![]() ![]() When deemed necessary, an adjustment of the profusion category may be appropriate, based upon the anticipated influence of quality factors on the comparison of the subject radiograph and the ILO standard. Digital radiographic systems should be monitored to avoid linear artifacts, or noise/mottle, which can suggest small pneumoconiotic opacities, and post processing software functions should be set to the minimum edge enhancement permitted by the system, to facilitate comparisons to ILO digital standard radiographs.Īfter selecting the one or two standard images that visually appear to most closely match the subject radiograph, the reader should weigh the potential impact of any quality factors on the appearance of parenchymal opacities. Localized effects may be due to superimposed bony structures, soft tissues, or foreign bodies (e.g., pacemakers, tubing, clothing, etc.). Quality effects may be generalized throughout the image, or limited to specific lung zones.įactors that can influence perception of opacities may be related to the image contrast, resolution, exposure, or gray scale, as well degree of inflation, body position, or movement during the examination. ![]() ![]() Depending on the type of opacities being evaluated, the appearance and perception may be altered, accentuated, or diminished. However, regardless of the imaging modality, readers completing ILO classifications should assess the quality of the image in each lung zone. The quality of modern digital chest radiographs is often better than film images, especially with appropriate use of window and level functions. Historically, variations in image quality have been shown to have an important effect on the small opacity profusion category selected by the reader. Quality appraisals are therefore appropriately the first items recorded on the classification form. Radiograph Classification Subset 1 Section 1: Image QualityĪssessment of image technical quality is critically important prior to performing an ILO classification. ![]()
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