Optimal Design for Open MRI Superconducting Magnet with Active Shielding

作     者：王春忠 王秋良 李兰凯 荣明 周又元 

作者机构：Institute of Electrical EngineeringChinese Academy of Sciences Academy of Armored Forces Engineering Yichang Testing Technique Research Institute 

基　　金：supported by the National Natural Science Foundation of China(No.50577063) 

出 版 物：《Journal of Measurement Science and Instrumentation》 (测试科学与仪器（英文版）)

年 卷 期：2010年第1卷第2期

页      码：178-182页

摘      要：The optimal design method for an open Magnetic Resonance Imaging （MRI） superconducting magnet with an active shielding configuration is proposed. Firstly, three pairs of current rings are employed as seed coils. By optimizing the homogeneity of Diameter Sphere Voltnne （DSV）, the positions and currents of the seed coils will be obtained. Secondly, according to the positions and currents of the seed coils, the current density of superconducting wires is determined, and then the original sections for the coils can be achieved. An optimization for the homogeneity based on the constrained nonlincar optimization method is employed to determine the coils with good homogeneity. Thirdly, the magnetic field generated by previous coils is set as the background field, then add two coils with reverse current, and optimize the stray field line of 5 Gauss in a certain scope. Finally, a further optimization for the homogeneity is used to get Final coils. This method can also be used in the design of other axisynmaetfic superconducting MRI magnets.

主 题 词：MRI superconducting magnet nonlinear least square optimization 

学科分类：07[理学] 0809[工学-计算机类] 070205[070205] 08[工学] 0805[工学-能源动力学] 080502[080502] 0702[理学-物理学类] 

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