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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