多排螺旋CT对肺动脉及其分支的显示研究

目的探讨多排螺旋CT(MDCT)薄层扫描对肺动脉及其分支的显示能力。方法前瞻性研究30例正常人。CT设备使用GELightspeedQX/iUltra。扫描层厚1.25mm,重建间距0.65mm,扫描速度0.5s/圈,螺距0.875,床速8.75mm/圈。造影剂含碘浓度300mgI/ml,注射速度3.5ml/s,总量80ml,延迟18s后扫描。结果1.25mm薄层重建,肺动脉三、四级、五级及六级分支显示率分别为100%、100%、75%及35%。结论多层螺旋CT薄层扫描可以较好地显示第三～五级肺动脉。

The evaluation of pulmonary arteries using MDCT

Objective To evaluate the imaging of pulmonary arteries using MDCT. Methods Prospectively 30 normal persons were scanned by a eight row MDCT. The scan parameters included the pitch of 0.875, scan time of 0.5s per circle, table speed at 8.75mms and the detector collimation of 1.25mm. The contrast medium (300mg Iml), at a dosage of 80 ml, was injected by power injector at the rate of 3.5mls. Axial scans were performed in 18 second when the injection was triggered. Results The segmental branches, sub-segmental branches, branches of fifth and sixth level of the pulmonary artery system were demonstrated at a rate of 100%, 100%, 75%and 35%respectively. Conclusion With the same parameters, the visualization of segmental and sub-segmental branches of pulmonary artery system is better in eight rows MDCT than that in four row MDCT.