Simple anatomical measurements do not correlate significantly to individual peripheral nerve stimulation thresholds as measured in MRI gradient coils

Journal of Magnetic Resonance Imaging : JMRI
B A Chronik, Meena Ramachandran

Abstract

To examine peripheral nerve stimulation (PNS) thresholds for normal human subjects in magnetic resonance imaging (MRI) gradient coils, and determine if observed thresholds could be predicted based on gross physiologic measurements. PNS thresholds for 21 healthy normal subjects were measured using a whole-body gradient coil. Subjects were exposed to a trapezoidal echo-planar imaging (EPI) gradient waveform and the total change in gradient strength (DeltaG) required to cause PNS as a function of the duration of the gradient switching time (tau) were measured. Correlation coefficients and corresponding P values were calculated for the PNS threshold measurements against simple physiologic measurements taken of the subjects, including weight, height, girth, and average body fat percentage, in order to determine if there were any easily observable dependencies. No convincing correlations between threshold parameters and gross physiologic measurements were observed. These results suggest it is unlikely that a simple physiologic measurement of subject anatomy can be used to guide the operation of MRI scanners in a subject-specific manner in order to increase gradient system performance while avoiding PNS.

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Citations

Apr 24, 2004·Biomedical Engineering Online·Domenico Formica, Sergio Silvestri
May 12, 2005·Bioelectromagnetics·William H Bailey, John A Nyenhuis
Jun 16, 2009·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Rebecca E FeldmanBlaine A Chronik
May 9, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Weihua MaoChristopher M Collins
Feb 2, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Rebecca E FeldmanBlaine A Chronik
May 24, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Silvia S Hidalgo-TobonRichard Bowtell
Oct 13, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bryan J RecoskieBlaine A Chronik
May 8, 2013·IEEE Transactions on Medical Imaging·Emine U SaritasSteven M Conolly
Aug 16, 2012·IEEE Transactions on Bio-medical Engineering·Esra A TurkErgin Atalar
Jul 2, 2015·Medical Physics·Emine U SaritasSteven M Conolly
Aug 11, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Mathias DavidsLawrence L Wald
Dec 3, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Seung-Kyun LeeJohn F Schenck

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