目的：探讨左肺上叶肺段在CT图像上的划分。方法：利用Volume Wizard图像后处理工作站对160例成年男性肺部多层螺旋CT图像进行重建，分析左肺上叶肺段及亚段静脉的属支数目类型、配布特点，并依此探寻左肺上叶肺段在CT图像上的划分方法。结果：1.V1+2存在率约为71.2%，V2+3出现率约为28.8%；V4 和V5共干形成V4+5，占61.2%，38.8%的V4与V5单独汇入左肺上静脉。2.V1+2干、V1、V2外支、低位V2支、V2上支及V2尖支都可成为前段与尖后段的段间支；V3下部前支、中支、后支、前内支和前外支为上舌段与前段的段间支；V3尖支为前段与尖后段的段间支；V4和V4+5干为上、下舌段的段间支。结论：利用MSCT后处理技术，能够有效辨识肺段静脉及其属支的配布情况，该技术可为肺段的划分提供帮助。

         Objective: To investigate the division method of pulmonary segments in superior lobe of the left lung in CT images. Methods: The MSCT images of 160 healthy males were reconstructed in a Volume Wizard Work Station. To investigate the division method of the superior lobe of the left lung, the branch numbers, the confluens types, and the distribution regularity of the pulmonary segmental and subsegmental veins were analyzed in CT images. Results: 1.The approximate occurrence rate of V1+2 was 71.2%, and V2+3 28.8%; V4 and V5 joining together into trunk (V4+5) was 61.2%, and the rate of them joining into left lung separately was 38.8%. 2.Trunk of V1+2, V1, external branch of V2, low-set V2, superior branch of V2, or apical branch of V2 can be the intersectional branches of anterior and apicoposterior segments. Inferior part of anterior branch, middle part, posterior part, anterointernal part, anteroleteral part of V3 can be the intersectional branches of superior lingular, and anterior segments. Apical branch of V3 was the intersectional branch of anterior and apicoposterior segments. V4 and trunk of V5 were the intersectional branches of superior and inferior lingular segments. Conclusions: Pulmonary segmental veins and their branches can be recognized well via the MSCT image postprocessing technique, which is helpful for the division method of pulmonary segments.