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Abstract #4157

Repeatability of FDTD simulations for determining local SAR and B1+ distributions for UHF abdominal imaging.

Emma Doran1, Stephen Bawden1, Richard Bowtell1, Penny A. Gowland2, and Paul Glover1

1SPMIC, Physics, University of Nottingham, Nottingham, United Kingdom, 2University of Nottingham, Nottingham, United Kingdom

This study assessed the repeatability of FDTD simulations used to calculate local specific absorption rate (SAR) and B1+ distributions for abdominal imaging on a 7T (UHF) parallel transmit (pTx) system when subjected to typical small displacements of the an eight channel transmit dipole body array experienced when repositioning subjects. Simulations were repeated on two subject-based models and the maximum local 10g averaged SAR (SAR10g,av), B1+ distributions and scattering matrices (S-matrices) were compared to assess variation. The consequences that this has for MR safety, RF shimming and coil loading is discussed.

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