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Dosimetry Evaluation and Tissue Structure Dependence of Localized Peak SAR inside Head Model for 1.5GHz Microwave Far-field Exposure Takuji USHIMOTO, Non-member, Jianqing WANG, Non-member, Osamu FUJIWARA, Member (Faculty of Engineering, Nagoya Institute of Technology, Nagoya-shi, 466-8555 Japan) We investigated the relationship between the constituent tissue number and the localized peak SARs (specific absorption rate) inside an our newly developed MRI (Magnetic Resonance Imaging) based head model for far-field exposure with respect to all irradiating directions of the microwaves being employed for portable telephones. The FDTD (Finite-Difference Time-Domain) method was used to compute the SARs inside the MRI based head models consisting of various tissues up to fifteen kinds for 1.5 GHz microwave far-field exposure of 1 mW/cm2 specified in an uncontrolled environment. As a result, we found that in the head model having less than three kinds of tissue, the localized peak SAR reaches maximum for side irradiation, decreasing with increasing the tissue kind, while in the head model with more than four kinds of tissue, the localized peak SAR reaches maximum for rear irradiation, whose value increases with the tissue kind and reaches saturation point for over five tissues including skin, fat, muscle, bone, and brain. The latter finding suggests that the head model having the above five tissues at most can be used enough for dosimetry evaluation with high accuracy.