The most commonly used PET radiotracer is fluorodeoxyglucose (FDG), a radiolabeled form of glucose, which is consumed more aidly by tumors than by normal tissue.

• 最常用的PET放射示踪迹为氟脱氧葡萄糖（FDG），葡萄糖的放射示踪形式，在肿瘤组织中较正常组织消耗更快。