Evaluation of an asymmetric screen-film system for chest radiography.
Evaluation of an asymmetric screen-film system for chest radiography.
复制标题
用于胸部放射线照相的非对称屏幕胶片系统的评估。
DOI：
10.1118/1.597277
复制
发表时间：
1994
期刊：
影响因子：
3.8
通讯作者：
Sukenobu,Y
中科院分区：
文献类型：
--
作者：
Morishita,J;MacMahon,H;Doi,K;Carlin,M;Sukenobu,Y
为了评价非对称屏-片系统在胸部X线摄影中的潜在效用，研究了其与传统屏-片系统相比的图像质量和细节可见性。通过测量Hurter和德里菲尔德曲线、分辨率特性和噪声维纳谱来评价基本成像特性。主观评价胸部体模X线片中模拟解剖和病理细节以及患者胸部X线片中正常解剖的可见性。每个系统的动态范围是相当的，尽管非对称屏-膜系统可以提供优于传统系统的优势，这是由于在高光密度下相对剂量减少约35%和更高的分辨率特性。非对称屏-膜系统的噪声水平在低光密度下略大，在高光密度下大得多。然而，尽管噪声增加，但非对称屏-片系统的肺部细节可见性略优于传统屏-片系统的上级。纵膈和后纵隔的细节相似，尽管不对称屏-片系统略优于上级。可以得出结论，如果平均肺密度保持在比传统系统更高的水平，则非对称屏-片系统提供的胸部X线摄影图像质量略上级传统屏-片系统。
To evaluate the potential utility of an asymmetric screen‐film system for chest radiography, its image quality and detail visibility compared with a conventional screen‐film system are investigated. The basic imaging properties were evaluated by measuring Hurter and Driffield curves, resolution properties, and noise Wiener spectra. The visibility of simulated anatomical and pathological details in radiographs of a chest phantom and normal anatomy in chest radiographs of patients were evaluated subjectively. The dynamic range of each system is comparable, though the asymmetric screen‐film system can provide an advantage over the conventional system due to a relative dose reduction of approximately 35% and higher resolution properties at high optical densities. The noise level of the asymmetric screen‐film system is slightly greater at low optical densities and much greater at high optical densities. However, the visibility of lung details with the asymmetric screen‐film system is slightly superior to the conventional screen‐film system despite the increase in noise. Mediastinal and retrodiaphragmatic details are similar, though marginally superior with the asymmetric screen‐film system. It is concluded that the asymmetric screen‐film system provided slightly superior image quality to the conventional screen‐film system for chest radiography, provided the average lung density is maintained at a higher level than is customary with conventional systems.