Abstract #0138

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. Raaijmakers^1,3

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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