【摘要】 目的:评估能谱CT成像技术对改善颅内动脉瘤夹闭术后体外模型成像质量的应用价值。方法:制作颅内动脉瘤夹闭术后体外模型并进行CT能谱扫描,获取混合能量和22个能谱(Mono、Mono+金属伪影消除(MARs)重建模式)序列;评价图像伪影、血管显示质量和动脉瘤夹情况。结果:能谱序列中标准差(SD)及伪影指数(AI)值随ke V增加呈减少趋势,Mono80~140及Mono+MARs60~140 ke V序列中SD和AI值明显低于混合能量(P<0.05);能谱序列血管CT值随能级ke V增加而减少。Mono70~90和Mono+MARs40~70 ke V序列血管显示完整率高于混合能量(P<0.05);Mono80~130 ke V序列瘤夹质量较好,与混合能量比差别有统计学意义(P<0.05)。结论:能谱CT能有效消减伪影,Mono80~90 ke V序列能有效观察瘤夹、血管及评价动脉瘤夹与血管关系。更多还原

【Abstract】 Objective:To assess the value of energy spectral CT in improving image quality of the intracranial aneurysm clipped phantom. Methods:The phantom was successfully established and underwent energy spectral CT scanning. Multichromatic array and 22 energy spectral(monochrome(Mono)and Mono+metal artifact reducing system(MARs)) arrays were obtained to access the image artifact,quality of vessel display and the clip. Results:The SD and AI values were gradually decreased with the increase of the ke V level and significantly lower than the multichromatic array(P<0.05),specifically in Mono 80~140 and Mono+MARs60~140 ke V arrays. CT value of vessel in the energy spectral array was declined with the increase of the ke V level. The ratio of vessel display was significantly higher in Mono70~90 and Mono+MARs 40~70 ke V arrays than that in the multichromatic array(P<0.05). The clip was displayed better in Mono80~130 ke V arrays than that in the multichromatic array with significant statistical differences(P<0.05). Conclusion:The energy spectral CT can effectually decrease artifact and provide high quality image in the intracranial aneurysm clipped phantom. The clip,vessel and their relationship can be effectively observed in Mono80~90 ke V arrays.更多还原