Abstract #4154

Assessment of the Alleviating Impact of Perfusion on RF-induced Heating due to Artificial Cardiac Valves

Peter R. S. Stijnman^1,2, Bastiaan J. van Nierop¹, Janot P. Tokaya¹, Peter R. Luijten¹, Josien P. W. Pluim², Cornelis A.T. van den Berg¹, and Alexander J.E. Raaijmakers^1,2

¹Center for Image Sciences, UMC Utrecht, Utrecht, Netherlands, ²Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

Artificial cardiac valves or stents can cause RF induced heating of the surrounding tissue. However, these implants are probably cooled effectively by the blood flow passing by, which is not considered by current safety assessment practices. Therefore, in this work we examine the alleviating impact of blood flow cooling. This is done through electromagnetic and thermal simulations in a phantom and human setup. Multiple standard implant geometries are simulated plus a very conservative situation, a resonant ring. From these simulations it is seen that for realistic MRI exposure conditions none of the investigated cases is considered a safety hazard.

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