颈部MSCTA:8层螺旋CT扫描与重建方法探讨

Application of multi-slice CT on cervical CT angiography: to discuss the scan techniques and image reconstructions

目的:探讨多层螺旋CT颈部CTA扫描技术条件、图像重建方法,评价CTA对颈部血管狭窄性病变的诊断价值。方法:8层螺旋CT颈部CTA检查22例,其中14例做了颈部DSA检查,CTA检查后在工作站经最大密度投影（MIP）容积再现（VR）及高级血管分析（AVA）重建血管,分析不同重建方法对颈部血管显示的能力。结果:CTA显示正常血管43支,狭窄血管45支,其中14例与DSA对照,经统计学分析二者对颈部血管狭窄的显示差异无显著性意义,AVA软件能清晰显示血管狭窄及椎动脉和周围骨质的关系,准确显示狭窄段,自动计算狭窄程度。结论:多层螺旋CT的颈部CTA检查可做为颈部动脉狭窄性病变筛选的首选检查方法,AVA软件使CTA对迂曲、与骨质关系密切的血管狭窄的分析更准确。

Objective:To discuss the technique procedures of multi-slice CT angiography and reconstruction methods. To characterize its usefulness in the evaluation of stenosis of the cervical arteries. Methods:22 patients underwent multislice CT angiography from which 14 patients were examined by DSA,The data of CTA were reconstructed with maximum intensity projection (MIP), volume rendering (VR) and advanced vessel analysis (AVA), The difference of the images with different reconstruction methods were compared. Results:43 normal vessels and 45 stenosis vessels were demonstrated with CTA. The images of 14 patients were compared with DSA. No differences were found on displaying the stenosis vessels by two methods. Reformatted by AVA soft ware, the stenosis of the vessels could be shown clearly, the relation between the stenosis of vertabral arteries and the bony structures could be well depicted, the degree of the stenosis could be calculated accurately by AVA. Conclusion: Multislice CT angiography can provide useful information on cervical vessel diseases. The AVA software allows better demonstration of the cervical vessels which are tortuous and surrounded by complex bony structures.