Abstract #1572

Potential of Metasurface Resonators for Low-Field MRI Systems

Robert Kowal¹, Max Joris Hubmann^1,2,3, Lucas Knull^1,3, Daniel Düx^1,4, Marcel Gutberlet^1,4, Bennet Hensen^1,4, Florian Maier², Frank Wacker^1,4, Oliver Speck^1,5, and Holger Maune³

¹Research Campus STIMULATE, Otto-von-Guericke University, Magdeburg, Germany, ²Siemens Healthcare GmbH, Erlangen, Germany, ³Chair of Microwave and Communication Engineering, Otto-von-Guericke University, Magdeburg, Germany, ⁴Institute of Diagnostics and Interventional Radiology, Hannover Medical School, Hannover, Germany, ⁵Biomedical Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Germany

Synopsis

Keywords: Non-Array RF Coils, Antennas & Waveguides, Non-Array RF Coils, Antennas & Waveguides, Metamaterial, Metasurface

Motivation: Although lower B₀ field strength generally lead to lower SNR, metasurface resonators can greatly increase the sensitivity of scanner-integrated coils to practically perform wireless imaging.

Goal(s): This work investigates the dependence of the resonance frequency on metasurface enhancements and evaluates the potential towards developments designed for low-field applications.

Approach: The capabilities of three geometrically identical metasurfaces were experimentally compared at field strengths of 0.55T, 1.5T and 3T. Images were acquired using the table-integrated spine-coils.

Results: The achieved SNR enhancements beneath the metasurface increased with lower field strength and were highest at 0.55T with 27-fold gain.

Impact: The significant SNR gain achieved at low-field paves the way for further development and implementation of wireless metasurface technologies in MRI. As flexible and cost-effective alternatives or additions to conventional coils, they can additionally ease patient postitioning.

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