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Normal chest x-ray. A=Airway; B=Bone, C=Cardiac silhouette, D=Diaphragm, E=Edge of the heart, F=Field of lung, G=Gastric bubble, H=Hilum of lung.You have probably seen a chest x-ray (chest radiograph), or might even have had one taken. Have you ever wondered how to read a chest x-ray? Here is a quick and easy approach by following these simple steps and using the mnemonic ‘ABCDEFGHI’.
When looking at a radiograph, remember that it is a 2-dimensional representation of a 3-dimensional object. Height and width are maintained, but depth is lost. The left side of the film represents the right side of the individual, and vice versa. Air appears black, fat appears gray, soft tissues and water appear as lighter shades of gray, and bone and metal appear white. The denser the tissue, the whiter it will appear on x-ray. Denser tissues appear radiopaque, bright on the film; less dense tissues appear radiolucent, dark on the film.
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