Abstract #0112

Mitigating Peripheral Nerve Stimulations for MRI Gradient Coils using Surface Electrodes

Mathias Davids^1,2,3, Bastien Guerin^1,2, and Lawrence L Wald^1,2,4

¹A.A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Dept. of Radiology, Charlestown, MA, United States, ²Harvard Medical School, Boston, MA, United States, ³Computer Assisted Clinical Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany, ⁴Harvard-MIT Health Sciences and Technology, Cambridge, MA, United States

Peripheral Nerve Stimulation is becoming an important limitation for state-of-the-art head gradients, which despite higher PNS thresholds, are also operated at higher slew-rate and have limited degrees-of-freedom for FOV design mitigation strategies. We introduce a new mitigation approach, which uses contact surface electrodes driven simultaneously with the gradient coils to cancel the E-field induced by switching of the coil, thus increasing its PNS thresholds. We simulated the capability of four sets of electrodes placed in different areas of the face and found an up to 56% PNS reduction for the analyzed X-axis of a commercial head gradient coil.

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