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目的 评价多层螺旋CT血管造影术在大血管病变腔内隔绝术或血管搭桥术后复查中的临床应用价值。材料与方法 34例大血管病变腔内隔绝术或血管搭桥术后行多层螺旋CT血管造影术 ,采用准直 2 .5mm ,层厚 3.0mm ,螺距为 6,重建方法为容积漫游技术 (VR)、SSD及MIP ,并对三种方法进行比较。结果 主动脉瘤及夹层动脉瘤行腔内隔绝术后 2 3例 ,血管搭桥术后 7例 ,同时行腔内隔绝术及血管搭桥术后 4例 ;2例出现渗漏 ,VR均能显示 ,SSD、MIP显示 1例。VR图像能清晰显示内支架的位置及形态 ,对搭桥血管的位置、形态、吻合口及远侧段血管情况显示良好 ,明显优于SSD及MIP。结论 多层螺旋CT能在较短时间内进行大范围的扫描 ,有利于大血管病变的检查 ;VR图像优于SSD及MIP ,能为术后情况提供更多信息。
Objective To evaluate the clinical value of multislice spiral CT angiography in the review of endovascular graft exclusion or bypass graft surgery. Materials and Methods 34 cases of major vascular lesions after endovascular graft-assisted or multi-slice spiral CT angiography, using collimation 2.5mm, layer thickness 3.0mm, pitch 6, the reconstruction method for volume roaming technology (VR ), SSD and MIP, and compare the three methods. Results In the aortic aneurysm and dissecting aneurysm, 23 cases were treated with endovascular exclusion and 7 cases after vascular bypass. Simultaneous endovascular graft exclusion and vascular bypass were performed in 4 cases. MIP showed 1 case. VR images can clearly show the position and shape of the stent. The position, shape, anastomotic and distal segment vessels of the bypass graft are well displayed, which is obviously better than SSD and MIP. Conclusions Multi-slice spiral CT can scan in a short period of time, which is good for the detection of macrovascular disease. VR images are better than SSD and MIP, which can provide more information for the postoperative situation.