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Abstract #3552

Peripheral Nerve Stimulation Thresholds of a High Performance Insertable Head Gradient Coil

Trevor P Wade1,2, Andrew Alejski1, Charles A McKenzie2, and Brian K Rutt3

1Robarts Research Institute, Western University, London, ON, Canada, 2Medical Biophysics, Western University, London, ON, Canada, 3Dept. of Radiology, Stanford University, Stanford, CA, United States

A high performance insertable head gradient was evaluated for peripheral nerve stimulation and found to have PNS thresholds several times higher than body gradients and equal to or exceeding existing head gradients. The most sensitive axis (Y) had a threshold of ΔGmin = 108 ± 4 mT/m and SRmin = 156 ± 9 T/m/s. This rapidly insertable coil has the hardware capability to reach ∆Gmax of 120mT/m single axis and 400mT/m triple axis with presently available clinical gradient amplifiers, meaning extremely high hardware performance but also that PNS thresholds are reached on most axes.

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