Reliable and robust RF safety assessment of transmit array coils at ultrahigh fields

A reliable simulation based assessment of RF safety of pTX-coil-arrays requires an elaborate estimation of upper limits of local SAR for all reasonable steering conditions and model assumptions. Limiting the forward power of each individual transmit channel is the simplest and most reliable approach to comply with applicable safety standards. For these circumstances we propose a simple estimation procedure to find an upper limit for local SAR from the Q-matrix. When applying this procedure to a 7T 8-channel transmit head coil the resulting local SAR related power limit is only 25 percent lower than the power limit for the head SAR which has to be maintained anyway.

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