The aim of this study is to establish and optimize the target-specific PET/CT imaging method, and its physiological and pathological distribution characteristics, on the basis of which the diagnostic efficacy of the above imaging agents in digestive system malignant tumors will be evaluated.
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Biodistribution
Timeframe: 1 day from injection of the tracers
Standardized uptake value (SUV)
Timeframe: 1 day from injection of the tracers
Radiation dosimetry
Timeframe: 1 day from injection of the tracers
Diagnostic value in patients with digestive system malignancy
Timeframe: 30 days
The correlation between the expression of specific target and tracer uptake value
Timeframe: 60 days