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Numerical study of RF exposure and the resulting temperature rise in the foetus during a magnetic resonance procedure

Heating of the subject during MRI examination due to power absorption from the applied radio-frequncy fields is a primary safety consideration. Absorbed power expressed as the specific absorption rate (SAR) is the surrogate quantity that is used as the measurement of subject temperature is not possible. In this paper we created anatomically accurate SAR models of pregnant subjects and performed both electromagnetic and thermal modeling including, for the first time, the maternal-fetal circulatory link though the umbilical cord. Fetal imaging by MRI is starting to become widespread, this paper is provides key evidence upon which safety assessments are being made.