FDG-PET/CT对于T1期肺癌N期与M期病灶诊断优于普通CT,但受CT衰减校正(CT attenuation-correc-ted,CTAC)数据采集与重建模式影响与早期肺癌糖代谢低的特点,T1期(直径≤3 cm,实性、部分实性、非实性)原发灶检出与定性比较困难。肺部低剂量CT(low dose CT,LDCT)可以弥补前者缺点。通过改进数据采集重建模式,使CTAC图像质量达到LDCT质量要求或对高危患者追加肺部LDCT,制定合理随访计划,配合肿瘤标志物检查,发挥功能影像和解剖影像相结合,无创与微创方法相结合的优势,使其对T1期肺癌诊断的定位、定性、定量、定期与预后判断更准确。 FDG-PET / CT is superior to ordinary CT in the diagnosis of stage N lung cancer and stage M lung cancer, but CT attenuation-related (CTAC) data acquisition and reconstruction model is associated with low glucose metabolism in early lung cancer , T1 stage (diameter ≤ 3 cm, solid, part of the real, non-solid) detection and characterization of the primary more difficult. Low-dose CT (low dose CT, LDCT) can make up for the former shortcomings. By improving the data collection and reconstruction model, CTCT image quality can meet the quality requirements of LDCT or lung LDCT in high-risk patients, develop a reasonable follow-up plan, cooperate with tumor marker examination, combine functional imaging with anatomical imaging, noninvasive and minimally invasive methods Combined with the advantages of its diagnosis of T1 lung cancer location, qualitative, quantitative, regular and prognostic judgment more accurately.