Shorter wavelengths and higher frequencies at UHF contribute to complicated electric field distributions and higher power absorption in the human head leading to potential safety concerns. Scattering parameters, local and global SAR, and B1+ fields are calculated in an 8-channel surface loop Tx array simulated over 70 head-and-shoulder models of 10 tissue compartments. RF shimming methods and pulse sequences are analyzed over each model to demonstrate local and global SAR variation in a population. Patient proximity, coil loading and design, patient composition, and RF shim weights contribute to the variations in SAR and B1+ experienced by each subject.
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