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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