16层螺旋CT对中央型肺癌支气管动脉成像技术的探讨

目的：探讨16层螺旋CT中央型肺癌支气管动脉血管成像技术。方法：对本院57例中央型肺癌（直径3-5cm）患者行16层MSCT胸部CT血管造影检查，其中实验组29例，采用对比剂示踪触发扫描技术（SureStart）；对照组28例，采用经验时间法，扫描延时为（25＋2）s。采集层厚1mm，螺距15，扫描速度0．5s／r。非离子型对比剂（300mgl／mL），注射剂量1．5mL／kg，注射速率4～5mL／s。支气管动脉三维重建后处理技术采用遮盖容积重建、多平面重建和曲面重建、最大密度投影重建。结果：实验组29例共显示支气管动脉93条，平均为3.21条／例；对照组28例共显示支气管动脉31条，平均为1．11条／例。经统计学分析，实验组与对照组的支气管动脉显示成功率及平均显示数目有显著差异（P〈0．05）。结论：16层MSCTA扫描是一种安全无损害，简便有效的支气管动脉显示方法；利用SureStart技术能更好地显示支气管动脉血管图像。

16-Slice MSCT Angiography of Bronchial Artery in Central Type Lung Cancer

Objective： To investigate the value of 16-slice MSCT angiography of bronchial artery in central type lung cancer. Methods： Fifty-seven patients with central type lung cancer （3-5 cm in diameter） underwent 16-slice MSCT angiography per Surestart technique （experimental group, n= 29） or using empirical timing with a delay time of （25±2） s （control group, n=28）. The setting of spiral CT was 1 mm in thickness, 15 in pitch, and 0.5 s/r by scanning speed. CTA was performed using 300 mgl/mL nonionized contrast medium, delivered at a dose of 1.5 mL/kg and at a rate of 4-5 mL/s. Post processing technique such as shaded volume reconstruction, multiplanar reconstruction, cured planar reconstrution and maximum intensity projection were used to generate the 3D imaging of bronchial artery. Results ： Ninety-three bronchial arteries were visualized of the 29 cases in the experimental group （mean： 3.21 arteries per case） versus 31 of the 28 cases in the control group （mean： 1.11 arteries per case）. The rate of successful visualization and number of visualized arteries were found to be significantly different between the two groups （P〈0.05）. Conclusion： 16-slice CTA was demonstrated to be a safe and effective method for display of bronchial arteries. In contrast to empirical timing, SureStart technique appeared to provide clearer imaging of bronchial artery.