X-rays are a form of electromagnetic radiation (like light); because they are of higher energy than visible light, they can penetrate the body to produce an image. Structures that are dense (such as bone) will appear white, air will be black, and other structures will be shades of gray depending on density.
Reviewed By: Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital.
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