This simulation study compares two concepts ensuring IEC-compliant SAR values for parallel transmission (pTx) in respect to their robustness against subject- and position-changes: 1) direct SAR assessment (SL) and 2) an amplitude limit for all pTx channels (AL). For the example case of a 3T pTx body coil, SL resulted in ten-fold the allowed SAR in one model for the same excitation vector that obeys IEC limits in another model. For AL, less than twice the SAR was found in this case. AL allows for a lower safety factor, therefore, resulting in a higher mean(B1+) compared to SL.
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