To assess the MR safety of an active catheter, the interaction of an arbitrary E-field with an isolated transmission line was modeled analytically in cascaded lossy media. The catheter tip SAR was calculated for different E field configurations and termination impedances that were controlled by an input impedance unit integrated into the receiver interface circuit. Results of the analytical calculations were compared to transfer function (TF) measurements, and found to be in good agreement. By adjusting the input impedance, SAR at the tip of an active catheter could be reduced by 95%.
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