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This works reviews the application in Magnetic Resonance Imaging (MRI) of split-ring slabs with diferent values of permeability. The present work studied metamaterials media for Magnetic Resonant Imaging (MRI) with diferent values of permeability. Slabs with permeability -1 behave as super-lenses which are able to improve the localization of the magnetic field pattern of MRI coils. This finds application in parallel MRI techniques for reduction of acquisition time. Moreover, slabs with permeability 0 and infinity can locally increase the Signal-to-Noise-Ratio (SNR), which is the essential parameter in MRI.