Kido S, Kuriyama K, Hosomi N, Inoue E, Kuroda C, Horai T
Department of Computer Science and Systems Engineering, Faculty of Engineering, Yamaguchi University, Japan.
J Digit Imaging. 2000 Feb;13(1):33-7. doi: 10.1007/BF03168338.
This study endeavored to clarify the usefulness of single-exposure dual-energy subtraction computed radiography (CR) of the chest and the ability of soft-copy images to detect low-contrast simulated pulmonary nodules. Conventional and bone-subtracted CR images of 25 chest phantom image sets with a low-contrast nylon nodule and 25 without a nodule were interpreted by 12 observers (6 radiologists, 6 chest physicians) who rated each on a continuous confidence scale and marked the position of the nodule if one was present. Hard-copy images were 7 x 7-inch laser-printed CR films, and soft-copy images were displayed on a 21-inch noninterlaced color CRT monitor with an optimized dynamic range. Soft-copy images were adjusted to the same size as hard-copy images and were viewed under darkened illumination in the reading room. No significant differences were found between hard- and soft-copy images. In conclusion, the soft-copy images were found to be useful in detecting low-contrast simulated pulmonary nodules.
本研究旨在阐明胸部单次曝光双能减影计算机X线摄影（CR）的实用性以及软拷贝图像检测低对比度模拟肺结节的能力。12名观察者（6名放射科医生、6名胸科医生）对25套含有低对比度尼龙结节的胸部体模图像和25套不含结节的常规及骨减影CR图像进行解读，他们以连续的置信度量表对每张图像进行评分，若存在结节则标记其位置。硬拷贝图像为7×7英寸的激光打印CR胶片，软拷贝图像显示在具有优化动态范围的21英寸非隔行彩色阴极射线管显示器上。软拷贝图像调整为与硬拷贝图像相同的尺寸，并在阅片室的暗室照明下观看。硬拷贝图像和软拷贝图像之间未发现显著差异。总之，发现软拷贝图像在检测低对比度模拟肺结节方面是有用的。
