Figure 4: Standardized uptake value (SUV) of 18F-FDG, 18F-FAMT, and 11C-choline in malignant and benign lesions. 18F-FDG, 18F-FAMT, and 11C-choline revealed significant higher SUV in malignant lesions than in benign lesions ( , , and , resp.). Differences of tumor SUVs between 18F-FDG and 11C-choline were not significant in both malignant and benign lesions, whereas both 18F-FDG and 11C-choline SUVs were significantly higher than that of 18F-FAMT.