Fig. 3

 A, B In vitro CT images and corresponding linear correlations of the CT signals with the concentrations of Bi:Cu₂O@HA NP and Iohexol. C In vitro CT images (inset) and corresponding plots of the CT signals vs. concentration for CT26 cells in the Bi:Cu₂O@HA and block groups. D, E In vivo CT images and corresponding CT values at the tumor sites of tumor-bearing mice after injection in the Bi:Cu₂O@HA and block groups. Data are presented as means ± SDs (n = 3). *p < 0.1, **p < 0.01, ***p < 0.001