Figure 2. (.
A) Region of interest (ROI) analysis of PET images obtained at 1 and 4 h post injection, expressed in percent injected dose per cubic centimeter (% ID/cc). (B) Biodistribution analysis obtained at 4 h post injection, expressed in percent injected dose per gram (% ID/g). These data indicate that ROI analysis provides reliably quantitative information on distribution in organs of interest.