Fig. 2
More liver lesions were detected by 18F-OC (d–f) than by 68Ga-DOTATATE (a–c). Maximum intensity projection image (a, f) shows more liver metastases present in a 50-year-old patient with a grade II primary pancreatic neuroendocrine tumor. Although transaxial fused PET/CT (b, d) and PET images (c, e) acquired with 68Ga-DOTATATE and 18F-OC show an equal number of liver lesions in this slice, the lower background level of 18F-OC uptake by normal liver (d–f) better delineates liver lesions by making the lesions appear to have more obvious uptake and sharper edges relative to background levels of 68Ga-DOTATATE uptake (a–c)