CHRIS PRIEST / SCIENCE PHOTO LIBRARY CHRIS PRIEST / SCIENCE PHOTO LIBRARY
Woman undergoing barium meal X-ray examination, photographed holding a beaker containing a suspension of white barium sulphate, a radio-opaque contrast medium that is used in radiography of the oesophagus, stomach & intestine. The patient swallows a quantity of the medium whose passsage down the oesophagus and into the stomach may be followed on a digital X-ray system to provide the image visible at left. The radiographer (at right, next to the X-ray source) wears a protective apron to shield herself from exposure to X-rays. Photographed at The Princess Grace Hospital, London.
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