Permanent magnet used for nuclear magnetic resonance imager

A nuclear magnetic resonance imaging, permanent magnet technology, applied in the direction of magnetic objects, preventing/reducing unwanted electric/magnetic influence, application, etc., to achieve the effect of changing structure, improving corrosion resistance, and reducing the weight of the whole machine

Active Publication Date: 2014-06-18
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects or deficiencies in the prior art in improving the magnetic field strength of the permanent magnet, reducing noise, improving imaging quality and reducing the overall quality, the present invention provides a permanent magnet for nuclear magnetic resonance imager

Method used

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Embodiment 1

[0026] Embodiment 1: H-type open permanent magnet

[0027] Main magnetic field strength: 5000±50Gs (when the constant temperature of the magnet is 32°C);

[0028] Magnetic material: NdFeB;

[0029] Remanence Br: 14.9KGs;

[0030] Coercivity bHc: ≥ 10.5KOe;

[0031] Maximum magnetic energy product (BH) max: 53MGOe;

[0032] Magnetic steel height: 220mm;

[0033] Magnetic field direction: vertical, the upper pole surface is S;

[0034] Magnet gap: 510mm from pole face to pole face;

[0035] Plate width: 1400mm;

[0036] Uniformity: Φ500mm×380mm ball, uniformity: 100ppm;

[0037] Φ400mm×350mm ball, uniformity: 20ppm;

[0038] Eddy current situation: The magnet has anti-eddy current treatment (X, Y direction <0.4%, Z direction <1.0% 100Gs / m)

[0039] Magnet dimensions: Width: 1.5 m; Height: 1.9m; ​​Length: 2.8m.

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Abstract

The invention discloses a permanent magnet used for a nuclear magnetic resonance imager. The permanent magnet comprises upper and lower housing caps and double-columns, wherein the upper and lower housing caps and the double-columns are connected through bolts to form a building block-type assembled H-shaped yoke; two steel magnets, two polar plates, two shimming rings, two eddy current discs, gradient coils and transmitting coils are respectively and symmetrically arranged on the upper and lower housing caps in sequence to form testing regions; the upper outer end part of each polar plate is provided with the corresponding shimming ring; the two eddy current discs are respectively arranged in the two shimming rings; the two gradient coils and the two transmitting coils are respectively arranged on the two eddy current discs in the shimming rings; the magnetic field intensity of each imaging region (i.e. sphere region, of which the diameter is 400nm, at the central region of the permanent magnet) is between 4000 gauss to 5500 gauss. The eddy current discs respectively manufactured by splicing amorphous sheets of an iron-based amorphous alloy soft magnetic strip 1K101 is capable of better eliminating or reducing eddy current generated by the polar plates, and therefore, the signal to noise ratio is higher, and imaging is clearer; by adopting the N52-N55 high-performance neodymium-iron-boron steel magnets and the gradient and transmitting integrated coils, the overall dimension reduction and the total weight reduction of the permanent magnet can be realized, and moreover, processing is simple, the structure is changeable and shimming is convenient.

Description

technical field [0001] The invention belongs to the field of nuclear magnetic resonance, in particular to a permanent magnet for a nuclear magnetic resonance imager. Background technique [0002] NdFeB rare earth permanent magnet materials have been used more and more for their excellent magnetic properties, and are widely used in the field of medical nuclear magnetic resonance imaging instruments. Magnetic resonance imagers are not only widely used in the medical field, but also have a wide range of potential applications in food science and mine prospecting. [0003] As an important product in the medical device industry, medical diagnostic imaging equipment is one of the essential equipment for hospitals at all levels. Among them, the nuclear magnetic resonance imager provides the largest amount of information, has no ionizing radiation, and has no adverse effects on the human body. Compared with X-ray and CT, magnetic resonance imaging has the advantages of high resolu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/383H01F7/02H01F27/34H01F1/057
Inventor 陈晓东白琼杨永泽
Owner SHENYANG GENERAL MAGNETIC
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