COIL OPTIMIZATION FOR MRI BY CONJUGATE-GRADIENT DESCENT

被引：83

作者：

WONG, EC

JESMANOWICZ, A

HYDE, JS

机构：

[1] Biophysics Section, Department of Radiology, Medical College of Wisconsin, Milwaukee, Wisconsin

来源：

MAGNETIC RESONANCE IN MEDICINE | 1991年 / 21卷 / 01期

关键词：

D O I：

10.1002/mrm.1910210107

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

A flexible iterative algorithm is presented for optimizing gradient and radio frequency coils for MRI. It is based on a model using discrete current elements and direct Biot‐Savart calculation of the fields. An error function is defined over a region of interest (ROI) and is minimized by conjugate gradient descent. The choice of error function allows optimization of the field uniformity, the inductance, and the efficiency of the coil in any combination. Neither the coil nor the ROI is restricted to any particular geometry. A 40‐ turn cylindrical z‐gradient coil of radius a and length 4a, designed for a ROI of radius 0.7a and length 2a has an average error in the gradient fields generated of 0.85%, an inductance of 0.014a mH/cm, and an efficiency of 6.65a−2 Gem/A. A 16‐turn birdcage‐like RF coil of radius 5 cm, designed for a ROI of radius 4 cm has an average error of 0.79%. © 1991 Academic Press, Inc. Copyright © 1991 Wiley‐Liss, Inc., A Wiley Company

引用

页码：39 / 48

页数：10

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