Permanent magnet device for magnetic resonance analysis

A permanent magnet, magnetic resonance technology, applied in the direction of magnets, measuring devices, magnetic objects, etc., can solve problems such as coil heating

Active Publication Date: 2015-11-11
SHANGHAI UNIV OF MEDICINE & HEALTH SCI +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the problems in the prior art, the purpose of the present invention is to provide a permanent magnet dev

Method used

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  • Permanent magnet device for magnetic resonance analysis
  • Permanent magnet device for magnetic resonance analysis
  • Permanent magnet device for magnetic resonance analysis

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Embodiment Construction

[0018] The above solution will be further described below in conjunction with specific embodiments. It should be understood that these examples are used to illustrate the present invention and not to limit the scope of the present invention. The implementation conditions used in the examples can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not indicated are usually the conditions in routine experiments.

[0019] see figure 1 , as an embodiment of the present invention, a permanent magnet device for magnetic resonance analysis is provided, which includes a yoke 1, a magnetic pole plate 2, a guide iron 3 and a shim coil plate 4. In this example, four yokes 1 are surrounded by Closed magnet circuit, a pair of symmetrical magnetic pole plates 2 are fixed on the yoke iron 1, the magnetic pole plates 2 are located in the magnet circuit, the shim coil plate 4 is fixed on the magnetic pole plate 2 through the guide iron ...

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Abstract

The invention discloses a permanent magnet device for magnetic resonance analysis. The permanent magnet device comprises a yoke, magnet pole plates, guide iron and shimming coil plates; one pair of symmetrical magnet pole plates are fixed to the yoke; the yoke encloses a closed magnet loop, and the magnet pole plates are located in the magnet loop; the shimming coil plates are fixed on the magnet pole plates through the guide iron; heating resistors are fixed onto the yoke; the heating resistors are connected with a constant temperature control power source; and the magnet pole plates are provided with temperature sensors; the permanent magnet device further comprises a PID constant temperature control system for regulating the current of the heating resistors to control the uniformity of a magnetic field; the temperature sensors are connected with the PID constant temperature control system; the shimming coil plates, a shimming power source group and an automatic shimming adjustment system are connected with the PID constant temperature control system; and the PID constant temperature control system adjusts the operating current of the heating resistors according to the compensation current of the shimming coil plates. With the permanent magnet device for magnetic resonance analysis provided by the invention adopted, the problem of deterioration of the stability of the magnetic field caused by magnet temperature variation which is further caused by heat emission increase of coils can be solved.

Description

technical field [0001] The invention relates to a permanent magnet device for magnetic resonance analysis. Background technique [0002] Magnet is a key component in all NMR systems, even called the heart; its main technical indicators include uniformity, stability, and uniform area range; currently, superconducting magnets and permanent magnets are mainly used as NMR magnets. Superconducting magnets are expensive, and there are certain differences in the uniformity and stability of permanent magnets. Therefore, permanent magnets need to be shimmed. There are several methods for shimming. The first is the magnet design, and the second is the control of the magnet process (including the uniformity of the magnet particles, the uniformity of the magnetization angle, the uniformity of the sintering temperature of the magnet, smoothness of the surface of the magnetic steel), mechanical shimming (mainly to adjust the parallelism and concentricity of the magnetic steel), passive s...

Claims

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Application Information

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IPC IPC(8): G01R33/383H01F7/00
Inventor 汪红志杨培强陈珊珊夏天刘利荣
Owner SHANGHAI UNIV OF MEDICINE & HEALTH SCI
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