Journal
PHYSICS IN MEDICINE AND BIOLOGY
Volume 55, Issue 8, Pages 2411-2426Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0031-9155/55/8/018
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) [20760218, 21-0744]
- Grants-in-Aid for Scientific Research [20760218] Funding Source: KAKEN
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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 degrees 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 degrees C that is expected to be teratogenic. However, these values exceeded the recommended temperature elevation limit of 0.5 degrees C by the International Commission on Non-Ionizing Radiation Protection. We also assessed the irradiation time required for a temperature elevation of 0.5 degrees C at the aforementioned specific absorption rate. As a result, the calculated irradiation time was 40 min.
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