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SI as a function of time of echo (TE) in various concentration of CoFe2 O4 MNPs. Spin‐echo multisection pulse sequence with fix time of repetition (TR) of 2000 ms and different TEs ranging between 13.8 and 220 ms for T2 measurement at various concentrations (0.03–0.42 mM) that were prepared in the DI water and DI water played roles as a control sample
