Barium Sulfate: What It Is and How It's Used in Medical Imaging

The metallic powder that is introduced to the large intestine and x-rays are taken is called barium sulfate. It is a white, odorless, and tasteless powder that is mixed with water to form a liquid that can be easily swallowed. Barium sulfate coats the walls of the large intestine and makes it visible on x-rays. This allows doctors to see any abnormalities, such as polyps, tumors, or inflammation.