回顾性心电门控-支气管动脉CT成像前瞻性研究  

Retrospective ECG-Gated CT Imaging of Bronchial Artery:A Prospective Study

作　　者：张万军[1] 龚建平[1] 张伟[1] 周金亮[1] 钱铭辉[1] 

机构地区：[1]苏州大学附属第二医院放射科,215004

出　　处：《临床放射学杂志》2015年第4期643-647,共5页Journal of Clinical Radiology

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。Objective To use retrospective ECG-gated technique and conventional spiral CT scanning technique to perform bronchial artery （BA） CT angiography （CTA）, and to discuss the difference in displaying BA between the two techniques. Methods A total of 120 patients who underwent pulmonary arterial enhancement scanning （PAES） were randomly and equally divided into three groups with 40 patients in each group. Retrospective ECG-gated CTA of BA was performed in group A and routine spiral CT scanning was employed in group B and group C with the gantry rotation speed of 0. 4s/r and 0.5s/r respectively. Volume rendering （ VR）, maximum intensity projection （MIP） and multi-planar reconstruction （MPR） techniques were sued to display the mediastinal segment and pulmonary lobar segment of bronchial arteries. The images were analyzed. Results （ 1 ） The visualization rates of mediastinal segment and pulmonary lobar segment of BA in group A were 100% and 62% respectively, which were higher than those in group B and group C. The BA image quality of ＂excellent＂ was obtained in 66 （66/95） cases, which was higher than that in group B and group C. The average effective dose （ED） of PAES in group A was 15.6mSv, which was higher than that in group B and group C. （2） The visualization rates of the mediastinal segment and pulmonary lobar segment of BA in group B were 89% and 33% respectively, which were higher than those in group C. The ＂excellent＂ BA quality in group B was seen in 30 （30/84） cases, which was higher than that in group C （n = 11, 11/63）. The average scanning time was 3.2s in group B, which was only 36% of the scanning time in group A （9.0s）. Conclusion Retrospective ECG-gated CT angiography can improve the image quality of BA, although it has higher ED. The use of 64-slice spiral CT with 0.4s/r spiral scanning can obtain satisfactory visualization rate of BA with good image quality, and can effectively reduce the ED and scanning time as well. This technique is suitable

关 键 词：体层摄影术 X线计算机 支气管动脉 血管造影 心电门控 

分 类 号：R816.2[医药卫生—放射医学]