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目的：ＣＴ测量国人肺动脉直径。材料和方法：对１００例成人胸部行双螺旋ＣＴ扫描，在六个位置测量肺动脉直径。结果：主肺动脉直径，男２５．２±２．５ｍｍ，女２３．９±２．４ｍｍ；右肺动脉近端直径，男２０．９±２．５ｍｍ，女１９．５±２．１ｍｍ；右肺动脉远端直径，男１６．５±２．２ｍｍ，女１５．５±２．４ｍｍ；左肺动脉直径，男１９．１±２．９ｍｍ，女１８．０±２．５ｍｍ；右下肺动脉直径，男１１．２±１．７ｍｍ，女１１．１±１．５ｍｍ；左下肺动脉直径，男女均为１０．７±１．３ｍｍ。结论：ＣＴ可以测量肺动脉直径，中心肺动脉直径男女有显著差异（Ｐ＜０．０５），双下肺动脉直径男女无显著差异（Ｐ＞０．０５）。
Objective: CT measurement of pulmonary diameter. MATERIALS AND METHODS: A double helical CT scan of 100 adult patients was performed and the diameter of the pulmonary artery was measured at six locations. Results: The diameter of the main pulmonary artery, male 25.2 ± 2.5mm, female 23.9 ± 2.4mm; proximal pulmonary artery diameter, male 20.9 ± 2.5mm, female 19.5 ± 2.1mm; right pulmonary artery Distal diameter, male 16.5 ± 2.2mm, female 15.5 ± 2.4mm; left pulmonary artery diameter, male 19.1 ± 2.9mm, female 18.0 ± 2.5mm; right lower pulmonary artery diameter, male 11.2 ± 1.7mm, female 11.1 ± 1.5mm; left lower pulmonary artery diameter, both men and women were 10.7 ± 1.3mm. CONCLUSION: CT can measure diameter of pulmonary artery and diameter of central pulmonary artery. There is significant difference between men and women (P <0.05). There is no significant difference between male and female diameter of double lower pulmonary artery (P> 0.05).