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Abstract #3873

Towards Patient-Specific SAR Calculation for Parallel Transmission Systems

Ingmar Graesslin1, Shumin Wang2, Sven Biederer3, Giel Mens4, Bjoern Annighoefer5, Hanno Homann1, Jeff Duyn2, Paul Harvey4

1Philips Research Europe, Hamburg, Germany; 2NINDS, National Institutes of Health, Bethesda, MD, United States; 3Institute of Medical Engineering, University of Lbeck, Lbeck, Germany; 4Philips Healthcare, Best, Netherlands; 5TU Hamburg-Harburg, Hamburg, Germany

In parallel transmission, safety assessment via the specific absorption rate (SAR) is non-trivial, since local SAR distributions depend on the individual patient anatomy and on the multi-channel excitation. In general, patient safety can be achieved by carrying out simulation-based SAR calculations and by monitoring the deviation from the desired waveform. Typically, SAR calculations rely on generic patient models and on evaluation of worst-case scenarios. Patient-specific SAR calculations allow a more efficient exploitation of the respective limits and can improve imaging performance. This paper presents the general concept of patient-specific SAR calculations and describes the implementation of the real-time SAR computation.