Abstract #2213

On Peripheral Nerve Stimulation of a Compact, Asymmetric Head-Only Gradient Coil: Head Orientation Dependence

Seung-Kyun Lee¹, Kishore V. Mogatadakala², Dominic Graziani¹, Jean-Baptiste Mathieu², Thomas K.-F. Foo¹, and Matt A. Bernstein³

¹GE Global Research, Niskayuna, NY, United States, ²GE Healthcare, Florence, SC, United States, ³Mayo Clinic, Rochester, MN, United States

Head orientation dependence of the peripheral nerve stimulation (PNS) thresholds and the induced electric fields of a high-performance, asymmetric head-only gradient coil were studied experimentally and by numerical simulation. In the experiment, the gradient field direction was fixed and the subject head was rotated in the transverse plane. The subject-reported PNS thresholds nearly doubled when the head's anterior-posterior direction was parallel to the gradient compared to when the head was approximately perpendicular to the gradient. Human-body-model simulation suggested that the orientation dependence may be primarily due to locally concentrated electric fields in the corrugated regions of the face.

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