肺癌是危害人类生命主要恶性肿瘤之一,肺内小病灶在动态随访中,肺癌发病率较高,部分病例常因不能定性而失去最佳治疗时机。目前肺内小病灶最后定性诊断在国内外医学影像中仍有一定难度;况且肺内小病灶的定性诊断中有相当一部分为早期肺癌,所以肺内小病灶的定性诊断尤为重要。由于CT的应用和发展, Lung cancer is one of the major malignancies that endanger human life. In the dynamic follow-up of small lesions in the lung, the incidence of lung cancer is high, and in some cases, the optimal timing of treatment is often lost due to non-characteristic. At present, the final qualitative diagnosis of small lesions in the lung is still difficult in domestic and international medical imaging. Moreover, a considerable part of the qualitative diagnosis of small lesions in the lung is early stage lung cancer, so the qualitative diagnosis of small lesions in the lung is particularly important. Due to the application and development of CT,