Barium meal

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A barium meal is a procedure in which barium sulfateis ingested by a patient and, in conjunction with X-rays, images depicting the digestive system: the distal esophagus, stomach and duodenum, are obtained. There are two varieties of barium meal, these being single and double contrast meals. A single contrast meal uses only barium to image the upper gastrointestinal tract while a double contrast meal uses barium as well as air. The double contrast meal has the advantage of demonstrating mucosal details and so is much more useful as a diagnostic test allowing the detection of small mucosal lesions.

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It uses material from the http://en.wikipedia.org/wiki/Barium+meal Wikipedia article Barium meal.