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Abstract #4508

Large benefit of RF coil B1 efficiency for X-nuclear MRS at ultrahigh field beyond the gyromagnetic ratio advantage of proton

Xin Li1, Hannes M. Wiesner1, Xiao-Hong Zhu1, and Wei Chen1
1Center for Magnetic Resonance Research (UMN), Minneapolis, MN, United States


In this study, we conducted electromagnetic simulation of a surface loop coil to quantify the B1+ transmit efficiency of five nuclei ( 1H, 31P, 23Na, 2H and 17O) from 1.5T to 21 T field strength. The simulation is validated by FID measurements. Furthermore, we investigated the loading effect on the RF coil B1+ transmit efficiency and its dependence on B0. Our study shows the X-nuclei flip angle can be reached using the same or even less coil driving voltage as for proton, thus, significantly reducing the required RF power and SAR concern.

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