Imaging-Based Subject-Specific SAR Maps using B1-mapping and Electrical Properties Tomography in a heterogenous Brain Phantom

In this work a heterogeneous realistic brain phantom, with electric and magnetic properties in the range of healthy gray-matter and white-matter, was constructed. The phantom was scanned at 3 T where T1 maps, T2 maps, magnitude, and phase information of the B1 field were acquired. The electrical conductivity was derived using a convection reaction EPT approach and the E field was obtained by solving Ampere’s law from the B1 field. From this information, imaging-based subject-specific SAR maps were acquired and compared to simulation-based SAR maps. The analysis time (acquisition and SAR calculation) was under 6 minutes.