| 有源屏蔽的超导核磁共振成象磁体的设计 |
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| 引用本文： | 励庆孚,江有名,李新蛇.有源屏蔽的超导核磁共振成象磁体的设计[J].电工技术学报,1992(1). |
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| 作者姓名： | 励庆孚 江有名 李新蛇 |
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| 作者单位： | 西安交通大学，西安交通大学，西安交通大学 |
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| 摘 要： | 本文提出了一种具有有源屏蔽的核磁共振成象(MRI)超导磁体的设计方法。主线圈和屏蔽线圈几何参数的配合应使磁场中的所有12次以下谐波完全消除,以满足MRI装置对磁场均匀度的要求。屏蔽线圈和主线圈的磁矩正好相互抵消,使离磁体较远处的杂散磁场基本消除,以满足对杂散磁场进行屏蔽的要求。屏蔽线圈径向和轴向尺寸的确定综合考虑了屏蔽效果、超导线用量、屏蔽线圈和主线圈间电磁作用力以及低温容器结构尺寸的影响。文章给出了一个设计实例。
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| 关 键 词： | 超导磁体 核磁共振成象磁体 |
A Coil Design Method of Actively Shielded Superconducting MRI Magnet |
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| Li Qingfu Jiang Youming Li Xinshe.A Coil Design Method of Actively Shielded Superconducting MRI Magnet[J].Transactions of China Electrotechnical Society,1992(1). |
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| Authors: | Li Qingfu Jiang Youming Li Xinshe |
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| Affiliation: | Xi'an Jiaotong University |
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| Abstract: | A coil design Method of the actively shielded superconducting MRI magnet is presented in this paner. In order to realize a highly homogeneous magnetic field over the imaging space,the first ten higher order legendre multipoles are theoretically eliminated by appropriate geometrically matching of the main coil and bucking coil.In order to reduce the stray field significantly,the net magnetic dipole monent produced by main coil and bucking coil must be adjusted to be zero.In order to determine the radial and axial dimensions of the bucking coil,their effects on shielding efficiency, conductor volume,electromagnetic forces between main coil and bucking coil as well as dimensions of the cryogenic vessel are discussed. |
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| Keywords: | Superconducting magnets Nuclear magnetic resonance imaging magnets |
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