Minimum SAR for RF Shimming by Allowing Spatial Phase Variation

Yigitcan Eryaman¹, Celal Alp Tunc¹, Ergin Atalar¹

The ultimate value of SAR for MRI coils is calculated for a uniform target transmit profile. By keeping the magnitude of the field within given bounds, the target profile with the optimum phase distribution is calculated. The phase and magnitude of the resulting field distribution is presented. Reduction in whole body SAR in comparison to zero phase target sensitivity is calculated for different magnetic field strengths.