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为检测呼吸门控的准确性、了解定量的ＣＴ资料与肺通气功能的相关性，对患者组４０例和对照组２０例行临床肺通气功能检查、ＰｕｌｍｏＣＴ肺活量（ＶＣ）检测和呼吸门控下螺旋ＣＴ扫描。应用评估软件测定肺区平均ＣＴ值及像素指数（ＰＩ）。分析它们在各组间的差异及与肺通气功能的相关性。结果显示：ＰｕｌｍｏＣＴ检测的ＶＣ和临床测定的ＶＣ无显著性差异（Ｐ＞０．０５）；各病变组平均ＣＴ值与对照组有显著性差异（Ｐ＜０．０１）；ＰＩ也有特征性改变且与肺通气功能相关。螺旋ＣＴ结合呼吸门控和自动化评估软件测定肺密度是一项精确、重复性好的方法
To detect the accuracy of respiratory gating and to understand the correlation between quantitative CT data and pulmonary ventilation, 40 patients in the patient group and 20 patients in the control group underwent clinical pulmonary function tests, PulmoCT vital capacity (VC) and respiratory gating Spiral CT scan. The lung area was evaluated for mean CT value and pixel index (PI) using evaluation software. Analyze their differences among groups and their correlation with pulmonary ventilation. The results showed that there was no significant difference between the VC detected by PulmoCT and the VC measured clinically (P> 0.05). The average CT value of each lesion group was significantly different from that of the control group (P <0.01) And pulmonary ventilation related. Spiral CT combined with respiratory gating and automated evaluation software to determine lung density is an accurate and reproducible method