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. 2022 Apr 26;35(6):875–894. doi: 10.1007/s10334-022-01007-5

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Fig. 17 — a ¹H images at 7 T with and without the double-tuned metasurface in place. A double-tuned birdcage coil was used for transmit/receive. b ³¹P spectra from two different-sized voxels (the small voxel in blue corresponds to the volume of maximum signal enhancement, the larger voxel in green is the combination of the four voxels with the highest enhancement. c phosphocreatine (PCr) image with the metasurface and a map of enhancement ratio compared to without the metamaterial. Figures reproduced from [77]