The RF heating of partially immersed implants in homogenous phantoms is reported to be highest for conductors at the resonant length. When addressing RF safety concerns, it is important to understand if these results apply to the heterogeneous structure within the human head. In this study, numerical simulations of RF heating of a partially immersed wire in an ASTM phantom are compared to an IT’IS virtual human model (Duke) for a head-only RF transmit coil in a 3 T MRI. We find that the resonant lengths are the same in both cases but the peak SAR changes slightly.
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