Figure 7

T1-Weighted MR images of various Gd3+ concentrations of NaGdF4@CaCO3-PEG (A); relaxation rate r1 (1/T1) against different Gd3+ concentrations of NaGdF4@CaCO3-PEG (B).

T1-Weighted MR images of various Gd3+ concentrations of NaGdF4@CaCO3-PEG (A); relaxation rate r1 (1/T1) against different Gd3+ concentrations of NaGdF4@CaCO3-PEG (B).