多层螺旋CT肺血管造影在肺动脉栓塞中的应用

目的：探讨多层螺旋CT肺血管造影在肺动脉栓塞诊断中的应用。方法：使用6层螺旋CT对39位肺动脉栓塞患者进行血管成像检查。应用准直1．0mm，螺距1．25进行扫描，将得到的原始数据行层厚1．25mm、3．0mm轴面重建，MIP2mm、5mm多视角多平面重组及MRP重组。分析不同后处理技术的检出栓塞动脉支数进行比较。结果：39例肺动脉栓塞患者，共累及肺动脉血管326支，以上5种重建方法对肺动脉主干及叶动脉的栓塞，显示检出结果一致。对段及亚段动脉的栓塞MPR优于其它后处理方法（P〈0．05）。结论：多层螺旋CT血管造影是肺栓塞安全、敏感性且特异性高的无创性诊断方法，其图像后处理技术更为直观、全面的显示栓子的形态、部位、范围。

The appliacation of multiple-slice spiral CT angiography in pulmonary arterial embolization

Objective：To investigate the diagnositic value of multiple-slice spiral CT angiography in pulmonary arterial embolization. Methods：Thirty-nine patients with pulmonary embolizaion were included in this study. CT pulmonary angiography （CTPA） was performed with six-row helix CT （collimation = 1.0 mm and pitch = 1.25）. The raw data were reconstructed with 1.25 mm and 3.0 mm slice thickness, respectively. MIP of 2 nun and 5 mm and MPR were used to observe the embolization. The results of different post-processing technologes were comapred with each other. Results： There were 326 lung arterial vessels found in 39 paitents. No difference was found between the numbers of invoved pulmonary artery tnmk and lobar artery in different post-processing techniques. With respect to segmental pulmonary artery and subsegmental artery, MRP was better than the other post-processing method （ P 〈 0.05）. Conclusion： Multilayer helix CT angiography for the pulmonary embolism is safe and non-invasive modality with high sensibility and specifity. Image post-processing technology, especially MPR, is reliable in displaying the form, location and range of an embolus.