摘要
目的:探讨双源CT虚拟单能量成像技术(Mono+)在实影渲染技术条件下提高肝硬化门静脉图像质量的可行性.方法:回顾性分析 60例肝硬化患者的门静脉图像,使用 100/Sn 150kVp双能量扫描模式;用Mono+技术重建出不同低千电子伏特(keV)40、45、50、55、60、65和 70keV图像,用常规线性融合融合出系数为0.5的图像(M-0.5);采用单因素方差分析比较不同单能量和M-0.5图像门静脉的CT值、信噪比(SNR)、对比噪声比(CNR),采用多样本秩和检验分析主观图像质量评分.结果:40keV图像门静脉、脾静脉及肝实质的 CT值、CNR值均高于其他图像,差异有统计学意义;主观评分 40keV、45keV与 60keV、65keV、70keV、M-0.5分别两两相比较,差异有统计学意义.结论:双源CTMono+技术联合实影渲染技术在 40keV下可以提高肝硬化患者门静脉CT血管成像的图像质量.
Abstract
Objective:To explore the feasibility of dual-source CT virtual single-energy imaging technology(Mono+)in improving cirrhosis portal vein image quality under cinematic rendering conditions.Methods:Portal vein images of 60 patients with cirrhosis,acquired in 100/Sn 150 kVp double energy scan mode were retrospectively analyzed.Images of 40,45,50,50,55,60,65,70 keV were reconstructed using Mono+technology and M-0.5 with conventional linear fusion.The CT values,signal-to-noise ratio(SNR),and contrast noise ratio(CNR)of different single-energy M-0.5 portal vein images were compared using single-factor variance analysis.Subjective image quality scores were analyzed using various rank and sum tests.Among the results of 40 keV images,the CT and CNR values of the portal,spleen,and hepatic veins were higher than those of other images,and the differences were statistically significant.Subjective scores of 40 keV,45 keV versus those of 60 keV,65 keV,70 keV M-0.5,showed statistical significance.Conclusion:The dual source CT Mono+technique can improve the image quality of cirrhosis portal vein CT with cinematic rendering.
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