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. Author manuscript; available in PMC: 2014 Dec 9.
Published in final edited form as: Angew Chem Int Ed Engl. 2013 Oct 24;52(50):10.1002/anie.201306306. doi: 10.1002/anie.201306306

Figure 2.

Figure 2

(a) PET imaging of *As-SPION (in 0.25 mM HEPES buffer) with varied radioactivity level (from 0 to 1.50 MBq). (b) Digital photos and (c) corresponding T2*-weighted MR images of SPION@PAA with varied Fe concentrations from 0 to 15.5 mM. T2 relaxation time was too short to be measured at Fe concentrations equal to or exceeding 3.88 mM (indicated by dashed circles).