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Abstract #1330

Probabilistic analysis of the SAR intersubject variability safety factor in parallel transmission MRI

Morgane Le Garrec1, Vincent Gras1, Marie-France Hang1, Guillaume Ferrand2, Michel Luong2, and Nicolas Boulant1

1DRF/I2BM/NeuroSpin, CEA, Gif sur Yvette, France, 2DRF/Irfu/SACM, CEA, Gif sur Yvette, France

Electromagnetic simulations remain to date the preferred method to assess the Specific Absorption Rate (SAR). Within that framework, taking into account the SAR intersubject variability by using a multiplicative safety factor on generic model results remains attractive due to its computational simplicity. Here we report a probabilistic analysis based on the unscented transform sampling scheme followed by the reconstruction of a polynomial approximation of the SAR with respect to head geometrical and position variables. Probabilities of exceeding a given SAR value in the population are returned and safety factors can be deduced based on risk over benefit ratio assessments.

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