Formula for Estimating Whole-body Average SAR in Human Models Due to Plane-wave Exposure at Resonance Frequency

摘要

This study proposes an equation for estimating whole-body average specific absorption rate (WBSAR) in the human body models for plane-wave exposure at whole-body resonance frequency. The necessity of this study is that the WBSAR takes maximal at that frequency and is close to the basic restriction in international guidelines / standards for human protection. Thus, much attention is paid to the variability of whole-body average SAR at that frequency. In this study, first, dominant factors influencing the resonance frequency of the human body models is investigated for plane-wave exposures. Then, an equation for estimating WBSAR at the resonance frequency is proposed on the basis of analogy with an antenna. This equation can estimate the WBSAR with the body mass index of the human body only for a given incident power density. The uncertainty of the WBSAR estimated with the equation is at most 10%, which is mainly attributed to the electrical constants of tissue, including inhomogeneity of human body model.