Abstract #3666

RF safety assessment of a 7 Tesla breast coil: SAR versus tissue temperature limits

Thomas M. Fiedler¹, Mark E. Ladd^1,2, and Andreas K. Bitz¹

¹Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ²Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany

RF safety of Tx coils can be assessed based on SAR or temperature limits; however, temperature is directly correlated to tissue damage and enables a more precise RF exposure assessment. Both safety assessments were compared for a 7T breast coil. Temperature depends on the individual thermoregulation system and was taken into account using three different temperature-dependent blood perfusions. Results for a subject with impaired thermoregulation showed that temperature limits are exceeded by up to 6.17 °C even when SAR limits are complied with. For a healthy subject, up to 40% higher input power is allowed if temperature limits are applied instead of SAR.

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