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
View PDF7 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Permanent magnet device for magnetic resonance analysis
  • Permanent magnet device for magnetic resonance analysis
  • Permanent magnet device for magnetic resonance analysis

Examples

Experimental program
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap