Simple linear formulation for magnetostimulation specific to MRI gradient coils

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
B A Chronik, B K Rutt

Abstract

A simple linear formulation for magnetostimulation thresholds specific to MRI gradient coils is derived based on established hyperbolic electrostimulation strength vs. duration relations. Thresholds are derived in terms of the gradient excursion required to cause stimulation, and it is demonstrated that the threshold curve is a linear function of the gradient switching time. A parameter beta is introduced as being fundamental in the evaluation of gradient coil stimulation. beta is a map of the induced electric field per unit gradient slew rate, and can be calculated directly from the gradient coil wire pattern. Consideration of beta alone is sufficient to compare stimulation thresholds between different gradient coil designs, as well as to evaluate the expected dependency of stimulation threshold on position within the gradient coil. The linear gradient threshold curve is characterized by two parameters: SR(min) and DeltaG(min). SR(min) is the slope of the threshold curve and represents the minimum slew rate required to cause stimulation in the limit of infinite gradient strength. DeltaG(min) is the vertical axis intercept of the curve and represents the minimum gradient excursion required to cause stimulation in the limit of i...Continue Reading

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Citations

Jul 31, 2001·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·B A Chronik, B K Rutt
Oct 13, 2001·NMR in Biomedicine
Nov 1, 2003·Magma·P MansfieldB Haywood
Sep 28, 2002·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Martin Brand, Oliver Heid
Sep 28, 2002·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·D TomasiE L Vidoto
Feb 18, 2010·Concepts in Magnetic Resonance. Part B, Magnetic Resonance Engineering·Dennis L ParkerFranz Schmitt
Feb 17, 2010·NeuroImage·Nora D VolkowMillard Jayne
Apr 22, 2017·Physiological Measurement·Julien Oster, Gari D Clifford
Jul 6, 2004·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Scott B ReederElliot R McVeigh
Jun 20, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Beibei ZhangBrian K Rutt
Jul 24, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Martin BencsikRoger M Bowley
Feb 2, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Rebecca E FeldmanBlaine A Chronik
Oct 26, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Dennis L Parker, J Rock Hadley
Mar 28, 2008·Physics in Medicine and Biology·P Mansfield, B Haywood
Jun 16, 2009·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Rebecca E FeldmanBlaine A Chronik
Aug 3, 2004·Physics in Medicine and Biology·Peter T While, Larry K Forbes
Dec 3, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Seung-Kyun LeeJohn F Schenck
Jan 12, 2021·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Yao LuSteven Conolly
Jun 4, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Peter B RoemerBrian K Rutt
Aug 25, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Mathias DavidsLawrence L Wald

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