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Superconducting magnet apparatus and nuclear magnetic resonance imaging apparatus

A technology of superconducting magnets and magnetic fields, applied in the direction of superconducting magnets/coils, measuring devices, magnetic objects, etc., can solve the problems of increased number of parts, increased space size, increased weight, etc., to achieve suppression of deformation, suppression of total weight, The effect of stabilizing the magnetic field for high-precision measurement

Inactive Publication Date: 2007-08-15
HITACHI LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the case of the structure of the helium container and the bobbin shown in Reference 1, since the helium container and the support structure supporting the helium container and the bobbin are composed of separate structures, the space size thereof inevitably increases.
[0007] In addition, since the bobbin sandwiches the thin helium container and is supported by the support structure via the supporting member, the electromagnetic force applied to the bobbin cannot be efficiently borne.
Therefore, the bobbin itself must have greater rigidity, and in turn, the bobbin becomes larger, or the number of parts increases due to redundant rigid parts, etc., and its weight will also increase.

Method used

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  • Superconducting magnet apparatus and nuclear magnetic resonance imaging apparatus
  • Superconducting magnet apparatus and nuclear magnetic resonance imaging apparatus
  • Superconducting magnet apparatus and nuclear magnetic resonance imaging apparatus

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no. 1 approach

[0026] FIG. 1 is a diagram showing a schematic configuration example of an MRI apparatus using a superconducting magnet apparatus according to an embodiment of the present invention. Moreover, FIG. 2 is a view showing a vertical cross-section of the superconducting magnet device including the pillar portion of the MRI device in FIG. 1 .

[0027] As shown in FIG. 1, in the MRI apparatus 100, two cylindrical vacuum containers 101, 102 are spaced up and down between each other and arranged approximately symmetrically. Support and connect. A portion sandwiched between the two cylindrical vacuum containers 101 and 102 is a measurement space formed by the MRI apparatus 100 , and the front end portion of a bed 130 on which a patient or the like to be tested is placed can enter and exit the measurement space.

[0028] The insides of the vacuum containers 101 and 102 are kept in a vacuum to prevent the intrusion of heat by conduction and convection. And, as shown in FIG. 2 , inside i...

no. 2 approach

[0041] 4 is a diagram showing an example of a cross-sectional structure when an annular helium container according to a second embodiment of the present invention is cut on a plane perpendicular to the circumferential direction. In addition, in the second embodiment, the basic configurations of the superconducting magnet device 110 and the MRI device 100 are the same as those of the first embodiment. Therefore, in the following description, the same components as in the case of the first embodiment are assigned the same symbols, and descriptions thereof are omitted (the same applies to the following embodiments as well).

[0042] As shown in FIG. 4 , in this embodiment, the shield bobbin 4 is formed integrally with the thick plate 5 by casting or the like, but the main bobbin 2 is formed separately. Furthermore, the main bobbin 2 is connected to the shield bobbin 4 by means of fixing metal fittings 10 etc. which are bolted, and further, is attached to the thick plate 5 via the...

no. 3 approach

[0047] 5 is a diagram showing an example of the internal structure of an annular helium container according to a third embodiment of the present invention, (a) is an example of a cross-sectional structure when the annular helium container is cut on a plane perpendicular to the circumferential direction, ( b) is a perspective view when a shield bobbin and a main bobbin are disassembled, and a perspective view after connecting them. In addition, in FIG. 5( b ), the uppermost figure is a figure showing the shield bobbin 4 , and the middle figure is a figure showing the main bobbin 2 . In addition, the figure of the lowest layer is a figure which shows the main bobbin 2 and the shield bobbin 4 after connection.

[0048] In this embodiment, as shown in FIGS. 5( a ) and ( b ), a plurality of (for example, six) protrusions 2 a are formed at predetermined intervals in the circumferential direction on the outer periphery of the main bobbin 2 . In addition, on the surface of the equato...

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Abstract

The invention provides an MRI device wherein the deformations caused at welding and the deterioration of current-carrying performance of a superconducting coil due to heat are restrained, and further the height in vertical direction and weight are suppressed. A superconducting magnet device 110 includes two circle-like helium vessels 7 substantially symmetrically, vertically arranged to have a space therebetween. Each of vessels contains a main coil 1 for generating a measuring magnetic field and a shield coil 3 for generating a magnetic field for suppressing leak to the outside of the measuring magnetic field, together with a liquid helium. At a center part of a symmetrical plane between the vessels, a uniform measuring magnetic field is generated. An opposite surface of a surface facing the symmetrical plane of the circle-like helium vessel 7 is made of a thick plate 5 acting as a structural supporting member. A shield coil bobbin 4 containing the shield coil 3 is supported by the thick plate 5. A main coil bobbin 2 housing the main coil 1 is supported by the thick plate 5 and the shield coil bobbin 4.

Description

technical field [0001] The present invention relates to a superconducting magnet device and a nuclear magnetic resonance imaging device (hereinafter abbreviated as MRI (Magnetic Resonance Imaging) device) using the superconducting magnet device. Background technique [0002] In recent years, open-type MRI apparatuses that do not give patients such as subjects a sense of closure have become popular. In an open MRI apparatus, annular helium containers filled with liquid helium are symmetrically provided above and below a space in which a subject is placed, and a bobbin (coil bobbin) on which a superconducting coil is wound is accommodated therein. [0003] In such an MRI apparatus, generally, a support structure is used to support the coil bobbin, and the entire support structure and the coil bobbin are covered with a helium container. In the case of such a structure, it is necessary to increase the size of the space. At this time, since the bobbin and the supporting structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F6/00A61B5/055
CPCG01R33/3815G01R33/3806G01R33/421
Inventor 渡边洋之川村淳千叶知雄山崎美淑泷泽照广
Owner HITACHI LTD
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