Inductively Coupled Planar TX Coils: Analysis of B 1 + Efficiency and SAR Performance
Johanna Schpfer 1,2 , Klaus Huber 2 , Stephan Biber 3 , Markus Vester 3 , Sebastian Martius 2 , and Martin Vossiek 1
LHFT, University of Erlangen-Nuremberg,
AG, Corporate Technology, Erlangen, Germany,
AG, Healthcare, Erlangen, Germany
High SAR values can increase imaging time, especially if
very high B1+ fields are required. In this study,
potential benefits of inductively coupled planar loop
antennas, designed to focus the transmit field, are
evaluated and compared to the transmit characteristics
of the body coil. It shows that the inserted loop leads
to reduced power requirements and SAR without
significantly decreasing B1+ homogeneity in the defined
ROI, relative to standard excitation with the body coil.
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