PHYSIOLOGICAL-EFFECTS OF FAST OSCILLATING MAGNETIC-FIELD GRADIENTS

被引:100
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
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
收藏
页码:909 / 914
页数:6
相关论文
共 28 条
  • [1] BARKER AT, 1985, LANCET, V1, P1106
  • [2] TRANSCHEST MAGNETIC (EDDY-CURRENT) STIMULATION OF THE DOG HEART
    BOURLAND, JD
    MOUCHAWAR, GA
    NYENHUIS, JA
    GEDDES, LA
    FOSTER, KS
    JONES, JT
    GRABER, GP
    [J]. MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 1990, 28 (02) : 196 - 198
  • [3] BOURLAND JD, 1990, UNPUB 9TH ANN M SOC, P1157
  • [4] BUDINGER TF, 1990, 9TH ANN M SOC MAGN R, P276
  • [5] COHEN LG, 1988, J CLIN NEUROPHYSIOL, V5, P371
  • [6] SENSORY STIMULATION BY TIME-VARYING MAGNETIC-FIELDS
    COHEN, MS
    WEISSKOFF, RM
    RZEDZIAN, RR
    KANTOR, HL
    [J]. MAGNETIC RESONANCE IN MEDICINE, 1990, 14 (02) : 409 - 414
  • [7] STRENGTH-DURATION CURVES IN CARDIAC PURKINJE FIBERS - EFFECTS OF LIMINAL LENGTH AND CHARGE-DISTRIBUTION
    FOZZARD, HA
    SCHOENBERG, M
    [J]. JOURNAL OF PHYSIOLOGY-LONDON, 1972, 226 (03): : 593 - +
  • [8] TISSUE STIMULATION - THEORETICAL CONSIDERATIONS AND PRACTICAL APPLICATIONS
    GEDDES, LA
    BOURLAND, JD
    [J]. MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 1985, 23 (02) : 131 - 137
  • [9] SPATIAL LOCALIZATION IN 2 DIMENSIONS USING NMR DESIGNER PULSES
    HARDY, CJ
    CLINE, HE
    [J]. JOURNAL OF MAGNETIC RESONANCE, 1989, 82 (03): : 647 - 654
  • [10] ELECTRICAL INDUCTION OF VENTRICULAR-FIBRILLATION IN HUMAN HEART - STUDY OF EXCITABILITY LEVELS WITH ALTERNATING-CURRENT OF DIFFERENT FREQUENCIES
    KUGELBERG, J
    [J]. SCANDINAVIAN JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY, 1976, 10 (03): : 237 - 240