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Objective To clarify the usefulness of 18F-FDG PET-CT for detecting primary gastric cancer by gastric distention with mixture of milk and Meglumini Diatrizoate.Methods Sixty-eight patients (47 males,21 females,age: 41 to 87 years) suspected of gastric carcinoma underwent 18F-FDG PET-CT imaging in 13 multicenter studies’ hospitals.After whole-body PET-CT imaging of fasting state,patients drank proper content mixture of milk with Meglumini Diatrizoate.