Planar images of the distribution of 186Re-Doxil (740 MBq/kg) (upper panel) and 186Re-PEG-liposomes (1480 Mbq/kg) (lower panel) acquired at various time points postinjection. Accumulation of radioactivity in tumor, liver, spleen, and kidney is seen. 186Re-Doxil had higher tumor accumulation in comparison to 186Re-PEG-liposomes at each time point. ST, standard; T, tumor; H, heart; L, liver; S, spleen; K, kidney. Color images available online at www.liebertonline.com/cbr