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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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