Simplified computational models of medical devices for accurate RF heating simulations with significantly reduced computational cost
Alan Ross Leewood 1 , Beth J Hess 1 , Matthew Huser 1 , Sharath Gopal 1 , Gonzalo G. Mendoza 2 , Maria Ida Iacono 2 , Wolfgang Kainz 2 , Sunder S Rajan 2 , and Leonardo M Angelone 2
MED Institute, Inc., West Lafayette, IN,
for Devices and Radiological Health, U.S. Food and Drug
Administration, Silver Spring, MD, United States
Many medical implants are geometrically complex and
often feature very small structures. This research
presents an analysis of RF-induced heating based on two
examples of computational geometric simplified models.
Computational simulations were performed to at 128 MHz
with two different devices (an 80-mm Nitinol
self-expanding stent and an 80-mm stainless steel
orthopedic screw) in the ASTM phantom. For each device,
a full geometric fidelity and a defeatured model were
generated. The defeatured models allowed for significant
reduction in computational cost (up to 75%) while
showing small (less than 10%) difference of predicted
RF-induced heating compared to the full featured model.
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