FDTD Computation of Temperature Elevation in Human Body for RF Far-Field Exposure

This paper investigated specific absorption rate and temperature elevation in an anatomically-based human model for RF far-field exposure. First, we investigated the effect of blood temperature variation and thermoregulation modeling on body-core temperature. The modeling of blood temperature variation was found to be the dominant factor influencing the body core temperature. This is because the temperature in the inner tissues is elevated via the circulation of blood warmed due to EM absorption. For the same whole-body average SAR at different frequencies, the body-core temperature elevation was almost same, suggesting the effectiveness of the measure used in the ICNIRP guidelines. Then, we discussed the effect of sweating rate on the temperature elevation and thermal time constant of blood temperature. The uncertainty of temperature elevation due to the sweating rate was 30 % or so.