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Various phantoms are used to predict the specific absorption rate (SAR) in a human head for radio-wave exposure. To study a head phantom for estimating the SAR due to microwave exposure, this paper numerically examines the dependence of the surface-SAR on head tissue structure in two kinds of head models : an anatomically detailed head-model and realistic shaped homogeneous model. The finite-difference time-domain method is used to compute the surface-SAR for 750 MHz and 1.5 GHz far-field exposures. The spatial patterns of the one-gram averaged suface-SAR are compared between the above head models. Their correlation relationships are also discussed. The findings obtained here suggest that in experimentally predicting the surface-SAR in a human head for microwave exposure, a realistic shaped homogeneous head model can be used as a head phantom.

Tissue Structure Dependence of Surface-SAR in a Human Head for Microwave Far-Field Exposure