摘要
目的:比较16层螺旋CT图像后处理中不同层厚的MIP重组图像对于肺动脉栓子的检出率。方法:对于32例临床拟诊为肺动脉栓塞的患者,采用层厚5mm的胸部增强扫描,利用原始数据分别行0.75mm组,2.mm组,5mm组,10mm组MIP重建。显示清楚的叶、段、亚段肺动脉内有无栓子,并行χ2检验。结果:CT诊断肺动脉栓塞23例,病变共累及肺动脉72支,对于肺动脉主干及各叶肺动脉栓塞,前4组图像检出率分别为100%、100%、95.2%、90.5%。对于肺段及亚段肺动脉栓塞的检出,0.75mm组及2.mm组(检出率分别为96.1%、90.2%)明显高于5mm组,10mm组(检出率分别为82.9%、60.8%),0.75mm组及2.0mm组在统计学上没有显著差异(P值为0.433)。2.mm组与5.0mm组、10mm组在统计学上有显著差异。(P值分别为0.004,0.001)。结论:多层螺旋CT,2mm层厚MIP重建图像能明显提高段、亚段肺动脉栓子的显示率,又能减少图像数目,有重要的诊断价值,5.0mm组1、0mm层厚MIP重建图像定位准确,直观明了,为重要的补充,MIP后处理技术为检出肺动脉栓子的最佳技术。
Objective：The purple of this study was to determine the optimal thickness for condensing transaxial images into maximum intensity projection （MIP） images in the evaluation of small pulmonary arteries using 16-slice multidetector-row eomputed tomography （MDCT）. Methods：Helical computed tomography （CT） scans were obtained from hmg apices to bases using 16-slice MDCT of 5 mm thickness in 32 patients suspected of having a pulmonary embolism. Four kinds of reconstructed images using the MIP technique with thicknesses of 1 mm, 2 mm, 5 mm, and 10 mm were obtained from each patient and forward to monitors of a picture arehiving and com- munication system for analysis by 2 independent observers. The observers recorded the name of the segmental and subsegmental arteries that were traceable in each image series. X^2 tests were performed. Results：23 cases pulmonary embolism were diagnosed. PE were diagnosed in 23 of 32 patients, and 72 branches were detected. The percentage of emboli in main pulmonary arteries and lobar arteries was respectively 100%, 100%, 95%, 90% in both the 0.75 mm thick and 2 mm thick MIP images, a higher percentage of subsegmental arteries was traceable （96.1% and 90.2%） than in the 5 mm and 10 mm thick MIP images （82.9% and 60.8%, respectively）. No statistically significant difference was observed between the 1 mm thick and 2 nun thick MIP images in tiffs respect （ P = 0.433）, image quality of 2 mm thick MIP images was superior to that of the 5 mm and 10 mm thick M/P images （ P = 0. 004,0.001, respectively）. Conclusion：2 mm thick MIP images using MDCT are found to provide satisfactory images, which are comparable to 0.75 mm thick im- ages for the analysis of subsegmental pulmonary arteries in patients suspected of pulmonary embolism. The 5 nun and 10 mm thick MIP images were important supplements, MIP post-processing for the detection of PE is the best technology.
出处
《医学影像学杂志》
2009年第2期219-222,共4页
Journal of Medical Imaging
关键词
肺栓塞
肺动脉造影
体层摄影术
X线计算机
Pulmonary emdolism
Tomography, X-ray computed
Ptdmonary angiography
