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(a) Linear relationship between T1 relaxation rate (1/T1) and Gd concentration for GZCIS/ZnS with different Gd/Cu ratios and Magnevist. (b), Fluorescence (top) and T1-weighted MR images of GZCIS/ZnS QDs and Magnevist at various Gd contrations. Here GZCIS/ZnS QDs were prepared with Gd/Cu and Zn/Cu ratio fixed at 4 and 2, respectively. The QDs present fluorescence emission at 580 nm.
