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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 Bause1,3, Anke Henning1,4, and Klaus Scheffler1,5
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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