Abstract #2215

Assessment of Radio Frequency Induced Heating On or Near Implants during MRI – some open issues

Mikhail Kozlov^1,2 and Gregor Schaefers^1,3

¹MR:comp GmbH, Gelsenkirchen, Germany, ²Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany, ³Magnetic Resonance Institute for Safety, Technology and Research GmbH, Gelsenkirchen, Germany

We evaluated locations of maximum temperature rise (max(ΔT)) and the dependence of max(ΔT) on RF-induced power deposition (P_total) for some generic implants. ΔT spatial and temporal variations were investigated. To fulfill ASTM F2182-11a setup requirements, the temperature probe should be placed with submillimetre precision at location that cannot be predicted by a full wave electromagnetic simulation alone. It is a challenge to validate with small uncertainty P_total calculated using EM simulation by only measuring SAR or VLD value at some points in space, if the field probe sensor size is larger than one tenth of the wire diameter.

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