Multi-body-model Method for Design of Mismatch-insensitive SAR-aware Parallel Transmit RF Pulses

Patient local SAR is usually controlled by way of estimations from numerical simulations on a library of tissue models. However, due to the variability between subjects in both anatomy shape and positioning within coil, mismatch between patient and model must be taken into account. We demonstrate that by using multiple body models with moderate degrees of mismatch it is possible to achieve significantly lower SAR than with a single model. The implication of this result is that, despite significant intersubject variability, relatively sparse body model libraries can be used without sacrificing robustness of SAR estimation.

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