Direct control of the temperature rise in parallel transmission by means of temperature virtual observation points: Simulations at 10.5 Tesla

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
N BoulantPierre-François van de Moortele

Abstract

A method using parallel transmission to mitigate B1+ inhomogeneity while explicitly constraining the temperature rise is reported and compared with a more traditional SAR-constrained pulse design. Finite difference time domain simulations are performed on a numerical human head model and for a 16-channel coil at 10.5 Tesla. Based on a set of presimulations, a virtual observation point compression model for the temperature rise is derived. This compact representation is then used in a nonlinear programming algorithm for pulse design under explicit temperature rise constraints. In the example of a time-of-flight sequence, radiofrequency pulse performance in some cases is increased by a factor of two compared with SAR-constrained pulses, while temperature rise is directly and efficiently controlled. Pulse performance can be gained by relaxing the SAR constraints, but at the expense of a loss of direct control on temperature. Given the importance of accurate safety control at ultrahigh field and the lack of direct correspondence between SAR and temperature, this work motivates the need for thorough thermal studies in normal in vivo conditions. The tools presented here will possibly contribute to safer and more efficient MR exams.

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Citations

Oct 23, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·M Arcan ErtürkGregory J Metzger
Oct 26, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Simone A WinklerBrian K Rutt
Oct 30, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·William A GrissomAlexey A Samsonov
Apr 4, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Yiğitcan EryamanJ Thomas Vaughan
Jul 31, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Aurelien DestruelStuart Crozier
Oct 18, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Giuseppe Carluccio, Christopher M Collins
Nov 15, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Mihir PendseBrian Rutt
Feb 26, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Aurelien DestruelStuart Crozier
Jun 13, 2019·Topics in Magnetic Resonance Imaging : TMRI·Cem M Deniz
Aug 19, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xianglun MaoJoseph V Rispoli
Sep 17, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Caroline Le SterNicolas Boulant
Feb 19, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vincent GrasNicolas Boulant
Feb 12, 2017·NMR in Biomedicine·Cem M DenizChristopher Collins
May 7, 2021·NMR in Biomedicine·Bart R SteensmaAlexander J E Raaijmakers
Aug 17, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Berk SilemekLukas Winter

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