Goodman L R, Foley W D, Wilson C R, Tikofsky R S, Hoffmann R G
Department of Radiology, Medical College of Wisconsin, Milwaukee 53226.
Radiology. 1988 Apr;167(1):83-8. doi: 10.1148/radiology.167.1.3347752.
Prior studies have shown that pneumothorax is one of the more difficult entities to diagnose with digitized radiography. This study was designed to test whether increasing resolution from 1.25 to 2.5 line pairs per millimeter (lp/mm) and image processing (edge enhancement from unsharp masking) would increase accuracy and confidence in the diagnosis of pneumothorax, as well as normal cases and other forms of lung disease. Conventional radiographs were digitized with use of a laser reader and then reformatted as film hard copy. Eleven observers read 35 cases reformatted in three different ways (1.25 lp/mm, 2.5 lp/mm, 1.25 lp/mm unsharp mask). The images with finer resolution (2.5 lp/mm) and unsharp mask images were superior to those with coarser resolution (1.25 lp/mm) for the diagnosis of pneumothorax. There was no difference in diagnostic accuracy for normal patients. For abnormalities other than pneumothorax, the unsharp mask images were significantly worse. Confidence in the diagnosis of pneumothorax and other abnormalities was highest with the finest resolution (2.5 lp/mm).
先前的研究表明，气胸是数字化X线摄影中较难诊断的病症之一。本研究旨在测试将分辨率从每毫米1.25线对提高到2.5线对以及进行图像处理（通过模糊蒙板进行边缘增强）是否会提高气胸诊断的准确性和可信度，以及对正常病例和其他形式的肺部疾病的诊断准确性和可信度。使用激光阅读器将传统X线片数字化，然后重新格式化为胶片硬拷贝。11名观察者阅读了以三种不同方式重新格式化的35个病例（1.25线对/毫米、2.5线对/毫米、1.25线对/毫米模糊蒙板）。对于气胸的诊断，分辨率更高的图像（2.5线对/毫米）和模糊蒙板图像优于分辨率较低的图像（1.25线对/毫米）。正常患者的诊断准确性没有差异。对于气胸以外的异常情况，模糊蒙板图像明显较差。对于气胸和其他异常情况的诊断，分辨率最高（2.5线对/毫米）时信心最高。
