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PET应用18F氟脱氧葡萄糖（FDG）作为示踪剂可以直接评估细胞葡萄糖代谢。大多数肿瘤细胞的葡萄糖运转蛋白值增高以及促进糖酵解的细胞内酶也见增多，因之葡萄糖代谢增快。在大多数恶性细胞，葡萄糖-6-磷酸酯酶值降低以致细胞内FDG累积，PET可显示FDG摄入比正常细胞为多。根据这
PET can use 18F fluorodeoxyglucose (FDG) as a tracer to directly assess cellular glucose metabolism. The increase in the glucose transport protein value of most tumor cells and the increase in intracellular enzymes that promote glycolysis have also been attributed to an increase in glucose metabolism. In most malignant cells, the glucose-6-phosphatase value is reduced so that intracellular FDG accumulates, and PET can show more FDG uptake than normal cells. According to this