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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