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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