Månsson L G, Kheddache S, Schlossman D, Börjesson J, Håkansson E, Mattsson S, Tylén U
Department of Radiation Physics, Sahlgrenska Sjukhuset, University of Gothenburg, Sweden.
Acta Radiol. 1989 Jul-Aug;30(4):337-42.
A digital system for chest radiography based on a large image intensifier was compared with a conventional film-screen system. The diagnostic performance was evaluated with special reference to the digital monitor images with a modified version of receiver operating characteristic (ROC) analysis--free response ROC (FROC) analysis--on a chest equivalent phantom. Measurements of spatial resolution and energy imparted were also performed. The detectability of low-contrast objects as well as spatial resolution was better for the full-size film-screen radiographs than for both the digital monitor images and the 100 mm photofluorograms. The image-intensifier system has a potential for considerable dose savings in relation to the conventional technique provided that fluoroscopy is excluded in the positioning of the patients.
基于大型影像增强器的胸部X线摄影数字系统与传统的屏-片系统进行了比较。采用改良版的接收者操作特征（ROC）分析——自由响应ROC（FROC）分析，在胸部等效体模上对数字监视器图像的诊断性能进行了评估。还进行了空间分辨率和能量传递的测量。对于低对比度物体的可检测性以及空间分辨率，全尺寸屏-片X线照片优于数字监视器图像和100毫米荧光缩影照片。如果在患者定位过程中不进行荧光透视，与传统技术相比，影像增强器系统有大幅节省剂量的潜力。
