Evaluation of an Enhanced Digital Film-Duplication System by Receiver Operating Characteristic Analysis

    loading  Checking for direct PDF access through Ovid


RATIONALE AND OBJECTIVES. Over- or underexposure often results in poor quality radiographs. Using receiver operating characteristic analysis, the authors investigated the potential utility of a system that corrects densities in such images to improve the accuracy of lung nodule detection.METHODS. Chest radiographs were digitized by a laser film digitizer. Simulated nodules were superimposed on 36 improperly exposed chest radiographs. All images, with and without nodules, were then processed by a nonlinear density-correction technique. Hard-copy images were produced by a laser film printer. Eight radiologists evaluated the corrected and uncorrected images for the presence or absence of lung nodules using a continuous (0–100) confidence-rating scale.RESULTS. The detectability of lung nodules improved significantly in the retrocardiac/retrodiaphragmatic regions of underexposed images and in the peripheral lung region of overexposed images.CONCLUSIONS. This system may increase diagnostic accuracy in detection of lung nodules in improperly exposed images.

    loading  Loading Related Articles