opening provided near the center of the other end 772. An opening 774 is provided. The first opening 773 and the second opening 774 are communicated with each other through a flow path 775 formed in the third frame 77.

  The cooling pipe 831 of the third cooling unit 83 has one end connected to the first opening 773 of the third frame 77 and the other end connected to the fan 833. In the vicinity of the gantry 10, the cooling pipe 831 is linearly arranged on the floor surface (or in the pit dug in the floor) side by side with the cooling pipes 811 and 821 of the first and second cooling units 81 and 82. Piping is possible. The communication pipe 832 has one end connected to the opening 732 of the rail 73 in the bed portion 70 and the other end connected to the second opening 774 of the third frame 77. The high frequency coil unit 14 of the gantry 10 communicates with the flow path 775 of the third frame 77 through the communication pipe 832 and the rail 73.

  The third frame 77, one end of the cooling pipe 831 of the third cooling unit 83, and the communication pipe 832 are arranged inside the cover 15 of the gantry 10. Further, the part other than one end of the cooling pipe 831 and the fan 833 are arranged outside the cover 15.

  In this manner, the flow path 775 that communicates with the high-frequency coil unit 14 is formed in the third frame 77 that supports the rail 73, and the first opening 773 that communicates with the flow path 775 is provided in the third frame 77. By connecting the cooling pipe 831 to the first opening 773, piping can be easily performed. Thereby, the effort concerning piping can be reduced.

  Further, by providing the first opening 773 on the side surface opposite to the opening 11 side of the third frame 77, the cooling pipe 831 can be arranged in a straight line orderly. Thereby, the floor area required for the cooling pipe 831 in the vicinity of the gantry 10 can be reduced and a passage for accessing the subject P can be secured, so that workability can be improved.

  Here, the fan 833 sucks air in the other end of the cooling pipe 831, for example. Due to this suction, the air whose temperature rises by each element in the high-frequency coil unit 14 becomes the opening 733, the hollow portion 731, the opening 732, the communication tube 832, the second opening 774, the flow path 775, and the first opening of the rail 73. 773 and the cooling pipe 831 to be discharged from the fan 833.

  Thus, by cooling the high frequency coil unit 14, it is possible to prevent the temperature of the air in the opening 11 from rising due to the heat transmitted from the high frequency coil unit 14.

  According to the embodiment of the present invention described above, the flow path 757 communicating with the opening 11 is formed in the first frame 75 that supports the rail 73 and the first opening 754 communicating with the flow path 757. Is provided in the first frame 75, and the cooling pipe 811 is connected to the first opening 754, whereby piping can be easily performed. A second opening 765 is provided in the vicinity of the case 43 of the second frame 76 that supports the rail 73, and a flow path 767 that communicates with the second opening 765 and the case 44 is formed in the second frame 76. Further, the first opening 764 communicating with the flow path 767 is provided in the second frame 76, and the cooling pipe 821 is connected to the first opening 764, so that piping can be easily performed. Furthermore, a flow path 775 that communicates with the high-frequency coil unit 14 is formed in the third frame 77 that supports the rail 73, and a first opening 773 that communicates with the flow path 775 is provided in the third frame 77. By connecting the cooling pipe 831 to one opening 773, piping can be easily performed. As described above, the labor required for piping can be reduced.

  Further, by providing the first openings 754, 764, 773 on the side surface opposite to the opening 11 side of the first to third frames 75, 76, 77, the cooling pipes 811, 821, 831 are linear. Can be arranged neatly. As a result, the floor area required for the cooling tubes 811, 821, and 831 in the vicinity of the gantry 10 can be reduced and a passage for accessing the subject P can be secured, so that workability can be improved.

P subject 10 gantry 11 opening 12 magnet 13 gradient coil unit 14, 19 high frequency coil unit 15 cover 20 power supply unit 21 static magnetic field power supply 22 gradient magnetic field power supply 30 transmission / reception unit 40 data processing unit 70 bed unit 71 top plate 72 support stand 73 Rail 74 Frame 80 Cooling unit 81 First cooling unit 82 Second cooling unit 83 Third cooling unit

Claims (7)

In an MRI apparatus equipped with a gantry that generates a magnetic field for a subject,
A rail for guiding the top plate on which the subject is placed into the opening;
A frame that supports the rail;
An MRI apparatus comprising: a cooling means for cooling the gantry through the frame and a cooling pipe disposed outside the gantry connected to the frame.   The MRI apparatus according to claim 1, wherein the frame has a hollow tubular shape, and the hollow is formed as a flow path.   The rail is disposed through the opening, one end is positioned in the vicinity of the support base that movably supports the top plate, and the other end penetrates from the opening and is supported by the frame. The MRI apparatus according to claim 1, wherein the MRI apparatus is characterized in that: A magnetic field generating means disposed in the gantry for generating a magnetic field for the subject on the top plate guided into the opening, and a first opening provided in the frame communicating with the flow path Have
The cooling means is connected to the flow path communicating with the opening, the first opening, and the first opening for the air in the opening that rises in temperature due to heat from the magnetic field generating means. The MRI apparatus according to claim 3, wherein the MRI apparatus is discharged through a cooling pipe. A high-frequency coil unit disposed in the gantry for generating an RF magnetic field for the subject on the top plate guided into the opening, and a first frame provided in the frame communicating with the flow path Has an opening,
The cooling means includes a hollow portion communicating with the high-frequency coil formed in the rail with air rising in temperature in the high-frequency coil unit, the flow path communicating with the hollow portion, the first opening, and the The MRI apparatus according to claim 3, wherein the MRI apparatus is discharged through the cooling pipe connected to the first opening. Transmission / reception including a substrate for generating a drive signal for generating an RF magnetic field for the subject on the top plate guided into the opening and receiving an MR signal detected in response to the generation of the RF magnetic field Means, and first and second openings provided in the frame communicating with the flow path,
The cooling means is connected to the second opening, the flow path, the first opening, and the first opening for increasing the temperature by the substrate disposed in the vicinity of the second opening. The MRI apparatus according to claim 3, wherein the MRI apparatus is discharged through the cooling pipe.   The MRI apparatus according to claim 4, wherein the first opening is provided on a side surface of the frame opposite to the opening portion side.

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