Chest X-Ray

A chest X-ray is a quick, low-dose picture of the lungs, heart and chest wall. It is the standard first test for asbestos-related disease and the film a B-reader classifies under the ILO system. It can show pleural plaques, pleural thickening, fluid and the scarring of asbestosis, though it misses milder changes that CT can find.

Origin

X-rays were discovered by Wilhelm Roentgen in 1895, and chest films were soon used to study lung disease, including the dust diseases of miners and factory workers. The International Labour Office developed a standard way to classify dust-disease films in the 1930s, and its classification has been revised several times since, most recently to include digital images.

Significance in Asbestos Context

For most people with asbestos exposure, the chest X-ray is where the medical record begins. Small irregular opacities in the lower lungs suggest asbestosis; plaques along the chest wall or diaphragm, sometimes calcified, show past exposure. A B-reader, a doctor certified by NIOSH, grades the film on the ILO scale, and asbestos trusts and courts rely on that grading: a profusion of 1/0 or higher is the usual threshold for asbestosis, and 2/1 for severe asbestosis. An X-ray has limits. It can miss early scarring and small plaques, fat along the chest wall can look like thickening, and it cannot diagnose mesothelioma or lung cancer on its own; a suspicious finding leads to CT and often a biopsy. Older films are valuable, because comparing films over years shows whether changes are new, stable or getting worse, which helps doctors and also helps establish when a disease first appeared.

Example Sentence

A routine chest X-ray showed calcified plaques on both sides of his diaphragm, and a B-reader later classified the film as showing bilateral pleural disease.

Related Terms

B-Read, B-Reader, ILO Classification, Posteroanterior (PA) View, Pleural Plaques, Asbestosis, CT Scan, High-Resolution CT (HRCT)

Notes

• Ask hospitals and clinics for copies of old chest films (images, not just reports); comparison over time is valuable.
• A normal X-ray does not rule out asbestos disease; CT is more sensitive.
• Tell the technician and your doctor about your asbestos exposure so the film is read with that in mind.