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Abstract #0412

SAR Management in pTx Sequence Design: The Impact of Electromagnetic-Field-Derived Virtual Observation Points

Sydney Nicole Williams1, J├╝rgen Herrler2, Patrick Liebig3, Paul McElhinney1, Shajan Gunamony1,4, Armin M. Nagel5, and David A. Porter1
1Imaging Centre of Excellence, University of Glasgow, Glasgow, United Kingdom, 2Department of Neuroradiology, University Hospital Erlangen, Erlangen, Germany, 3Siemens Healthineers, Erlangen, Germany, 4MR CoilTech Limited, Glasgow, United Kingdom, 5Institute of Radiology, University Hospital Erlangen, Erlangen, Germany

We compare two methods for estimating local SAR with virtual observation points (VOPs) in a commercial and a self-built 8Tx/32Rx head coil, respectively. The commercial coil relies on a constant safety factor that reduces the hardware power limits in each transmit channel, where the self-built coil derives the VOPs from coil electromagnetic field (EMF) simulations. We show the use of both coils in vivo with MPRAGE using Universal and subject-specific pTx pulses. The EMF-based VOPs, used with the self-built coil, resulted in a lower local SAR estimate for a similar image quality, providing more flexibility in pulse sequence design.

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