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
Berlin Ultrahigh Field Facility (B.U.F.F.),
Max Delbrck Center for Molecular Medicine, Berlin,
Technische Bundesanstalt, Berlin, Germany,
AG, Blach, Switzerland,
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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