PMID: 11900191Mar 20, 2002Paper

Electric fields induced in a spherical volume conductor by temporally varying magnetic field gradients

Physics in Medicine and Biology
Martin BencsikRoger Bowley

Abstract

A homogeneous spherical volume conductor is used as a model system for the purpose of calculating electric fields induced in the human head by externally applied time-varying magnetic fields. We present results for the case where magnetic field gradient coils, used in magnetic resonance imaging (MRI), form the magnetic field, and we use these data to put limits on the rates of gradient change with time needed to produce nerve stimulation. The electric field is calculated analytically for the case of ideal longitudinal and transverse linear field gradients. We also show results from computer calculations yielding the electric field maps in a sphere when the field gradients are generated by a real MRI gradient coil set. In addition, the effect of shifting the sphere within each gradient coil volume is investigated. Numerical analysis shows similar results when applied to a model human head.

References

Dec 1, 1990·Annals of Neurology·D CohenD L Schomer
May 1, 1990·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·M S CohenH L Kantor
Jan 1, 1993·Magnetic Resonance Imaging·R Turner
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Nov 7, 2000·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·R Bowtell, R M Bowley

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Citations

Oct 1, 2009·IEEE Transactions on Biomedical Circuits and Systems·E Basham Wentai Liu
Apr 23, 2009·NeuroImage·Winston X YanRichard Bowtell
Jan 13, 2017·Medical Physics·Xin Chen, Michael Steckner
Jul 24, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Martin BencsikRoger M Bowley
May 9, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Weihua MaoChristopher M Collins
Oct 15, 2009·Physics in Medicine and Biology·P M Glover
Aug 3, 2004·Physics in Medicine and Biology·Peter T While, Larry K Forbes
Jun 4, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Peter B RoemerBrian K Rutt

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