Rapid polarizing field cycling in magnetic resonance imaging

被引：47

作者：

Matter, NI ^{[1
]}

Scott, GC

Grafendorfer, T

Macovski, A

Conolly, SM

机构：

[1] Stanford Univ, Dept Elect Engn, Magnet Resonance Syst Res Lab, Stanford, CA 94305 USA

[2] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA

来源：

IEEE TRANSACTIONS ON MEDICAL IMAGING | 2006年 / 25卷 / 01期

关键词：

electromagnet power supplies; magnetic fields; magnetic resonance imaging; power electronics;

D O I：

10.1109/TMI.2005.861014

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

We describe the electronics for controlling the independently pulsed polarizing coil in a prepolarized magnetic resonance imaging (PMRI) system and demonstrate performance with free induction decay measurements and in vivo imaging experiments. A PMRI scanner retains all the benefits of acquiring MRI data at low field, but with the higher signal of the polarizing field. Rapidly and efficiently ramping the polarizing coil without disturbing the data acquisition is one of the major challenges of PMRI. With our modular hardware design, we successfully ramp the 0.4-T polarizing coil of a wrist-sized PMRI scanner at up to 100 T/s without causing image artifacts or otherwise degrading data acquisition.

引用

页码：84 / 93

页数：10