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Abstract #4193

Tier based formalism for RF safety assessment of custom-built RF coils providing flexibility in the tradeoff between effort and overestimation

Bart Steensma1, Peter Luijten1, Dennis Klomp1, Nico van den Berg2, and Alexander Raaijmakers1,3
1Center for Image Sciences, Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Center for Image Sciences, Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands, 3Biomedical Engineering, Medical Image Analysis, Eindhoven University of Technology, Eindhoven, Netherlands

We propose an RF safety assessment formalism that uses four tier levels to quantify the accuracy of SAR modeling. Each subsequent tier level consists of more modeling and validation efforts while reducing the overestimation of peak SAR levels. The lowest tier level requires no simulations or measurements whereas the highest tier level includes B1+ and thermometry-based validations. The formalism defines a safety factor to account for deviations between the simulation model and the subject adding errors with the sum-of-squares method. A tier 3 validation and error propagation procedure was conducted for a 7T prostate array.

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