Sandor T S, Swensson R G
Med Phys. 1978 Sep-Oct;5(5):380-6. doi: 10.1118/1.594510.
This paper presents methods for evaluating the effects of technical factors on observers' detection of small blood vessels in angiographic images. A fixed set of physical parameters was used to generate computer-simulated angiographs that contained blood vessels of various diameters. Observers' judgments about each set of images permitted estimation of the receiver operating characteristic (ROC) curves for vessel detection and of the probability of correctly locating the vessels. Both parametric and nonparametric methods were used to characterize the ROC curves. Three different, but theoretically related, measures of vessel detectability varied systematically with changes in the blood vessel's diameter, reflecting changes in observer performance.
本文介绍了评估技术因素对观察者在血管造影图像中检测小血管效果的方法。使用一组固定的物理参数生成包含各种直径血管的计算机模拟血管造影图像。观察者对每组图像的判断允许估计血管检测的接收器操作特征（ROC）曲线以及正确定位血管的概率。参数法和非参数法都被用于描述ROC曲线。三种不同但理论上相关的血管可检测性测量值随血管直径的变化而系统地变化，反映了观察者性能的变化。
