Objective To establish an automated labeling method of 18F-AlF-1,4,7-triazocyclohex-ane-1,4,7-triacetic acid-D-Phel-Tyr3-Thr8-octreotide(NOTATATE)and perform neuroendocrine tumor(NET)imaging.Methods Based on the GE-FASTLab2 synthesis module,18F-AlF-NOTATATE was auto-matically prepared by one-step chelation labeling with aluminum fluoride,and its labeling conditions were optimized.The product quality was analyzed.One patient(male,47 years old)with lower rectal segment NET and one patient(female,52 years old)with pancreatic NET underwent 18F-AlF-NOTATATE PET/CT imaging.Results 18F-AlF-NOTATATE was successfully prepared with a total synthesis time of 35 min.The optimized radiochemical yield was(23.8±3.1)％(without decay correction,n=3),the radioactivity was(4.63±0.68)GBq,and the radiochemical purity was＞95％.The stability was good,and the product quality met the requirements.18F-AlF-NOTATATE showed clear imaging in the patient with rectal segment NET,with SUVmax of 13.3 and tumor/liver ratio of 3.3.Metastatic lesions in the liver,lymph nodes,and ribs showed high SUVmax and tumor/liver ratios.The imaging of the pancreatic NET patient showed an abnormal increase in local radioactive uptake at the uncinate process of the pancreatic head,with SUVmax of 5.6 and SUVmax of 6.3 and the tumor/liver ratio of 2.3 after 2-hours imaging.Conclusions Using the GE-FASTLab2 synthesis module,18F-AlF-NOTATATE can be prepared with high activity.The preparation is simple,the method is stable,and the product has high radiochemical purity.18F-AlF-NOTATATE exhibits good imaging performance in NET patients,providing valuable information for diagnosis,treatment,and prognosis evaluation.
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