ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Barium swallow X-ray. Elderly male patient swallowing barium during an X-ray examination. Barium, a suspension of barium sulphate, is opaque to the X-rays produced by the X-ray machine at right. This procedure enables the detection of diseases or abnormalities of the oesophagus, stomach and upper intestine.
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