Open-type nuclear magnetic resonance magnet system with iron hoop structure
A nuclear magnetic resonance, open technology, applied in the direction of magnetic objects, superconducting magnets/coils, measuring magnetic variables, etc., can solve the problems of large volume and complex structure of the external support structure
Active Publication Date: 2013-03-13
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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[0005] In order to overcome the shortcomings of large volume and complicated structure of the external support structure of the current nuclear magnetic resonance magnet, the present invention proposes an open nuclear magnetic resonance magnet system with an iron ring structure. The present invention can self-balance the strong force between the superconducting coil and the iron yoke. The mutual electromagnetic force will offset the electromagnetic force to close to zero
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[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0016] Such as figure 1 As shown, the open NMR magnet system of the present invention includes a circular superconducting coil 1 and a cryogenic container 2. The magnet system is divided into upper and lower parts, which have the same structure and are symmetrical about the center. The superconducting coil 1 is placed inside the cryogenic container 2 to obtain a low temperature environment, and the upper and lower parts of the cryogenic container 2 are connected by a connecting pipe 12 of the cryogenic container. The superconducting coil 1 and the superconducting switch 14 form a closed-loop current circuit to generate a magnetic field, and the generated magnetic field obtains a magnetic flux circuit through the upper and lower iron yokes 3 and the side iron yokes 13, and performs magnetic field shielding. The upper and lower iron yokes 3 and ...
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Abstract
An open nuclear magnetic resonance magnet system having an iron ring structure. A superconducting coil (1) and a superconducting switch (14) form a closed current loop to generate a magnetic field, and the generated magnetic field obtains a magnetic flux loop and executes magnetic field shielding via upper and lower iron yokes (3) and lateral iron yokes (13). The magnet system generates the required magnetic field in a magnet imaging central area (15) via the superconducting coil (1). In order to balance the great electromagnetic force between the superconducting coil (1) and the upper and lower iron yokes (3), an annular iron ring (4) is installed in the inner aperture of a low temperature container (2). The magnetic field distribution between the superconducting coil (1) and the upper and lower iron yokes (3) is changed via the iron ring (4), thereby reducing the interactive electromagnetic force therebetween.
Description
technical field [0001] The invention relates to a magnet system for a nuclear magnetic resonance imaging device. Background technique [0002] Medical MRI systems require a strong central magnetic field and a relatively spacious imaging space. A stronger central magnetic field can improve the imaging resolution. Compared with the cylindrical structure, the open magnet system formed by the separated superconducting coil provides the patient with a magnetic field perpendicular to the sample space, so its imaging efficiency is parallel to the magnetic field times, indicating that the vertical field has a higher imaging efficiency than the parallel field. The time-varying gradient magnetic field is superimposed on the main magnetic field to form a spatial encoding of the imaging space, and the sample is excited by the radio frequency coil, thereby providing patients with clear diagnostic images. At the same time, the separated superconducting coil magnet system can provide a...
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IPC IPC(8): H01F6/00G01R33/3815
CPCG01R33/3815G01R33/3875G01R33/3806G01R33/421G01R33/34023
Inventor 王秋良王晖胡新宁戴银明严陆光许建益
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI