Figure 4

Transaxial sections of the ACCT (left) and PET/CT (right) (0 to 30 min). The image shows the VOI drawn in the urinary bladder (upper row). Lower row shows the transaxial section of the PET image acquired from 0 to 2 min (left) and from 25 to 30 min (right) along with the VOI imposed in the urinary bladder. During this time period, the bladder activity representing ¹⁵O has almost completely declined while the surrounding soft tissue activity, mainly representing ¹¹C, is still clearly visible.