容积重建术和表面成像术在椎动脉CT血管造影中的应用

目的：探讨容积重建术（VR）和表面成像术（SSD）在椎动脉CT血管（CTA）成像中的应用价值。方法：对65例临床疑诊为椎动脉椎病患者作椎动脉CTA检查,采用VR和SSD两种方法重建图像,VR通过容积漫游,SSD通过设置双阈值来显示椎动脉。结果：65例,130例血管显示129例,1支全程闭塞不显示,发现先天变异31支;血管因骨质增生受压移位17处,血管狭窄21例;颅内段血管呈串珠状45处;钙化3处,讨论：VR能清晰显示椎示椎动脉全貌和伴行骨骼的解剖关系,大大提高椎动脉病变的检出阳性率。SSD优良图像仅占50％左右,约半数的病人椎动脉显示不满意,实用价值有待进一步研究。

Application of volume rendering and shaded surface display in CT angiography of vertebral artery

Objective:To evaluate the application of volume rendering (VR) and shaded surface display (SSD) techniques in CT angiography of vertebral artery.Methods:65 patients with suspected cervical spondylopathy of vertebral artery type were performed CT vertebral arteriography.The source images were processed with VR and SSD techniques.The vertebral artery was displayed through volume rendering and through dual threshold establishment in SSD technique,respectively.Results:There were 130 vertebral arteries in 65 patients,of which 129 vertebral arteries were demonstrated,but only 1 was not displayed due to its occlusion of the whole course.129 vertebral arteries showed 17 sites of compressive displacement due to hyperosteogeny,21 of stenosis,45 of beaded appearance of the vessel,and 3 of calcification.Conclusion:95% of VR images are excellent or good,and clearly show the whole picture of the vertebral artery and its anatomical relationship with the adjacent bones.Thus,VR greatly improves the detectability of the pathological changes of the vertebral artery. About half of the SSD images are excellent or good.SSD is used in the detection of intravascular pathology and can be supple ment to the VR technique.