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Method for adjusting mri superconducting magnet

一种超导磁体、调整方法的技术，应用在测量磁变量、测量装置、仪器等方向，能够解决失超高等问题，达到提高稳定性、减少失超的可能性的效果

Active Publication Date: 2012-05-30
CANON MEDICAL SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, if the MRI is operated with a superconducting magnet under initial conditions, the possibility of quenching is higher

Method used

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  • Method for adjusting mri superconducting magnet
  • Method for adjusting mri superconducting magnet
  • Method for adjusting mri superconducting magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] figure 1 It is a perspective view showing the appearance of the MRI apparatus. Such as figure 1 As shown, the MRI apparatus 1 includes a static magnetic field generator 10 and a sleeping table 30. The static magnetic field generating unit 10 includes a superconducting magnet for MRI described later, and generates a static magnetic field inside the hole 20.

[0033] figure 2 It is a cross-sectional view showing the structure of the superconducting magnet for MRI according to the first embodiment of the present invention. Such as figure 2 As shown, in the MRI superconducting magnet 100 according to the first embodiment of the present invention, a hollow cylindrical vacuum chamber 110 is arranged on the outermost side. The space in the central part of the cylinder of the vacuum chamber 110 becomes a hole 160 corresponding to the hole 20. The inside of the vacuum tank 110 was depressurized by a decompression device not shown in the figure to become a vacuum. The vacuum ch...

Embodiment approach 2

[0089] Since the adjustment method of the MRI superconducting magnet 100 according to the second embodiment of the present invention is different from the adjustment method of the MRI superconducting magnet 100 according to the first embodiment only in the shimming process, it is no longer correct Repeat description for other processes.

[0090] Figure 16 It is a flowchart showing the method of adjusting the superconducting magnet for MRI in the second embodiment of the present invention. Such as Figure 16 As shown, in the present embodiment, the superconducting magnet 100 for MRI is shimmed in an environment that realizes the magnetic field atmosphere of the room 300 as the place of use (S210).

[0091] Specifically, such as Figure 14 , Figure 15 As shown, the superconducting magnet 100 for MIR is shimmed in a factory 600 where the magnetic field atmosphere is the same as the magnetic field atmosphere in the room 300 as the place of use. In this case, since it is possible to ...

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Abstract

A method of the present invention includes: a step of shimming an MRI superconducting magnet in consideration of the magnetic field atmosphere of a use place; a step of generating a rated magnetic field in the MRI superconducting magnet thus shimmed, under an environment in which the magnetic field atmosphere of the use place is realized; and a step of installing the MRI superconducting magnet in the use place after the step of generating the rated magnetic field. This reduces possibility of occurrence of quench and improves stability in the MRI superconducting magnet.

Description

Technical field [0001] The present invention relates to a method for adjusting a superconducting magnet for MRI (magnetic resonance imaging). Background technique [0002] In superconducting magnets for MRI, the static magnetic field in the imaging space is optimized from the design stage, so that the uniformity of the static magnetic field in the imaging space reaches the order of ppm (parts per million). [0003] In actual superconducting magnets for MRI, the uniformity of the static magnetic field is as low as several hundred to several thousand ppm due to manufacturing errors such as dimensional errors and assembly errors of various components. Therefore, as a technique for correcting the non-uniformity of the static magnetic field, shimming is performed. [0004] As a background document that discloses an MRI apparatus capable of shimming, there is Japanese Patent Laid-Open No. 2008-220923. In the MRI apparatus described in Japanese Patent Laid-Open No. 2008-220923, the non-un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/387G01R33/3815
CPCG01R33/3873G01R33/3802Y10T29/49758
Inventor 田边肇
Owner CANON MEDICAL SYST CORP