Fig. 1
A mouse phantom without the lid after it was filled with 212Pb is shown in panel (A). The high-activity concentration solution (363 kBq/ml) was coloured blue (kidneys appear green) and the low-activity concentration solution (46 kBq/ml) was coloured yellow. Panel (B) shows maximum intensity projection SPECT/CT images of the mouse phantom in the anterior view acquired with the clinical SPECT/CT. The top row shows the 30 × 4 reconstruction, and the bottom row shows the 30 × 30 reconstruction. The activity concentrations in the high activity regions were 303 kBq/ml, 291 kBq/ml, 256 kBq/ml, and 246 kBq/ml for ME 79 keV, ME 239 keV, HE 79 keV, and HE 239 keV, respectively