http://www.tuscaloosanews.com/apps/pbcs.dll/article?AID=/20061130/NEWS/611300303/1005/SPORTS0106

The foul-tasting barium sulfate that patients have to drink before a CT scan of the digestive system could be replaced by ordinary whole milk, a small study suggests.

Barium sulfate is used to distend the hollow digestive organs so they can be seen in the images produced by the scan. Presumably any liquid could do this, but some liquids, like water, move through the system too quickly, while barium sulfate lingers in the intestines. The researchers found that drinking whole milk before the scan has essentially the same effect, because its fat is digested slowly. The research will be presented at a meeting of the Radiological Society of North America.

The scientists studied 168 patients scheduled for an outpatient CT scan. Before the scan, 62 of them drank about a quart of a diluted barium sulfate solution, and the rest drank whole milk. The barium drink distended the small intestine somewhat more than the milk, but the definition of the intestinal walls was just as clear with milk as with barium.

One additional significant benefit: the milk cost $1.39 per patient, while the barium sulfate cost $18.