正电子发射断层显像对肺癌诊断和分期的价值

目的 评价^18F脱氧葡萄糖（^18FDG）正电子发射断层（PET）显像对肺内占位病变诊断和肺癌分期的价值。方法 147例内病变患者,其中肺癌93例、肺转移癌15例、良性病变39例,共进行163次PDG PET显像。其中68例恶性和30例良性病例与相应的CT进行比较。结果 FDG PET对147例肺内占位病变良恶性鉴别的灵敏度为97.2%,特异性为89.7%,准确性为94.6%。93例肺癌患者中58例（62.4%）通过PET检查发现更多病灶,改变分期36例（38.7%）。98例PET显像与CT比较发现：两者符合仅39例（39.8%）;PET发现病灶而CT未发现者29例（29.6％）;CT发现病灶而PET代谢活性不高,通过随访诊断为良性病变30例（30.6%）。但CT在显示解剖结构方面明显优于PET。结论 FDG PET显像通过显示病变部位的葡萄糖代谢活性而对肺癌的诊断和分期有较大的价值,与CT精细的形态解剖结构结合可为临床诊断提供更多的信息。

Evaluation of positron emission tomography in diagnosing and staging of lung cancer

OBJECTIVE: To evaluate positron emission tomography (PET) in diagnosing and staging of lung cancer. METHODS: One hundred and forty-seven patients (93 with lung cancer, 15 with lung metastatic tumors, 39 with benign lesions) were involved in the study. 163 whole body examinations (twice in 12 cases and 3 times in 2 cases) were performed after injection of 18F-fluro-deoxy-glucose (18FDG) with a Siemens ECAT EXACT HR + PET system. The results of PET were compared with pathological diagnoses (112 cases), clinical follow-up (35 cases), CT (68 malignant and 30 benign cases), and other imaging diagnoses. RESULTS: For the 147 cases with lung lesions, the sensitivity, specificity, and accuracy of FDG PET in differentiating the malignant from the benign were 97.2%, 89.7%, and 94.6% respectively. For the 93 lung cancer cases, more lesions were detected by PET in 58 (62.4%) cases, and changed staging in 36 (38.7%). In the 98 cases examinations, PET positive findings were consistent with CT in 39 (39.8%) cases; PET detected more lesions than CT in 29 (29.6%) cases; the lesions detected by CT were negative or with low uptake in the PET images in 30 (30.6%) cases, and they were finally proved as benign by follow-up. However, CT provided better detailed anatomical structures of the lesions than PET, and image fusion should give more information about the lesions. CONCLUSIONS: FDG PET had advantages in diagnosing and staging of lung cancer by providing metabolic information of the lesions. Comparison and fusion of PET with CT will give much help to clinical diagnosis.