摘要
目的：探讨CT椎动脉造影和曲面重建的可行性及临床价值.方法：选取50例患者,采用阈值触发扫描技术行SCTA检查,将原始图像分别采用VR、MIP重建法合成血管影像,同时行MPR、以VR图像为基础行CPR重建.由两位经验丰富的影像科医生采用双盲法对椎动脉血管图像和MPR、CPR图像进行分析.结果：100根椎动脉使用VR、MIP方式进行重建,VR和MIP均能良好显示椎动脉;VR和MIP图像中,共发现椎动脉狭窄6例,其中V1段5例,V2段1例;2例为假阳性.所有病例均成功进行了MPR与CPR重建,MPR示V1段在C6～C2横突孔内上行,走行较直者89根,占89%;11根（11%）由于走行扭曲,无法显示V1段全程;V2段在一个层面上表现为由V1段向外弯曲90°横向走行者77根,占77%,V2段不能在一个层面上完整显示者23根;V3、V4、V5段均不能一个层面上完整显示.CPR是MPR的特殊形式,它可以将V1～5各段拉直后显示于同一图像中,V1～5各段显示率均为100%.MPR与CPR还显示了椎动脉与周围结构的关系以及椎动脉狭窄的原因,CPR显示椎动脉狭窄的原因4例,其中横突孔狭窄压迫椎动脉3例,寰椎骨质增生1例.MPR图像显示狭窄原因3例,均位于V1段,其他1例狭窄MPR图像未见显示.SCTA显示的2例假阳性患者,CPR、MPR图像均未见椎动脉狭窄.结论：MIP与VR在显示椎动脉方面无明显差异,但由于周围骨质影响,MIP耗时较长,而VR则简便、易行,易于推广应用;CPR可直观显示椎动脉与邻近结构的关系,有利于判定狭窄的原因.
Objective： To study the feasibility and clinical value of computed tomography angiography （CTA） and curve planar reconstruction （CPR） of vertebral artery （VA）.Methods：Fifty patients were underwent SCT scanning with bolus trigger technique. The range of examination was from C6 to basilar. Firstly, the CT angingraphy was made by the method of volume rendering （VR） and maximum intensity projection （MIP） from the primitive images, and then multiplanar reconstruction （MPR） and curve planar reconstruction （CPR） was done in basis of VR images. Two neuroradiologists read the images with dual-blind method. Results： VR can demonnstrate VA as good as MIP. The stenosis of VA was shown in 6 patients on VR or MIP images, 5 in V1 segment, 1 in V2 segment; false positive oftbe stenosis were seen in 2 cases. MPR and CPR reconstruction were proceeding in all cases successfully. The V1 segment of VA, which ups in foramen transversarium of C6 - C2, was shown on MPR images. The V1 segment of VA were straight in 89 cases, distorted and can＇ t be shown the whole segment in 11 cases, the V2 segment of VA, which bent 90°outwardly from the V1 segment and walk horizontally, were seen in the same image in 77 cases, and can＇ t be demonswated completely in the same image in 23 cases. The V3, V4 and Vs segment can＇ t be demonstrated completely in the same image in all cases. The CPR is a special form of MPR; it can show each segment of V1-5 in the same image after pulling VA straightly, which the rate of demonstration is 100%. Both MPR and CPR can show the relation between VA and its adjacent structures and show the reason of VA stenosis. The stenosis of VA were shown in 4 cases on the CPR images, the reason of the stenosis were compression of foramen transversarium in 3 cases, hyperostosis of atlas in 1 case. Stenosis of VA was shown in 3 cases on the MPR images, all of which lie in the V1 segment, false negative of stenosis was shown on the MPR image in 1 case. Both CPR and MPR didn＇t show the steno
出处
《医学影像学杂志》
2006年第5期455-459,共5页
Journal of Medical Imaging
关键词
椎动脉
多层螺旋CT血管造影
曲面重建
Multi-slice cr angiography
Vertebral artery
Curve planar reconstruction
