M. Arcan Erturk1, Gregor Adriany1, Pierre-Francois Van de Moortele1, Yigitcan Eryaman1, Alexander J Raaijmakers2, Lance DelaBarre1, Edward Auerbach1, J. Thomas Vaughan1, Kamil Ugurbil1, and Gregory J Metzger1
1Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 2Imaging Division, UMC Utrecht, Utrecht, Netherlands
We have developed a fractionated dipole antenna (fDA) for
body imaging at 10.5T, investigated its electro-magnetic field behavior in a
10-channel array using numerical simulations in a human model, and compared its
performance to a 10-channel fDA array at 7.0T. The 10.5T fDA array provided
similar B1+ transmit efficiency and peak 10g-averaged SAR compared to the 7.0T
array inside the prostate, however had a less uniform B1+ distribution.
Simulation results indicated that fDA elements have sufficient B1+ penetration
at 10.5T, but B1+ non-uniformities may need to be alleviated even in small
imaging targets using dynamic RF strategies including parallel transmit.