JP6399551B2 - Dehumidification structure of MRI laboratory - Google Patents

Description

  The present invention relates to a dehumidifying structure of an MRI examination room in which an MRI apparatus (magnetic resonance imaging apparatus) is installed.

  Some hospitals have an MRI examination room where an MRI apparatus is installed. A predetermined part of a subject (patient) is photographed (scanned) with the MRI apparatus and diagnosed by a computer in an MRI operation room in a separate room. It is possible to obtain an MRI image (tomographic image) of the predetermined part useful for the above.

  Since the MRI apparatus has a superconducting magnet for generating a very strong magnetic field, a cooling apparatus for cooling the superconducting magnet to a cryogenic temperature is connected to the MRI apparatus. For this reason, the MRI apparatus itself is also cooled.

  Further, since the MRI apparatus generates a strong magnetic field and radio wave noise during operation, the magnetic field generated by the MRI apparatus does not leak to the outside of the MRI examination room, and there is radio noise from the outside of the MRI examination room. The wall, ceiling, floor, etc. of the MRI examination room are constructed by a member that shields electromagnetic waves (hereinafter referred to as “electromagnetic wave shielding material”) so as not to enter (for example, Patent Document 1).

JP 2000-210265 A

  By the way, when the MRI apparatus is operated from a situation where the MRI examination room is in a hotter and humid environment than usual, the cooling apparatus for cooling the superconducting magnet to a cryogenic temperature cools the MRI apparatus itself and its surroundings. Since the air in the MRI examination room is also cooled, condensation tends to occur on the wall surface made of an electromagnetic shielding material in contact with the other room (such as the MRI apparatus operation room) adjacent to the MRI examination room. When dew condensation occurs on the wall surface of the MRI examination room, rust and mold are generated on the wall surface of the MRI examination room formed by the electromagnetic shielding material.

  A dehumidifier may be installed in the MRI examination room to prevent condensation on the wall or ceiling surface in the MRI examination room, but the radio noise generated from the dehumidifier affects the imaging operation of the MRI system. And may cause noise in the obtained MRI image.

  In addition, a strong magnetic force generated during the operation of the MRI apparatus attracts the MRI apparatus (superconducting magnet) when there are metal products that are not fixed with bolts in the MRI inspection room, so a dehumidifier is installed in the MRI inspection room. It is desirable not to.

  Therefore, an object of the present invention is to provide a dehumidifying structure of an MRI examination room that can dehumidify the MRI examination room without installing a dehumidifier in the MRI examination room.

  In order to solve the above problems, a dehumidifying structure for an MRI examination room according to the present invention is a dehumidifying structure for an MRI examination room for dehumidifying an MRI examination room having a magnetic shielding function in which an MRI apparatus is installed. A dehumidifier installed outside the chamber; a distal end side that opens into the MRI examination chamber; a proximal end side that is connected to the air inlet side of the dehumidifier; and a distal end side that opens into the MRI examination chamber. An exhaust side pipe connected at the base end side to the air exhaust port side of the dehumidifier, and dehumidifying by dehumidifying the dehumidifier by sucking air in the MRI examination chamber through the intake side pipe The dehumidified air is blown out into the MRI examination chamber through the exhaust side pipe.

  According to the present invention, it is possible to dehumidify the air in the MRI examination room without installing a dehumidifier in the MRI examination room, so that it is possible to prevent dew condensation on the wall surface in the MRI examination room and the dehumidifier. It is also possible to prevent radio noise generated from the influence on the imaging operation of the MRI apparatus.

The schematic sectional drawing which shows the dehumidification structure of the MRI test room which concerns on embodiment of this invention. The schematic perspective view which shows the external appearance of a MRI inspection room. The disassembled perspective view of the dehumidifier case which covers a dehumidifier. The perspective view which shows the dehumidifier case which covers a dehumidifier. The expanded sectional view which showed the front end side vicinity of the duct for exhaust.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a schematic sectional view showing a dehumidifying structure of an MRI examination room according to an embodiment of the present invention.

  As shown in FIG. 1, the MRI examination room 2 in which the MRI apparatus 1 is installed is provided in a space partitioned by a wall 3 such as a concrete wall constructed in a building such as a hospital.

  The MRI apparatus 1 is provided in an MRI main body 4 incorporating a superconducting magnet and the like, a bed (bed) 5 on which a subject (patient) A lies, a cooling apparatus 6, and an adjacent MRI apparatus operation room. A computer device having a display device as a control unit (not shown) is provided, and a strong magnetic field is generated in the MRI main body 4, and a predetermined part of the subject A on the bed 5 is imaged by a nuclear magnetic resonance phenomenon ( And a clear MRI image (tomographic image) of the predetermined part useful for diagnosis or the like can be generated and displayed on the display device by a computer device in the operation room of the MRI apparatus in a separate room.

  The cooling device 6 has a function of cooling a superconducting magnet (not shown) in the MRI main body 4 to a cryogenic temperature with liquid helium, etc., and a cooling liquid circulation through a gradient magnetic field coil and the like (not shown) in the MRI main body 4. Has the function of cooling by.

