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. Author manuscript; available in PMC: 2015 Sep 9.
Published in final edited form as: ACS Nano. 2014 Mar 26;8(4):3876–3883. doi: 10.1021/nn500722y

Figure 4.

Figure 4

(a) T2-weighted MR images of the Fe3O4@PDA NCs in aqueous solution at different Fe concentrations. (b) Corresponding T2 relaxation rate of the Fe3O4@PDA NCs as a function of Fe concentration. (c) T2-weighted MR images of MCF-7 cells (5 × 105) incubated with the Fe3O4@PDA NCs at different Fe concentrations. (d) PA images and (e) corresponding PA intensity of the Fe3O4@PDA NCs with different concentrations. (f) PA images of MCF-7 cells (5 105) incubated with different concentrations of Fe3O4@PDA NCs.