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目的 评价三维CT血管造影 (3D -CTA)在颅内动脉瘤栓塞治疗中的指导意义及其局限性。方法 本组所有患者均进行DSA造影检查和 3D -CTA检查。 3D -CTA图像重建时分别采用最大强度投照 (MIP)、表面成像 (SSD)以及模拟内窥镜 (flyingthrough)等 3种成像方法分别重建颅内血管三维图像。脑血管造影常规进行双侧颈内动脉及左侧椎动脉造影 ,必要时进行右侧椎动脉造影。结果 本组 11例患者 ,DSA造影检查和 3D -CTA检查各发现动脉瘤 11个 ,各漏诊动脉瘤 1个。DSA造影检查动脉瘤最大直径平均 4 .3mm ;3D -CTA检查MIP法测得动脉瘤最大直径平均 4 .5mm ,SSD法动脉瘤最大直径平均 5 .7mm。结论 3D -CTA能够避免常规DSA造影检查时产生的影像重叠 ,但是三维重建后的影像受到多种因素的影响 ,制定合理的检查方案可有效提高诊断符合率。
Objective To evaluate the guiding significance and limitations of three-dimensional computed tomography (3D-CTA) in the treatment of intracranial aneurysm embolization. Methods All patients in our group had DSA and 3D-CTA. Three-dimensional images of intracranial vessels were reconstructed by three imaging methods: maximum intensity projection (MIP), surface imaging (SSD) and flyingthrough, respectively. Cerebral angiography routine bilateral carotid artery and left vertebral artery angiography, if necessary, right vertebral artery angiography. Results The group of 11 patients, DSA angiography and 3D-CTA examination found that aneurysm 11, aneurysm 1 each. DSA angiography the largest diameter of the aneurysm average 4. 3mm; 3D-CTA examination MIP method, the maximum diameter of the aneurysm average 4.5mm, SSD method, the average diameter of the largest aneurysm 5. 7mm. Conclusions 3D-CTA can avoid the overlap of images caused by conventional DSA. However, the three-dimensional reconstruction images are affected by many factors. To develop a reasonable inspection scheme can effectively improve the diagnostic accuracy.