Abstract #3226

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

Synopsis

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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