Simulation Tool for 3T/7T Subject-Specific Multi-Transmission Applications without RF Measurements

Tamer S. Ibrahim¹, Lin Tang², Yik-Kiong Hue

This work presents a modeling mechanism that can accurately perform subject-specific B1 shimming and account for local/global SARs (without performing RF field measurements.) This model is capable of 1) maximizing the intensity of the B1+ field in an ROI, 2) homogenizing the distribution of the B1+ field in an ROI, 3) minimizing the average SAR over the whole load, and 4) minimizing the local SAR over the whole load. The technique was successfully tested on 3T and 7T whole-body systems equipped with multi-Tx array excitation systems and using both coupled and decoupled transmit arrays.