Design method of permanent magnet longitudinal gradient coil based on 0-1 integer programming

A gradient coil and integer programming technology, applied in the measurement of magnetic variables, measurement devices, instruments, etc., can solve problems such as difficult to obtain the global optimal solution of coil performance parameters, difficult to impose constraints, etc., to achieve convenient constraints and simple calculations. Direct, small coil inductance effect

Active Publication Date: 2021-06-11
CHINA JILIANG UNIV
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Problems solved by technology

[0008] In view of this, the purpose of the present invention is to provide a permanent magnet type longitudinal gradient coil design method based on 0-1 integer programming that is convenient for finding the global optimal solution of the coil performance parameters, so as to solve the problem of not being easy to apply in the prior art. Constraint conditions, technical problems that are difficult to obtain the global optimal solution of coil performance parameters

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  • Design method of permanent magnet longitudinal gradient coil based on 0-1 integer programming
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  • Design method of permanent magnet longitudinal gradient coil based on 0-1 integer programming

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[0048] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0049] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0050] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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Abstract

The invention discloses a permanent magnet type longitudinal gradient coil design method based on 0-1 integer programming. The invention proposes a 0-1 integer programming method for longitudinal gradient coil design aiming at the problems existing in the separate winding method. In this method, the area where the coil is located is divided into several one-dimensional grids, and the center of the grid is taken as the radius of the current circle to be calculated. Given the current I of the ring coil, if the current ring somewhere contributes to the magnetic field, the variable is 1, the current is 1*I, and if there is no contribution, the variable is 0, and the current is 0. The calculation of this method is simple and direct, and the minimum inductance of the coil or the minimum material can be used as the goal. It is easy to achieve a good linearity of the gradient magnetic field, and it is convenient to impose constraints on the spacing of the coils.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a design method of a permanent magnet type longitudinal gradient coil based on 0-1 integer programming. Background technique [0002] Magnetic resonance imaging is an imaging technique based on the phenomenon of nuclear magnetic resonance. Gradient coils are an important part of the magnetic resonance imaging system. They are used to generate linearly changing magnetic fields along three orthogonal directions in the imaging area, which are respectively applied to slice selection, phase encoding and frequency encoding, so as to provide positioning basis for image reconstruction. . The structure of the gradient coil mainly includes a closed cylindrical structure and an open planar structure. [0003] At present, most permanent magnetic resonance imaging systems adopt an open planar disk structure, and superconducting magnetic resonance imaging systems mostly ad...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/385
CPCG01R33/385
Inventor 李霞郑思杰刘晓芳徐文龙
Owner CHINA JILIANG UNIV
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