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Abstract #0177

En Route to Ultrahigh Field Cardiac MR in Patients: RF Safety Assessment of Intracoronary Stents at 7.0 T Using Numerical Simulations and E-Field Measurements

Eva Oberacker 1 , Lukas Winter 1 , Frank Seifert 2 , Jaroslav Marek 1 , Gerd Weidemann 2 , Eugen Hofmann 3 , and Thoralf Niendorf 1,4

1 Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrck Center for Molecular Medicine, Berlin, Berlin, Germany, 2 Physikalisch Technische Bundesanstalt, Berlin, Germany, 3 Biotronik AG, Blach, Switzerland, 4 Experimental and Clinical Research Center, a cooperation of the Charit Medical Faculty and the Max Delbrck Center for Molecular Medicine, Berlin, Germany

This work performs a careful safety evaluation of RF induced heating of coronary stents including electromagnetic (EM) simulations and E-field measurements. Complex electromagnetic field coupling is investigated depending on stent type, length, location, orientation, vessel diameter and RF coil used. Electromagnetic (EM) and thermal simulations were performed in phantoms and human voxel models and validated in ASTM phantom measurements. The results are transferrable to various RF coil designs and may be utilized to estimate safe RF exposure levels for SAR personalized UHF-MR exams including patients with intracoronary and other vascular stent implants.

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