VLADIMIR IOSIFOVICH KONDRASHOV (obituary)

Abstract

This study computationally assessed the temperature elevations due to electromagnetic wave energy deposition during magnetic resonance imaging in non-pregnant and pregnant woman models. We used a thermal model with thermoregulatory response of the human body for our calculations. We also considered the effect of blood temperature variation on body core temperature. In a thermal equilibrium state, the temperature elevations in the intrinsic tissues of the woman and fetal tissues were 0.85 and 0.61 • C, respectively, at a whole-body averaged specific absorption rate of 2.0 W kg −1 , which is the restriction value of the International Electrotechnical Commission for the normal operating mode. As predicted, these values are below the temperature elevation of 1.5 • C that is expected to be teratogenic. However, these values exceeded the recommended temperature elevation limit of 0.5 • C by the International Commission on Non-Ionizing Radiation Protection. We also assessed the irradiation time required for a temperature elevation of 0.5 • C at the aforementioned specific absorption rate. As a result, the calculated irradiation time was 40 min.