Abstract #1413

Substantially Improved Receive Sensitivity of Human Whole-Brain MRI at 7T using a High-Permittivity Material (HPM) Slurry-Filled Helmet

Soo Han Soon^1,2, Matt Waks¹, Hannes M. Wiesner¹, Xiao-Hong Zhu¹, Michael T. Lanagan³, Qing X. Yang⁴, and Wei Chen^1,2

¹Center of Magnetic Resonance Research (CMRR), Department of Radiology, University of Minnesota, Minneapolis, MN, United States, ²Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, United States, ³Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA, United States, ⁴Center for NMR Research, Department of Neurosurgery and Radiology, College of Medicine, Pennsylvania State University, Hershey, PA, United States

Synopsis

Keywords: High-Field MRI, New Devices, High Permittivity Material (HPM), High Dielectric Constant (HDC) Material

Novel methods such as high-permittivity materials (HPM) and metasurfaces have improved RF coil transmission efficiency and receive field (B₁^-) sensitivity for MRI applications at ultrahigh field. One of the recent studies, which applied ceramic HPM helmet with the permittivity of 100, showed significant improvement in signal-to-noise ratio (SNR). Motivated from the previous studies with various forms of HPM at 3T and 7T, this study introduces an easy and accessible method with an HPM slurry helmet to largely improve imaging quality of human brain MRI at 7T, which could improve B₁^- field by 57% and SNR by 47%.

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