  On the four wall surfaces 2a, the ceiling surface 2b, and the floor surface 2c of the MRI examination room 2, for example, a structure to which a plate-like magnetic shielding material (for example, silicon steel, pure iron, etc.) is attached is installed. Has been built. The wall surface 2a and the ceiling surface 2b are configured by connecting a plurality of panel-like structures. For example, a plate-shaped radio wave shielding material (such as copper) is attached to the structure to shield radio noise. Thus, the MRI examination room 2 has a magnetic shielding function and a radio wave shielding function.

  A decorative plate (not shown) is attached to the indoor surface of each wall surface 2a, and the ceiling plate 7 is attached to the lower side of the ceiling surface 2b so as to be suspended at a predetermined interval. A floor material (not shown) is attached on the floor surface 2c. As shown in FIG. 2, a sliding sliding door 8 is attached to an opening formed on one wall surface of the MRI examination room 2. The sliding door type door 8 is provided with a plate-shaped radio wave shielding material (such as stainless steel) and can shield electromagnetic waves.

  As shown in FIG. 1, a dehumidifier 10 for dehumidifying the inside of the MRI examination room 2 is installed on the outer surface side of the ceiling surface 2 b of the MRI examination room 2.

  As shown in FIGS. 1 and 2, the entire outer surface of the dehumidifier 10 is covered with a rectangular dehumidifier case 11 and is fixed to a case lower surface 11 a (see FIG. 3) in the dehumidifier case 11. . The dehumidifier case 11 is made of, for example, a steel plate. A wall body 3 (see FIG. 1) such as a concrete wall of a building is located above the dehumidifier case 11, and the dehumidifier case 11 is attached by a suspension bolt 12 (see FIG. 1) attached to the wall body 3. Is held in a non-contact state with the outer surface of the ceiling surface 2b. A power cord (not shown), a drain pipe, and the like are connected to the dehumidifier 10.

  In this way, the dehumidifier case 11 with the dehumidifier 10 fixed therein is in a non-contact state with a predetermined gap between the dehumidifier case 11 and the outer surface of the ceiling surface 2b, and therefore when the dehumidifier 10 is dehumidified. It is possible to prevent vibrations from being transmitted into the MRI examination room 2 through the ceiling surface 2b.

  As shown in FIG. 3, the dehumidifier case 11 includes first and second covers 11b and 11c located on both sides of the long side of the case lower surface 11a, and a third unit integrally formed on both sides of the short side of the case lower surface 11a. The fourth covers 11d and 11e and the fifth cover 11f integrally formed on the upper portion of the first cover 11b. The lower portions of the first and second covers 11b and 11c are screwed to both sides of the long side of the case lower surface 11a with the dehumidifier 10 fixed therein, and the distal end side of the fifth cover 11f is screwed to the flange of the second cover 11c. Thereby, as shown in FIG. 4, the dehumidifier case 11 which fixed the dehumidifier 10 inside is obtained.

  The proximal ends of the intake duct 13 and the exhaust duct 14 are connected to the duct connection openings 11g and 11h formed in the third and fourth covers 11d and 11e, respectively. The front end side of the duct 14 opens to the ceiling side in the MRI examination room 2 through a through hole formed in the ceiling surface 2 b and the ceiling plate 7. The proximal end side of the intake duct 13 is connected to the air intake port side of the dehumidifier case 11, and the proximal end side of the exhaust duct 14 is connected to the air exhaust port side of the dehumidifier case 11. The intake duct 13 and the exhaust duct 14 are made of, for example, steel plates.

  FIG. 5 is an enlarged cross-sectional view showing the vicinity of the distal end side (MRI examination room 2 side) of the exhaust duct 14. Since the structure near the front end side of the intake duct 13 is substantially the same, only the exhaust duct 14 side will be described.

  As shown in FIG. 5, a silencer chamber 15 is connected in the middle of the exhaust duct 14, and the duct front end portion 14a side of the exhaust duct 14 is connected to the ceiling plate 7 through a through hole 2d formed in the ceiling surface 2b. It is connected to the periphery of the formed blower outlet 7a. A resin outlet face 16 having a plurality of outlet holes is attached to the outlet 7a. An electromagnetic wave shielding plate 17 having a honeycomb structure for shielding electromagnetic waves is attached to the lower part of the through hole 2d of the ceiling surface 2b.

  The sound deadening chamber 15 is for reducing the operation sound of the dehumidifier 10, and a sound absorbing material, a baffle plate, etc. (not shown) are provided inside in order to enhance the sound deadening effect.

  As described above, since the muffler chamber 15 is provided in the middle of the exhaust duct 14 (intake duct 13), the operation sound emitted from the dehumidifier 10 is reduced, and the electromagnetic shielding plate 17 further reduces the noise from the dehumidifier 10. Leakage of emitted radio noise into the MRI examination room 2 is reduced. The electromagnetic wave shielding plate 17 also reduces leakage of strong radio waves generated when the MRI apparatus 1 is operated to the outside of the ceiling surface 2b.

