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Abstract #1453

Flip Angle and SAR Maps Induced by a Head Displacement in Parallel Transmission and with Cartesian Feedback

Nicolas Boulant1, Martijn Cloos1, Alexis Amadon1, Guillaume Ferrand2, Michel Luong2, Christopher Wiggins1, Denis Le Bihan1, David Ian Hoult3

1NeuroSpin, CEA, Gif sur Yvette, France; 2Irfu, CEA, Gif sur Yvette, France; 3Institute for Biodiagnostics, National Research Council, Winnipeg, MB, Canada

Despite the considerable variations one can observe in peak local SAR among all possible driving configurations of a Tx-array, the question of how robust both SAR and flip angle distributions are with respect to small perturbations remains. A head displacement for instance not only changes the solutions of Maxwells equations but also the tuning of the coils. Now Cartesian feedback has been proposed as a solution to the latter problem. We therefore present the results of simulations showing the effects of small rotations of the head upon the flip angle and SAR with and without Cartesian feedback being applied.