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Magnetic property of GO-IONP-PEG and in vivo biodistribution of particles. (a) Schematic illustration of the preparation of GO-IONP-PEG. (b) T2-weighted MR images and T2 transverse relaxivity (R2) of GO-IONP-PEG solutions at different iron concentrations. (c) T2-weighted MR images of 4T1 tumor-bearing mice before and 24 h after intravenous injection of GO-IONP-PEG. GO-IONP-PEG is abundant in the host-tumor interface (arrow).
