A permanent magnet for nuclear magnetic resonance imager
A technology of nuclear magnetic resonance imaging and permanent magnets, which is applied to magnetic objects, prevents/reduces unwanted electrical/magnetic effects, and applications, and achieves the effects of reducing production costs, changing structures, and facilitating shimming of the structure.
Active Publication Date: 2016-05-25
SHENYANG GENERAL MAGNETIC
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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
[0024] Embodiment 1: C-type open permanent magnet
[0025] Main magnetic field strength: 3500±15Gs (when the constant temperature of the magnet is 32°C);
[0026] Magnetic material: NdFeB;
[0027] Remanence Br: 14.9KGs;
[0028] Coercivity bHc: ≥ 10.5KOe;
[0029] Maximum magnetic energy product (BH) max: 53MGOe;
[0030] Magnet height: 150mm;
[0031] Magnetic field direction: vertical, the upper pole surface is S;
[0032] Magnet gap: 510mm from pole face to pole face;
[0033] Plate diameter: 1200mm;
[0034] Uniformity: Φ500mm×380mm ball, uniformity: 100ppm; Φ400mm×350mm ball, uniformity: 20ppm;
[0035] Eddy current situation: The magnet has anti-eddy current treatment (X, Y direction <0.4%, Z direction <1.0%100Gs / m)
[0036] Magnet external dimensions: width 1.2m; height 1.7m; length 2.1m.
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Abstract
The invention discloses a permanent magnet used for a nuclear magnetic resonance imager. The permanent magnet comprises a vertical machine frame cover and a stand column, and the vertical machine frame cover and the stand column are connected through bolts to form a cordwood type assembling yoke. The vertical machine frame cover is sequentially and symmetrically provided with magnetic steel pieces, pole plates, shimming rings, vortex discs, gradient coils and emitting coils to form a test region. The shimming rings are arranged at the upper outer ends of the pole plates, and the vortex discs, the gradient coils and the emitting coils are arranged in the shimming rings. The magnetic field intensity of a permanent magnet imaging region (namely, a spherical region with the diameter of 400 mm in the center of the permanent magnet) ranges from 2000 Gs to 4000 Gs. The vortex discs made of ferrum-based amorphous alloy soft magnetic strips 1K101 can better eliminate or reduce vortexes generated by the pole plates, the signal-to-noise ratio is better, and images are clearer. Due to the adoption of the gradient coils and emitting coils made of N52-N55 high-performance neodymium-iron-boron, the overall size of the permanent magnet and the weight of a whole machine can be reduced. The permanent magnet is easy to machine, diverse in structure and suitable for shimming.
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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IPC IPC(8): A61B5/055G01R33/383H01F7/02H01F27/34H01F1/057
Inventor 陈晓东白琼杨永泽
Owner SHENYANG GENERAL MAGNETIC