PHYSIOLOGICAL-EFFECTS OF FAST OSCILLATING MAGNETIC-FIELD GRADIENTS

被引：101

作者：

BUDINGER, TF ^{[1
]}

FISCHER, H ^{[1
]}

HENTSCHEL, D ^{[1
]}

REINFELDER, HE ^{[1
]}

SCHMITT, F ^{[1
]}

机构：

[1] SIEMENS AG,MED ENGN GRP,W-8520 ERLANGEN,GERMANY

来源：

JOURNAL OF COMPUTER ASSISTED TOMOGRAPHY | 1991年 / 15卷 / 06期

关键词：

MAGNETIC RESONANCE IMAGING; TECHNIQUES; APPARATUS AND EQUIPMENT; ECHO PLANAR IMAGING; PHYSICS AND INSTRUMENTATION;

D O I：

10.1097/00004728-199111000-00001

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：

To evaluate the physiological thresholds of neuromuscular stimulation relevant to very fast NMR imaging studies that use gradient switching at frequencies of 1-2 kHz and a maximum magnetic field of up to 10 mT, a series of studies were done with human volunteers using an experimental echo planar gradient coil set. The threshold for induction of localized and momentary sensations in the human back and abdomen for 10 subjects is 60 T/s for sinusoidally oscillating magnetic fields at 1.27 kHz. The threshold relates to an E field of 6 V/m and is shown to vary with number of oscillations and frequency in accord with theory. Using a simple model of E field induction, the threshold for stimulation of cardiac electrical events should be > 4 times this value.

引用

页码：909 / 914

页数：6

共 28 条

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