【摘要】 目的:评价CT血管造影(CTA)减影术在颅内动脉瘤诊断中的应用价值。方法:采用CT血管造影检查拟诊颅内动脉瘤33例,图像分别运用A(经减影后)及B(常规)进行两次三维(3D)成像:最大密度投影(MIP)、表面遮盖成像(SSD)、容积重建(VR)。以手术或随访为标准评价两种检查结果;由两位有经验的神经外科医生、两位放射科医生双盲法评价图像质量。结果:A法检出动脉瘤36个(三例患者为多发动脉瘤),显示瘤体、瘤颈、载瘤动脉和周围血管的关系清晰、确切。B法检出动脉瘤31个,漏检1个大脑前动脉瘤2、个前交通动脉瘤、2个颈内动脉瘤。A法的检出率为100%,B法的检出率为86%。两者检出率经χ2检验有统计学意义。结论:CTA减影3D成像对颅内动脉瘤的诊断优于常规3D。更多还原

【Abstract】 Objective:To evaluate the clinical value of subtraction CT angiography(CTA) in the intracranial aneurysms.Methods:33 cases were examined by CTA. The obtained images were 3D postdisposed with(method A) and without(method B) subtraction respectively.Two sets of the images were reconstructed using the techeniques of maximum intensity(MIP),shaded surface display(SSD) and volume rendering(VR).In evaluating all the images by two experienced neurologists and two radiologists,double blind method were adopted.Results:By the method A 36 intracranial aneurysms were detected in 33 cases,aneurysmal body and neck,parent artery and relationship to adjacent vessels were displayed clearly and exactly.While by method B only 29 aneurysms were detected,1 anterior cerebral artery anerrysm,2 anterior communication and artery carotis interna anerrysms were not displayed.The detecting rate of the aneurysm were 100%,with high ratio by method A than 86% by method B(χ~2=5.13,P<0.05).Conclusion:The 3D subtraction CTA is superior to 3D CTA in the diagnosis of intracranial aneurysms.更多还原