Abstract #0748

Asymmetric Dipole Head Array for Ultra-High-Field Magnetic Resonance Imaging Turns “Dielectric Resonance” from an Enemy to a Friend.

Nikolai Avdievich¹, Georgiy Solomakha², Loreen Ruhm¹, Jonas Bause^1,3, Anke Henning^1,4, and Klaus Scheffler^1,5

¹Max Planck Institute for Bilogical Cybernetics, Tuebingen, Germany, ²Nanophotonics and Metamaterials, ITMO University, St.Petersburg, Russian Federation, ³Graduate School of Neural and Behavioral Sciences, Tuebingen, Germany, ⁴Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, United States, ⁵Department for Biomedical Magnetic Resonance, University of Tübingen, Tuebingen, Germany

We developed a novel 9.4T (400MHz) human head transceiver array consisted of 8 optimized bent folded dipole antennas. Due to an asymmetrical shape of dipoles (bending) and the RF shield, the array simultaneously excites two modes including a circular polarized mode of the array itself, and the TE mode of the human head. Mode mixing can be easily controlled by changing the folded length. As a result, the new array provides superior whole-brain coverage compared to various 8-element loop and dipole arrays or even to a more complicated 16-element loop array. In addition, the maximum local SAR is substantially reduced.

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