Abstract #2314

Influence of E-Field Homogeneity and Drift for Testing Medical Implants for RF-induced heating at 64MHz according to ASTM-F2182 and ISO/TS 10974

Finya Ketelsen^1,2, Vincent Hammersen¹, Kevin Kröninger², and Gregor Schaefers^1,3

¹MRI-STaR - Magnetic Resonance Institute for Safety, Technology and Research GmbH, Gelsenkirchen, Germany, ²TU Dortmund University, Dortmund, Germany, ³MR:comp GmbH, Testing Services for MR Safety & Compatibility, Gelsenkirchen, Germany

Medical implants of all kind must be tested for RF-induced heating to determine their MR safety and compatibility. Test conditions concerning E-field homogeneity and E-field drift during assessment time are defined in ISO/TS 10974 and ASTM-F2182. This study evaluates the influence of E-field drift and E-field homogeneity on RF-heating. It shows that both effects can lead to a temperature underestimation. Even for small implants whose volume is in a homogenous area within ±1dB, this underestimation can occur. System instability and implant size and position can further increase the underestimation of RF-induced heating and should be carefully considered.

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