传输线分析在鸟笼谐振器多重调谐中的应用。

Use of transmission line analysis for multi-tuning of birdcage resonators.

作者信息

Pascone R, Vullo T, Farrelly J, Mancuso R, Cahill P T

机构信息

Department of Electrical Engineering, Manhattan College, Riverdale, NY 10471.

出版信息

Magn Reson Imaging. 1993;11(5):705-15. doi: 10.1016/0730-725x(93)90013-4.

DOI:10.1016/0730-725x(93)90013-4

PMID:8345785

Abstract

A general analysis for double- and higher order tuning of birdcage resonators is presented based on a lumped element transmission line model. Expressions were developed for the determination of the resonant frequencies of bandstop and bandpass birdcage coils and, with specific restrictions, for capacitor values required to obtain any two desired mode one resonant frequencies. Experimental measurements on three variants each of an eight-column bandstop and an eight-column bandpass were in excellent agreement with theory; the average absolute frequency difference and percent deviation were 1.51 +/- 1.57 MHz and 2.61 +/- 2.36%, respectively. In addition, 31P and 1H phantom images were obtained at 2.0 T using a representative bandstop coil.

摘要

基于集总元件传输线模型，对鸟笼式谐振器的二阶及更高阶调谐进行了一般性分析。推导了用于确定带阻和带通鸟笼式线圈谐振频率的表达式，并在特定限制条件下，推导出了获得任意两个所需模式一谐振频率所需的电容值表达式。对八柱带阻和八柱带通的三种变体进行的实验测量与理论结果高度吻合；平均绝对频率差和百分比偏差分别为1.51±1.57 MHz和2.61±2.36%。此外，使用一个代表性的带阻线圈在2.0 T磁场下获得了31P和1H的体模图像。