Does trans-membrane stimulation occur in peripheral nerve stimulation: why the SENN does not fit the data?
Donald McRobbie1,2
1South Australian Medical Imaging, Flinders Medical Centre, Adelaide, Australia, 2Surgery, Imperial College, London, United Kingdom
The Spatial Extended Non-linear Node (SENN) model currently used in MR safety guidelines does not adequately predict the behaviour of magnetic stimulation in terms of its time constant and waveform dependence. This has implications for the setting of gradient limits in MRI. Stimulation of the nerve by induced electric fields perpendicular to the nerve axis may remove the inconsistencies. A better model of magnetic stimulation is required.
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