X-ray
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X-rays are a form of energy, just like visible light. In the health care setting, an X-ray machine sends X-rays through the body. For most typical X-rays, the chance of harm is very low.
A computer records the images the X-ray machine creates. Structures that are dense (such as bone) will block most of the X-rays, and will appear white. Metal and contrast media (a special dye used to highlight areas of the body) will also appear white. Air will appear black, and muscle, fat and fluid will appear as shades of gray.
Frequently asked questions
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