Abstract #2631

Smaller is better: Averaging mass considerations for the assessment of RF power deposition and MR safety of small implants

Eva Oberacker¹, Celal Oezerdem¹, Lukas Winter¹, and Thoralf Niendorf^1,2,3

¹Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, ²Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, ³MRI.TOOLS GmbH, Berlin, Germany

Assessment of the specific absorption rate (SAR) is a crucial tool when investigating the MR safety of implants. For RF power deposition assessments, local SAR averaged over m=10g of tissue is standard. Given the density in the human body (ρ≈1g/cm³), this translates into a volume of ≈2x2x2cm³, which largely exceeds the size of many small implants and bears the risk of heavy underestimation of local peak SAR. Realizing these constraints together with the opportunities, we investigated discrete SAR averaging masses from m_ave=1g to m_ave=0.01g to define SAR averaging masses suitable for the safety assessment of small implants.

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