冠状动脉CT成像钙化积分扫描噪声与增强扫描噪声的相关性分析  

Correlation between the noise of calcium scoring image and the noise of contrast-enhanced image in CT coronary angiography

作　　者：付维东[1] 龚建平[1] 宦坚[1] 张伟[1] 乔方[1] 钱铭辉[1] 

机构地区：[1]苏州大学附二医院影像科,江苏215004

出　　处：《放射学实践》2011年第3期314-316,共3页Radiologic Practice

摘　　要：目的:分析冠状动脉CT血管成像(CCTA)中对比增强前后图像噪声值的关系,探讨一种预测CTCA图像噪声的方法,从而为实施个体化剂量管理提供依据。方法:回顾性分析固定各扫描序列曝光参数的82例64层螺旋CT回顾性门控冠状动脉CTA的图像资料,研究钙化积分扫描(CACS)图像噪声(SD1)与对比增强扫描图像噪声(SD2)之间的线性相关性,以及体重指数(BMI)与对比增强扫描图像噪声(SD2)之间的线性相关性,并拟合出直线方程。结果:SD1与SD2之间直线相关系数r=0.94(P<0.0001),线性方程为SD2=1.29624×SD1+1.20457;BMI与SD2之间的直线相关系数r=0.80(P<0.0001),线性方程为SD2=1.56067×BMI-10.76970。结论:在CTA各序列的曝光参数不变的情况下,对比增强前后图像噪声值之间存在高度线性相关性。钙化积分扫描噪声比体重指数能更精确地预测增强扫描图像的噪声,从而使基于钙化积分扫描噪声的个体化剂量控制成为可能。Objective：To analyze the relationship of image noise before and after contrast-enhancement in CT coronary angiography,and develop a method of predicting the image noise of CT angiography in orde to provide the basis for individual control on radiation dose of CT angiography.Methods：Eighty two consecutive patients were analyzed retrospectively.Their exposure parameters of every type of scanning series were invariable.The linear correlation between the noise of calcium scoring images（SD1） and the noise of contrast-enhanced images（SD2）,and the linear correlation between body mass index（BMI） and the noise of contrast-enhanced images（SD2） were studied;their linear equations were calculated as well.Results：The linear correlation coefficient between SD1 and SD2 was r=0.94（P0.0001）,it＇s linear equation was SD2=1.29624×SD1＋1.20457.The linear correlation coefficient between BMI and SD2 was r=0.80（P0.0001）,it＇s linear equation was SD2=1.56067×BMI-10.76970.Conclusion：If the exposure parameters of calcium scoring scan and contrast-enhanced scan are invariable,there is a high linear correlation in nosie of images before and after contrast-enhancement.The noise of calcium scoring images can predict the noise of contrast-enhanced images more precisely than body mass index,so it is possible to individually control the exposure radiation of CT angiograhpy depending on the noise of calcium scoring images.

关 键 词：冠状动脉 钙化积分 体重指数 噪声 体层摄影术 X线计算机 辐射剂量 

分 类 号：R816.2[医药卫生—放射医学]