Optimization and validation of dipole antenna geometry for body imaging at 10.5T
Bart R. Steensma1, Pierre-Francois van de Moortele2, Arcan M. Erturk2, Andrea Grant2, Gregor Adriany2, Gregory J. Metzger2, and Alexander J.E. Raaijmakers1,3
1Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 3Biomedical Image Analysis, Eindhoven University of Technology, Eindhoven, Netherlands
Body MRI at 10.5T shows potential for improving signal-to-noise ratio compared to 7T, but is limited by increased specific absorption rate (SAR) levels. In this work, the geometry of a dipole antenna is optimized for body imaging with low SAR levels at 10.5T. The optimized dipole geometry is compared to a previous design in simulations on a human model, where it is shown that SAR levels can be decreased by 36% for an equal transmit efficiency. Simulations are validated by magnetic resonance thermometry and B1+-mapping experiments with a 12-channel multi-transmit array.
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