In Vivo RF Power and SAR Calibration for Multi-Port RF Transmission

Yudong Zhu¹

To better manage SAR in parallel RF transmission one must complement real-time monitoring with a more proactive scheme. In principle, for RF pulse design one can explicitly minimize SAR by guiding the design with a predictive SAR model. In this work we developed a practical method that is capable of establishing such a model under in vivo imaging conditions. The model predicts, for any set of RF pulse waveforms or shimming coefficients, the overall SAR of the multi-port operation. A connection with an established multi-port system theory as well as preliminary experimental data offered a validation for the method.