McLean D, Gray J E, Swensen S J, Vrieze T J
School of Medical Radiation Technology, University of Sydney, Australia.
Eur J Radiol. 1998 Mar;27(1):61-6. doi: 10.1016/s0720-048x(97)00031-4.
A new twin screen-film cassette system optimised for conventional chest radiography was evaluated by four thoracic radiologists.
The twin screen-film cassette system produces two film images, the front film optimised for the mediastinal region of the chest, the rear for the lung region. Image degradation on either screen-film system due to internal photon scatter has been virtually eliminated due to the use of a dividing filter. Fifty patients were included in a trial that resulted in a set of chest images for each patient, taken on the same inspiration, by both the twin screen-film cassette and the conventional system. The resultant fifty sets of images were evaluated by four chest radiologists who scored 12 radiographic features of the chest and patient pathologies present, using a paired difference technique.
The image quality of the twin screen-film cassette system was judged to be significantly superior to the conventional screen-film system in nine of the 12 radiographic features scored (P < 0.003). In the three other regions and for the patient pathologies, no significant conclusions were drawn.
The new twin screen-film system showed improved visualisation of radiographic features, particularly in the mediastinal and retrocardiac lung regions. This new system shows promise in both standard and portable clinical applications.
四位胸科放射科医生对一种为传统胸部X线摄影优化的新型双屏-胶片暗盒系统进行了评估。
该双屏-胶片暗盒系统可产生两张胶片图像，前一张胶片针对胸部纵隔区域进行了优化，后一张针对肺部区域。由于使用了分隔滤光片，两个屏-片系统中因内部光子散射导致的图像质量下降已基本消除。五十名患者参与了一项试验，试验结果是每位患者分别使用双屏-胶片暗盒系统和传统系统在相同吸气状态下拍摄了一组胸部图像。四位胸科放射科医生对这五十组图像进行了评估，他们采用配对差异技术对胸部的12项影像学特征和存在的患者病变进行了评分。
在评分的12项影像学特征中，有9项认为双屏-胶片暗盒系统的图像质量明显优于传统屏-片系统（P < 0.003）。在其他三个区域以及针对患者病变方面，未得出显著结论。
新型双屏-胶片系统在影像学特征的显示上有所改善，尤其是在纵隔和心后肺区域。该新系统在标准和便携式临床应用中均显示出前景。
