Smart metasurfaces, special two-dimensional metamaterial devices, have a huge potential to drastically improve imaging efficiency in MRI and are a promising tool to overcome some of the limitations which are hampering technological advances in the field. The design, simulation, and experimental verification of thin, smart, non-linear metasurfaces is presented, which yield an up to eightfold enhanced signal-to-noise ratio in 3T MRI. The smart metasurface is a system of two inductively coupled structures, one of which has a non-linear, incident power-dependent behavior. On-bench characterization and MRI scans with a homogeneous phantom and a kiwi fruit prove the functionality and working principle.
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