Barium swallow Is an x-ray examination of the pharynx esophagus & stomach. Images are produced using a special form of x-ray called fluoroscopy & an orally ingested contrast material such as barium sulphate liquid. Fluoroscopy makes it possible to see internal organs in motion. When the upper GI tract is coated with barium, the radiologist is able to view and assess the anatomy and peristalsis function . In addition to drinking barium, some patients are also given baking-soda crystals to further