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(a) (i) TEM image of USMnO@ZDS NPs and in vivo T1 MR images of mouse brains, before (labeled as “0”) and 0.5 h after intravenous injection of (ii) USMnO@ZDS and (iii) USMnO@DMSA at 9.4 T [79]. (b) (i) TEM image of uncoated Mn3O4 NPs and (ii) T1 MR images of Balb/c nude mice bearing a nasopharyngeal carcinoma xenografted tumor (indicated with white arrows), before (labeled as “0”) and 30 min after intravenous injection of Mn3O4 NPs at 3 T [81].
