Barium sulfate contrast medium | Radiology Reference ...
Barium sulfate (BaSO 4), often just called barium in radiology parlance, is an ionic salt of barium (Ba), a metallic chemical element with atomic number sulfate forms the basis for a range of contrast media used in fluoroscopic examinations of the gastrointestinal tract.. Unlike barium and many of its other salts, barium sulfate is insoluble in water and therefore very little of the ...