Spherical harmonic inductive detection coils for dynamic pre-emphasis

被引：7

作者：

Edler, Karl ^{[1
]}

Hoult, David ^{[1
]}

机构：

[1] Natl Res Council Canada, Inst Biodiagnost, Winnipeg, MB R3B 1Y6, Canada

来源：

MAGNETIC RESONANCE IN MEDICINE | 2008年 / 60卷 / 02期

关键词：

eddy currents; pre-emphasis; shim coil; gradient coil; harmonic detection coil;

D O I：

10.1002/mrm.21693

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：

The issue of eddy currents induced by the rapid switching of magnetic field gradients is a long-standing problem. A new method for dealing with this problem is presented whereby spatial harmonic components of the magnetic field are continuously sensed, through their temporal rates of change, and corrected. In this way, the effects of the eddy currents on the magnetic field can be detected and correction currents applied to the appropriate gradient or shim coils in a time much less than the rise time of the gradients. This new methodology has the potential to dynamically shape eddy current corrections for multiple spatial harmonic components of the field.

引用

页码：277 / 287

页数：11