Assessment of Radio Frequency Induced Heating On or Near Implants during MRI – some open issues
Mikhail Kozlov1,2 and Gregor Schaefers1,3
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 (Ptotal) 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 Ptotal 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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