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3 T MRI of an onion by employing spin echo imaging. a) Image captured in the absence of metamaterials. b) Image captured in the presence of NLMMs. c) Image captured in presence of the LMMs. NLMMs enhance the SNR by ≈15-fold along the bottom of the onion, as shown in (b). LMMs distort and induce artifacts, as shown in (c) due to the interaction between the LMM and the excitation and refocusing pulses in spin echo imaging. Scale bar is 5 cm.
