Chest radiographs are recommended for prevention and detection of pneumoconiosis. The present study compared results of classifications of digital chest images performed using the new ILO digitized standard images to classification approaches used in the past. Somespecific differences in the results were seen and noted. However, intrareader variability in this study was similar to the published values and did not appear to be affected by the use of the new ILO digitized standard images.
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Since , the ILO has periodically published guidelines on how to classify radiographs for pneumoconioses External. The purpose is to describe and codify radiographic abnormalities of pneumoconioses in a simple, systematic, and reproducible manner.
Final revisions to the latest edition were completed in ILO The Classification System includes the Guidelines and two sets of standard films. The standard films represent different types and severity of abnormalities and are used for comparison to subject films during the classification process. It deals with parenchymal abnormalities small and large opacities , pleural changes, and other features associated, or sometimes confused, with occupational lung disease. In the present manifestation of the ILO system, the reader is first asked to grade film quality.
They are then asked to categorize small opacities according to shape and size. The size of small round opacities is characterized as p up to 1. Irregular small opacities are classified by width as s, t, or u same sizes as for small rounded opacities. Large opacities are defined as any opacity greater than 1 cm that is present in a film. These are classified as category A for one or more large opacities whose combined dimension does not exceed 5 cm , category B for one or more large opacities whose combined dimension exceeds 5 cm but does not exceed the equivalent area of the right upper lung zone , or category C size is greater than category B.
Pleural abnormalities are also assessed with respect to location, width, extent, and degree of calcification. Finally, other abnormal features of the chest radiograph can be commented upon ILO See the Guidelines for the Use of the ILO International Classification of Radiographs of Pneumoconioses for a full description and exact definition of terms and entities.
Normal Radiograph. Section Navigation. Classification Scheme The Classification System includes the Guidelines and two sets of standard films. Links with this icon indicate that you are leaving the CDC website.
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The ILO International Classification of Radiographs of Pneumoconioses is a system of classifying chest radiographs X-rays for persons with a or, rarely, more than one form of pneumoconiosis. The intent is to provide a standardized, uniform method of interpreting and describing abnormalities in chest x-rays that are thought to be caused by prolonged dust inhalation. In use, it provides a system for both epidemiological comparisons of many individuals exposed to dust and evaluation of an individual's potential disease relative to established standards. Since , the International Labour Organization  has been a specialized agency of the United Nations , with objectives including establishing and overseeing international labor standards and labor rights. Since , the ILO has periodically published guidelines on how to classify chest X-rays for pneumoconiosis. The purpose of the Classification was to describe and codify radiographic abnormalities of the pneumoconioses in a simple, systematic, and reproducible manner, aiding international comparisons of data, epidemiology, screening and surveillance, clinical purposes, and medical research.