回顾性心电门控-支气管动脉CT成像前瞻性研究

发布时间：2018-03-16 08:27

本文选题：体层摄影术　切入点：X线计算机　出处：《临床放射学杂志》2015年04期 　论文类型：期刊论文

【摘要】：目的分别应用回顾性心电门控和常规螺旋CT扫描技术对支气管动脉(BA)进行CT成像,并探讨BA显示的差异。方法将120例在本院行胸部肺动脉期增强CT的患者随机分为三组,每组40例,A组应用回顾性心电门控技术,B组和C组采用64排螺旋CT扫描技术,扫描速度分别为0.4 s/r和0.5 s/r,对BA的纵隔段及叶段采用容积再现(VR)、最大密度投影(MIP)、多平面重组(MPR)等后处理技术进行显示,并评价图像质量。结果(1)A组纵隔段和叶段BA的显示率分别为100%和62%,高于B组和C组;A组图像质量评级为"优良"的血管为66个(66/95),高于B组和C组。A组肺动脉期扫描的平均有效剂量为15.6 m Sv,高于B组和C组。(2)B组纵隔段和叶段BA的显示率分别为89%和33%,高于C组。B组图像质量评级为"优良"的血管30个(30/84),高于C组的11个(11/63)。B组的平均扫描时间为3.2 s,仅为A组(9 s)的36%。结论回顾性心电门控-BA-CTA可提高BA的成像质量,但有效剂量(ED)偏大。使用0.4 s/r的64排螺旋CT扫描,BA的显示率和图像质量居中,有降低有效剂量和缩短扫描时间的优点,适用于咯血等急诊患者BA的CTA检查。
[Abstract]:Objective to study the difference of BA display in bronchial artery by retrospective gated ECG and conventional spiral CT scanning. Methods 120 patients who underwent chest and pulmonary arterial phase enhanced CT in our hospital were randomly divided into three groups. Retrospective ECG gating technique was used in each group of 40 cases. Group B and group C were examined with 64-slice spiral CT. The scanning velocities were 0.4 s / r and 0.5 s / r, respectively. The mediastinal segment and leaf segment of BA were displayed by volume reconstruction, maximum density projection and MPRs, etc. Results the display rates of BA in mediastinal segment and lobar segment in group A were 100% and 622, respectively, which were higher than those in group B and group C with a "good" image quality rating of 66 vessels 66 / 95, and higher than that in group B and group C. The average effective dose was 15.6 m, which was higher than that in group B and group C (BA) in mediastinal segment and lobes (89% and 33, respectively), higher than that in group C (30 30 / 84) with a good image quality rating, and higher than that in group C (11 / 11 / 63.B). Conclusion retrospective ECG gated BA-CTA can improve the imaging quality of BA. The display rate and image quality of 64 slice spiral CT scanning BA with 0.4 s / r were in the middle, which had the advantages of reducing the effective dose and shortening the scanning time. It was suitable for the CTA examination of BA in patients with hemoptysis and other emergency patients.
【作者单位】：苏州大学附属第二医院放射科;
【分类号】：R816.2

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