Abstract #1563

Wireless Split Ring Resonator Metasurface Enhances Transmission Efficiency of Surface Loop Arrays at 7T

Nandita M. Saha^1,2, Santosh Kumar Maurya³, Bilguun Nurzed^1,4, Helmar Waiczies⁵, Rita Schmidt³, and Thoralf Niendorf^1,2,5

¹Berlin Ultra High Field Facility, Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, ²Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, ³Department of Brain Sciences, Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel, ⁴Chair of Medical Engineering, Chair of Medical Engineering, Technische Universität Berlin, Berlin, Germany, ⁵MRI.TOOLS GmbH, Berlin, Germany

Synopsis

Keywords: Non-Array RF Coils, Antennas & Waveguides, High-Field MRI, Split Ring Resonator; Metamaterial surface; Loop Array

Motivation: Metasurfaces are conceptually appealing for enhancing RF coil performance due to added degrees of freedom for shaping electromagnetic fields.

Goal(s): This work focuses on development and validation of a novel split ring resonator (SRR) based metasurface for improving the performance of a two-channel surface loop array at 7.0 T.

Approach: Application of a magnetic field perpendicular to SRR induces electromotive force, forming an LC circuit with resonance frequency as currents circulate between the rings. This property benefits MRI transmission field enhancement.

Results: Our simulations and experimental results demonstrate that wireless metasurfaces enhance transmission efficiency of a two-channel surface loop coil array at 7T.

Impact: Our approach provides technical foundation for development, implementation and validation of novel metasurfaces for RF arrays customized for UHF-MRI. Our metasurface offers customizable resonance properties by adjusting unit cells, periodicity, or structure placement to enhance transmit field efficiency and uniformity.

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