PARAMETER RELATIONS FOR THE SHINNAR-LEROUX SELECTIVE EXCITATION PULSE DESIGN ALGORITHM

被引：650

作者：

PAULY, J ^{[1
]}

LEROUX, P ^{[1
]}

NISHIMURA, D ^{[1
]}

MACOVSKI, A ^{[1
]}

机构：

[1] GE,MED SYST GRP,MILWAUKEE,WI 53188

来源：

IEEE TRANSACTIONS ON MEDICAL IMAGING | 1991年 / 10卷 / 01期

基金：

美国国家卫生研究院; 美国国家科学基金会;

关键词：

D O I：

10.1109/42.75611

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

Selective excitation pulses are used in magnetic resonance imaging (MRI) to isolate a specific slice through the subject. The pulse design problem is in general nonlinear due to the nonlinearity of the Bloch equation. Recently a direct solution has been proposed by Shinnar and his co-workers [1]-[6], and Le Roux [7]-[9]. In this paper we first present an overview of the Shinnar-Le Roux (SLR) algorithm. We then show how the performance of SLR pulses can be very accurately specified analytically. This is useful because it tells how to design a pulse that produces a specified slice profile. More importantly, it allows the pulse designer to trade-off analytically the parameters describing the pulse performance. We present several examples to illustrate the more important trade-offs. These include linear-phase and minimum- and maximum-phase pulses. Linear-phase pulses can be refocused with a gradient reversal, and can be used as spin-echo pulses. Minimum- and maximum-phase pulses have better slice profiles, but cannot be completely refocused.

引用

页码：53 / 65

页数：13

共 22 条

[1] OPTIMAL-CONTROL SOLUTIONS TO THE MAGNETIC-RESONANCE SELECTIVE EXCITATION PROBLEM [J].