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In vitro MRI of mPEG-poly(Ala) hydrogels, hydrogels with CSPIO nanoparticles, and MIN6 cells mixed with hydrogels after incubating with or without chitosan-coated superparamagnetic iron oxide (CSPIO) nanoparticles. All were scanned by a 7.0 T MRI system. Gel only (A) was used as a negative control and Gel+CSPIO (B) was used as a positive control. In contrast to unlabeled MIN6 cells (C), CSPIO-loaded MIN6 cells (D) appeared as dark spots.
