Fig. 3

In vivo MR contrast properties of FeCO₃ NPs. A in vivo (n = 3) T2-weighted MR images of lung tumors pre and post-1 h, 3 h, 5 h injection of PBS and FeCO₃ NPs (dose of NPs; 10 mg Fe ion/kg, i.v injection, MRI scans were performed on a 9.4 T MRI scanner, circle/pseudo color indicates the tumor region). B Kinetic plot of in vivo contrast ability of PBS and FeCO₃ NPs, data is represented as mean ± SD; ***P ≤ 0. 001. C Schematic representation of in vivo MR imaging of lung tumors using FeCO₃ NPs on a 9.4 T MRI scanner