Effect of Dielectric Resonator (DR) Modes on RF-Magnetic Field
Parisa Lotfi Poshtgol1, Navid Pourramzan Gandjii1, Michael Lanagan2, Eugene Furman3, Soo Han Soon4, Xinlian Chen5, Saber Soltani6, Xiao-Hong Zhu4, Christopher T. Sica1, Hannes M Wiesner4, Wei Chen4, kamil Ugurbil4, and Qing X Yang1
1Departments of Neurosurgery and Radiology, College of Medicine, Pennsylvania State University, Hershey, PA, United States, 2Department of Engineering Science and Mechanics, Pennsylvania State University, State college, PA, United States, 3Materials Research Institute, Pennsylvania State University, State college, PA, United States, 4Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 5Department of Biomedical Engineering, South China University of Technology, Guangzhou, China, 6Department of Electrical Engineering, The Pennsylvania State University, State college, PA, United States
Dielectric resonators with Ultra-High Dielectric Constant (uHDC) materials possess intrinsic resonance modes that have been used for RF transmission and reception. The resonance modes and conditions of the uHDC discs were studied through computer simulations. We compared the B1+ field and RX-sensitivity when employing cylindrical uHDC discs at both resonant and non-resonant conditions. We showed in this work, to achieve the best focusing effect into phantom, the design with uHDC material should operate around the first TE01δ mode and lower than the second mode TE01δ with the highest permittivity.
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