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Abstract #0114

No substantial peripheral nerve stimulation beyond 5000T/m/s when driving a head gradient coil at 20kHz

Jolanda M Spijkerman1, Edwin Versteeg2, Dennis WJ Klomp2, David G Norris1,3, and Jeroen CW Siero2,4
1Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen, Nijmegen, Netherlands, 2Department of Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 3Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany, 4Spinoza Center for Neuroimaging Amsterdam, Amsterdam, Netherlands

In this work the PNS threshold of a recently introduced gradient head coil operating at 20kHz was determined in four healthy subjects. The gradient slew rate was increased to 5000T/m/s by varying the amplitude between 7.5–40mT/m, the maximal gradient strength currently available. One subject reported no PNS, two subjects reported mild PNS at the highest gradient amplitudes of 36.25, 37.5 and 40mT/m, and one subject reported mild sensations during 31.25mT/m, but was uncertain whether this was PNS. In conclusion, application of the coil at 20kHz is currently restricted by the available gradient strength, rather than PNS.

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