Positron emission tomography is a new generation image test equipment , which works through functional metaboly of tissue to help doctors to make a diagnosis . pet is of great importance to early diagnosis of tumors and the test of pathological changes of organs Pet全称为正电子发射断层扫描成像系统，是通过组织的功能代谢来诊断疾病的新一代影像检查设备，对于肿瘤的早期诊断及各器官病变的检查均有重要意义。
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