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Abstract #0383

B1-based SAR determination for local RF transmit coils

Ulrich Katscher 1 , Marina Braun 2 , Christian Findeklee 1 , Christoph Leussler 1 , Ingmar Graesslin 1 , Peter Vernickel 1 , and Michael Morlock 2

1 Philips Research Europe, Hamburg, Germany, 2 University of Technology, Hamburg, Germany

For safety management, local SAR is usually estimated via models, but could alternatively be estimated from individually measured B1-maps. A key issue of this method is that the longitudinal component of B1, Bz, cannot be measured via MRI, and thus, has to be estimated. Satisfactory results were reported assuming Bz = 0 for birdcage-type coils, which is less valid for the upcoming type for local surface RF coils, particularly near transversely oriented conductors. This study investigates different ways for Bz modelling and the resulting impact on local SAR, based on phantom / realistic patient model simulations at 3 T.

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