Abstract #0562

Evaluation of Short Folded Dipole Antennas as Receive Elements of Ultra-High Field (UHF) Human Head Array.

Nikolai Avdievich¹, Georgiy Solomakha², Loreen Ruhm¹, Klaus Scheffler^1,3, and Anke Henning¹

¹High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Tübingen, Germany, ²Department of Nanophotonics and Metamaterials, ITMO University, St. Petersburg, Russian Federation, ³Department for Biomedical Magnetic Resonance, University of Tübingen, Tübingen, Germany

Increasing the number of surface loops in a human head receive (Rx)-array improves the peripheral SNR, while the central SNR doesn’t substantially change. Recent work demonstrated that optimal central SNR at UHF requires a contribution of two current patterns associated with a combination of loops and dipoles. A novel array consisting of 8 transceiver surface loops and 8 optimized folded Rx-dipoles was developed and tested. Addition of Rx-dipoles doesn’t substantially alter B₁⁺ field and the maximum local SAR. At the same time the new design improves both central and peripheral SNR as compared to the similar 16-element array with Rx-only vertical loops.

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