目的评价小剂量团注结合肺动 脉主干区域测定方法对肺动脉CTA的应用 价值。方法 回顾性选取2017年7月至2018 年5月在Phillip128排iCT上检查的肺动脉 CT病人32例，采用小剂量团注结合在肺动 脉主干的椭圆区域测定方法，以对比剂峰 值时间加1秒为肺动脉CTA的图像采集延迟 时间。由三位副高职称以上的医师对重建 的图像按优、良、差进行主观评价。结 果 通过对肺动脉CTA轴位图像及三维工作 站后处理MIP、VR、MPR的评判，检查的32 例中，26例为优，6例为良。结论 小剂量 团注椭圆区域检测对比剂峰值的方法，是 肺动脉CTA检查扫描延迟时间设定的一种 有效方法，能够为临床提供满意的影像图 像。

Objective To evaluate the application value of test bolus injection combined with pulmonary artery trunk area measurement method in pulmonary artery CTA. Methods 32 pulmonary artery CT patients examined on Phillips 128 - row ICT from July 2017 to may 2018 were retrospectively selected. the method of small dose bolus injection combined with ellipsometry in the main pulmonary artery was used. the peak time of contrast agent plus 1 second was used as the delay time of image acquisition of pulmonary artery CTA. The reconstructed images were evaluated subjectively by three doctors above the title of associate high school. Results Based on the evaluation of the axial images of pulmonary artery CTA and MIP, VR and MPR post-processing of the three-dimensional workstation, among the 32 cases examined, 26 cases were excellent and 6 cases were good, which satisfied the clinical diagnosis. Conclusion The method of detecting the peak value of contrast medium in test bolus ellipse region is an effective method for setting the scanning delay time of pulmonary CTA examination, which can provide satisfactory image for clinic.