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High-field-intensity focusing nuclear magnetic resonance magnetic field and preparation method thereof

A nuclear magnetic resonance and strong focusing technology, which is applied in the directions of magnetic resonance measurement, magnetic variable measurement, and measuring devices, can solve the problems of low magnetic field intensity, poor uniformity and stability of the magnetic field, and the specific structure is not explained, and achieve a uniform magnetic field. Effect

Inactive Publication Date: 2010-09-08
MIANYANG WESTMAG MAGNETISM & ELECTRICITY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of many published MRI magnet patents, there are the following problems: high manufacturing cost, low magnetic field strength (≤0.35T), poor uniformity and stability of magnetic field
There are few reports on the patents of magnetic concentration technology. Only the utility model patent "A Thermomagnetic Alloy Compensation Magnetic Resonance Imaging Magnet" with the patent number CN2534973 mentions a magnetic resonance imaging ring, but the specific structure is not specified in this patent. illustrate

Method used

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  • High-field-intensity focusing nuclear magnetic resonance magnetic field and preparation method thereof
  • High-field-intensity focusing nuclear magnetic resonance magnetic field and preparation method thereof
  • High-field-intensity focusing nuclear magnetic resonance magnetic field and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0037] Magnetic field strength in working area: B 0 =0.5T

[0038] Main magnetic block and magnetic ring magnet material: N45 sintered neodymium iron boron magnet

[0039] The performance requirements of the main magnetic block and the concentrating ring magnet: Remanence Br 13.2~13.5KGs

[0040] Magnetic induction coercivity Hcb 11.5~12.5KOe

[0041] Intrinsic coercivity Hcj 12.5~13.5KOe

[0042] Maximum magnetic energy product (BH) max 43~45MGO

[0043] Working air gap: height 490mm

[0044] Width 1100mm

[0045] Magnetic pole size: vertical width 1100mm

[0046] Horizontal length 1100mm

[0047] Main magnet height 270mm

[0048] Concentrator ring unit magnet size: angle 6°

[0049] Wall thickness 40mm

[0050] Vertical height 40mm

[0051] Uniformity of magnetic field: 8ppm in Φ300mm sphere, 3ppm in Φ200 sphere

[0052] Magnetic field sta...

example 2

[0055] Magnetic field strength in working area: B 0 =0.55T

[0056] Main magnet block and magnetic ring magnet material: N45 sintered neodymium iron boron magnet

[0057] The performance requirements of the main magnetic block and the concentrating ring magnet: Remanence Br 13.2~13.5KGs

[0058] Magnetic induction coercivity Hcb 11.5~12.5KOe

[0059] Intrinsic coercivity Hcj 12.5~13.5KOe

[0060] Maximum magnetic energy product (BH) max 43~45MGO

[0061] Working air gap: height 490mm

[0062] Width 1100mm

[0063] Magnetic pole size: vertical width 1100mm

[0064] Horizontal width 1100mm

[0065] Main magnet height 300mm

[0066] Concentrator ring unit magnet size: angle 6°

[0067] Wall thickness 40mm

[0068] Vertical height 40mm

[0069] Uniformity of magnetic field: 8ppm in Φ300mm sphere, 3ppm in Φ200 sphere

[0070] Magnetic field stability: The temperature...

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Abstract

The invention relates to a nuclear magnetic resonance magnetic field and a preparation method thereof, which belong to the field of rare earth permanent magnetic materials and nuclear magnetic resonance imaging. The invention particularly relates to a high-field-intensity focusing nuclear magnetic resonance magnetic field and a preparation method thereof. The high-field-intensity focusing nuclear magnetic resonance magnetic field adopts a dual-column C-shaped open structure; a C-shaped machine frame adopts 45# steel with high mechanical strength and magnetic conductivity and a composite polar plate, and is designed with a magnetic gathering ring; and simultaneously the distance between the polar plate and a vertical supporting yoke is increased, and a passive artificial shimming and an active computer-assisted shimming are adopted. The preparation method can prepare a high-field-intensity focusing magnet, has an easily controlled technological process and is suitable for batch production.

Description

Technical field [0001] The invention relates to nuclear magnetic resonance and a preparation method thereof, and belongs to the field of rare earth permanent magnet materials and nuclear magnetic resonance imaging, in particular to a high-field-strength focused nuclear magnetic resonance magnetic field and a preparation method. Background technique [0002] Magnetic resonance imaging (MRI, magnetic resonance imaging) system is a new type of medical diagnostic equipment developed in the late 1970s, which is widely used in the fields of biology, medical basic research and clinical medical diagnosis. The magnetic field is the main part of the nuclear magnetic resonance imaging system. The source of the magnetic field has experienced three stages: conventional electromagnet magnetic field, superconducting magnetic field and the permanent magnetic (mainly sintered neodymium iron boron permanent magnet) magnetic field that is currently being vigorously developed. It has also developed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/38G01R33/383
Inventor 赵导文邓盛贤刘波张超
Owner MIANYANG WESTMAG MAGNETISM & ELECTRICITY CO LTD
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