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Abstract #0548

Direct control of the temperature rise in parallel transmission via temperature virtual observation points: simulations at 10.5 T

Nicolas Boulant 1 , Xiaoping Wu 2 , Gregor Adriany 2 , Sebastian Schmitter 2 , Kamil Ugurbil 2 , and Pierre-Francois Van de Moortele 2

1 NeuroSpin, CEA, Saclay, Ile de France, France, 2 Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

We report a parallel transmission radiofrequency pulse design algorithm under strict temperature rise constraints. The latter are directly enforced by using an equivalent SAR virtual observation point model, this time based on temperature that we shall name T(Temperature)VOPs. Simulations are performed at 10.5 T with a 16 channels coil on the Duke head model, and with Time-Of-Flight sequences of various durations. The algorithm here benefits from the lack of direct correspondence between the SAR and temperature to return in all cases more powerful and safer RF pulses than the ones returned by a traditional SAR-constrained pulse design.

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