M Bencsik et al 2002 Phys. Med. Biol. 47 557 doi:10.1088/0031-9155/47/4/302
Electric fields induced in a spherical volume conductor by temporally varying magnetic field gradients
M Bencsik, R Bowtell and R M Bowley
Show affiliationsA 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.
- PACS
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87.61.Tg Clinical applications
02.70.Dh Finite-element and Galerkin methods
87.50.C- Static and low-frequency electric and magnetic fields effects
- Subjects
- Dates
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Issue 4 (21 February 2002)
Received 12 October 2001
Published 1 February 2002
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Electric fields induced in a spherical volume conductor by temporally varying magnetic field gradients
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