Design of ultrahigh dielectric constant uHDC helmet for 3T and its intrinsic resonance modes
Xinlian Chen1, Navid P. Gandji2, Christopher T. Sica2, Gary W. Yang3, Parisa Lotfi Poshtgol2, Hannes M Wiesner4, Xiao-Hong Zhu4, Michael Lanagan5, Wei Chen4, Qing X Yang2, and Xuegang Xin1
1Department of Biomedical Engineering, South China University of Technology, GuangDong, China, 2Departments of Neurosurgery and Radiology, College of Medicine, Pennsylvania State University, Hershey, PA, United States, 3Departments of Computer Science and Engineering, Pennsylvania State University, Hershey, PA, United States, 4Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 5Department of Engineering Science and Mechanics, Pennsylvania State University, Hershey, PA, United States
This investigation characterize the intrinsic resonance modes (IRM) in a helmet made from utrahigh dielectric constant (uHDC) material and their interactions with RF field produced by conventional array coils using numerical simulation. The RF field of the three lower order modes, TE, TM1 and TM2, were investigated. TM1 mode produces uniform H-field in the transverse plane inside the helmet similar to that of a birdcage coil. TM2 mode produces a strong RF field but with a large gradient. Understanding of the IRMs of large uHDC structures such as helmets provides theoretical foundation for wider applications of uHDC materials RF engineering.
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