  The dehumidifier 10 has, for example, an evaporator (not shown), a condenser, a blower fan, and the like inside. In addition, the dehumidifier 10 is using a well-known thing, Description of a detailed structure, operation | movement, etc. is abbreviate | omitted. When the blower fan is rotated by the dehumidifying operation of the dehumidifier 10, the air a in the MRI examination room 2 is taken in from the intake port of the dehumidifier 10 through the intake duct 13, and the air a dehumidified through the evaporator and the condenser a Can be dehumidified from the air outlet face 16 through the exhaust duct 14, the muffler chamber 15, and the duct tip 14 a into the MRI examination room 2. Note that drainage drained by the dehumidifying operation of the dehumidifier 10 is discharged to a drainage tank through a drain pipe (not shown).

  Thus, according to the dehumidifying structure of the MRI examination room of this embodiment, even if the inside of the MRI examination room 2 is in a higher temperature and humidity environment than usual before the operation of the MRI apparatus 1, the MRI examination room 2 When operating the MRI apparatus 1 in the MRI examination room 2 without installing a dehumidifier in the MRI examination room 2 by performing a dehumidifying operation of the dehumidifier 10 installed on the outer surface side of the ceiling surface 2b. The inside air can be dehumidified. Thereby, even if the MRI apparatus 1 (MRI main body 4) itself and its surroundings are cooled by the cooling device 6 that cools the superconducting magnet to a cryogenic temperature, even if the air in the MRI inspection room 2 is cooled, the inside of the MRI inspection room 2 It is possible to prevent condensation on the wall surface 2a.

  Furthermore, according to the dehumidifying structure of the MRI examination room of this embodiment, the dehumidifier 10 is installed on the outer surface side of the ceiling surface 2b, and the dehumidifier 10 is covered with the dehumidifier case 11, and the exhaust duct 14 (for intake air) Since the electromagnetic wave shielding plate 17 is attached in the duct 13), radio noise generated during the dehumidifying operation of the dehumidifier 10 does not leak into the MRI examination room 2. Therefore, radio noise generated from the dehumidifier 10 does not affect the imaging operation of the MRI apparatus 1, and a high-quality MRI image can be obtained.

  In the above-described embodiment, the dehumidifier 10 is installed on the outer surface side of the ceiling surface 2b. However, the present invention is not limited to this. For example, the dehumidifier 10 is installed on the floor outside the wall surface 2a provided with the sliding door type door 8. May be. In the above-described embodiment, the leading end sides of the intake duct 13 and the exhaust duct 14 are connected to the MRI examination room 2 from the ceiling surface 2b side. 2 may be connected.

DESCRIPTION OF SYMBOLS 1 MRI apparatus 2 MRI inspection room 3 Wall body 4 MRI main body 5 Bed 6 Cooling device 7 Ceiling board 10 Dehumidifier 11 Dehumidifier case 12 Suspension bolt (dehumidifier holding member)
13 Intake duct (intake side piping)
14 Exhaust duct (exhaust side piping)
15 Silencer chamber 17 Electromagnetic wave shielding plate

Claims (6)

A dehumidifying structure of an MRI examination room for dehumidifying an MRI examination room having a magnetic shielding function in which an MRI apparatus is installed,
A dehumidifier installed outside the MRI examination room;
An intake side pipe having a distal end side opened in the MRI examination chamber and a proximal end side connected to the air inlet side of the dehumidifier;
An exhaust side pipe having a distal end side opened in the MRI examination chamber and a proximal end side connected to an air exhaust port side of the dehumidifier,
By dehumidifying the dehumidifier, the air in the MRI examination room is sucked through the intake side pipe to perform dehumidification, and the dehumidified air is blown out into the MRI examination room through the exhaust side pipe.
A dehumidifier case that fixes the dehumidifier inside is provided in a non-contact state with respect to the MRI examination room ,
A wall body is located above the dehumidifier case, and the dehumidifier case is provided in a non-contact state with respect to the MRI examination room by a suspension bolt attached to the wall body. Dehumidification structure in the laboratory.   The dehumidifying structure of an MRI examination room according to claim 1, wherein the dehumidifier is installed outside a ceiling surface of the MRI examination room.   The dehumidifier is held by a dehumidifier holding member fixed to a wall formed above the ceiling surface of the MRI examination room, and is in a non-contact state with the ceiling surface of the MRI examination room. The dehumidifying structure of an MRI examination room according to claim 2 characterized by the above-mentioned. The dehumidifier of the MRI examination room according to any one of claims 1 to 3, wherein the dehumidifier is covered with the dehumidifier case.   The dehumidifying structure of the MRI examination room according to any one of claims 1 to 4, wherein a silencer chamber is connected in the middle of the intake side pipe and the exhaust side pipe.   The dehumidifying structure of an MRI examination room according to any one of claims 1 to 5, wherein an electromagnetic wave shielding plate having a plurality of holes is attached inside the intake side pipe and the exhaust side pipe. .