Abstract #4085

Integrating RF coil with low-loss tuHDC ceramics at room temperature for large improvements in B1 fields and SNR, denoising for UHF 23Na MRSI

Hannes M. Wiesner¹, Byeong-Yeul Lee¹, Xiao-Hong Zhu¹, Maryam Sarkarat², Michael T. Lanagan², Qing X. Yang³, and Wei Chen¹

¹Department of Radiology, CMRR, University of Minnesota Medical School, Minneapolis, MN, United States, ²Department of Engineering Science and Mechanics, The Pennsylvania State College of Engineering, University Park, PA, United States, ³CNMRR, Department of Neurosurgery, The Pennsylvania State College of Medicine, Hershey, PA, United States

Integrating ultrahigh-dielectric constant (uHDC) materials with RF coils have improved MR imaging performance. In this work, we present a novel approach based on the permittivity tunable (tuHDC) ceramics, which has an extremely high tunability of permittivity from 2000-15000 by changing the ceramic temperature between few to 40 °C, for ²³Na MRSI at UHF. We demonstrate that the optimal temperature and performance of the tuHDC ceramic for ²³Na MRSI at 7T was at room temperature. We report spatially dependent increases in the RF transmission and reception fields and SNR with a large factor of ~4 accompanied by moderate global denoising effect.

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