A) Representative CT, PET/CT fusion, and PET image slices of mice administered with 64Cu-liposome 24 h post-administration. Arrows indicate the bone marrow in PET images. B) Magnified image showing the CT, PET/CT fusion, and PET image slice of tibia (marrow-rich) of the same mice for clarity; and C) volume-rendered images showing CT, PET/CT fusion, and PET images of tibia demonstrate that accumulation of liposomes is specific to bone marrow.