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Abstract #3467

Mode-Weighting in Metasurface Designs for MRI Signal Enhancement

Lucas Knull1, Robert Kowal1,2,3, Max Joris Hubmann1,2,3, Daniel Düx1,4, Bennet Hensen1,4, Marcel Gutberlet1,4, Frank Wacker1,4, Oliver Speck1,2, and Holger Maune3
1Research Campus STIMULATE, Otto-von-Guericke University, Magdeburg, Germany, 2Biomedical Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Germany, 3Chair of Microwave and Communication Engineering, Otto-von-Guericke University, Magdeburg, Germany, 4Institute of Diagnostics and Interventional Radiology, Hannover Medical School, Hannover, Germany

Synopsis

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

Motivation: Resonators based on metamaterials (metasurfaces) can improve the imaging properties of the integrated MRI scanner coils.

Goal(s): The goal was to modify the resonance frequency of the metamaterial towards the Larmor frequency (mode-weighting) in order to achieve a higher SNR with these mode-weighted metasurfaces.

Approach: Simulations and MRI measurements of the mode-weighted metasurface were performed on a phantom to evaluate |B1-| maps, SNR maps and transmit decoupling.

Results: The mode-weighting caused an increase in simulated |B1-| maps of up to 20.1 % and for the measured SNR maps by 6 %. If the mode-weighting is too high the transmission decoupling progressively becomes worse.

Impact: It is possible to improve the reception sensitivity of metasurfaces coupled to the integrated spine coil by mode-weighting and thus optimize quasi cable-free MR imaging.

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