兔主动脉CTVE重建中阈值与伪影的关系

A Correlation Analysis Test between the Mean Attenuation of Aorta and Artifacts in CTVE

目的 探讨CTVE中阈值的改变对CTVE图像质量的影响。方法 兔主动脉CTVE重建中改变阈值 ,将出现伪影时的阈值与主动脉中心平均CT值作相关性分析。结果 出现伪影时的阈值均与主动脉中心平均密度具有正相关 (r1=0 .6 49,P1<0 .0 5 ;r2 =0 .92 8,P2 <0 .0 5 ;r3 =0 .6 11,P3 <0 .0 5 ) ,且有统计学意义。结论 根据增强后主动脉中心平均CT值可测定CTVE的显示阈值范围 ,从而消除伪影。

Objective To promote the image quality by changing the threshold in CTVE.Methods The mean attenuation of aorta and the threshold at which artifacts appeared were followed in a correlation analysis study.Results A statistically significant correlation was found between mean attenuation of the aorta and the threshold level at which artifacts appeared(r 1=0.649,P 1<0.05;r 2=0.928,P 2<0.05;r 3=0.611,P 3<0.05).Conclusion An artifact-free threshold range can be predicted according to the aortic attenuation after contrast enhancement and thus the artifacts can be minimized.