肺癌在许多国家是首位的癌症致死原因[1 ] ,因此其准确的术前分期对病人选择手术或内科治疗甚为关键。目前CT最常用于肺癌的术前分期 ,但CT仅能依据淋巴结的大小来判断 ,手术发现准确率较低[2 4 ] ,对远处转移的判断其假阳性率亦较高[3,4 ] 。即CT仅能提供优良的解剖学信息 ,? Lung cancer is the leading cause of cancer death in many countries [1], so its accurate preoperative staging is critical for patient selection of surgery or medical treatment. Currently, CT is most commonly used for the preoperative staging of lung cancer, but CT can only be judged by the size of the lymph node and has a low accuracy of surgical findings [24]. The false positive rate of distant metastasis is also high [3,4 ]. CT can only provide good anatomical information ,?