圆柱形鞍形线圈的有源屏蔽：应用于极低场核磁共振成像和磁共振成像的绕线式射频线圈。

Active shielding of cylindrical saddle-shaped coils: application to wire-wound RF coils for very low field NMR and MRI.

作者信息

Bidinosti C P, Kravchuk I S, Hayden M E

机构信息

Department of Physics, Simon Fraser University, Burnaby, BC, Canada.

出版信息

J Magn Reson. 2005 Nov;177(1):31-43. doi: 10.1016/j.jmr.2005.07.003.

DOI:10.1016/j.jmr.2005.07.003

PMID:16099186

Abstract

We provide an exact expression for the magnetic field produced by cylindrical saddle-shaped coils and their ideal shield currents in the low-frequency limit. The stream function associated with the shield surface current is also determined. The results of the analysis are useful for the design of actively shielded radio-frequency (RF) coils. Examples pertinent to very low field nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) are presented and discussed.

摘要

我们给出了圆柱鞍形线圈及其理想屏蔽电流在低频极限下产生的磁场的精确表达式。还确定了与屏蔽表面电流相关的流函数。分析结果对有源屏蔽射频（RF）线圈的设计很有用。给出并讨论了与极低场核磁共振（NMR）和磁共振成像（MRI）相关的示例。