- Unlike fludeoxyglucose F18(18F)FDG, a routinely used PET radiopharmaceutical which is excreted by the urinary system and accumulates in the bladder, limiting its utility in pelvic imaging, (11C)AC has low physiologic distribution in the pelvis. Several studies involving small numbers of patients have demonstrated that (11C)AC PET imaging can localize in pelvic nodes involved with prostate cancer (PC).