LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY
X-ray machine (centre right) in the radiology department of a hospital. The box above the bed emits X-rays onto a patient lying on the bed. The X-rays pass through the patient and cast an image onto film positioned beneath the bed. The sign at upper right warns when the X-ray machine is in use. X-rays are electromagnetic rays that can penetrate soft tissues, but are absorbed by bones or opaque contrast media, and can therefore be used to diagnose internal injuries and disorders.
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