Which element is a soft silvery metallic element of the alkaline earth group used as a contrast material?

Which element is a soft silvery metallic element of the alkaline earth group used as a contrast material?

• A. Barium
• B. Radiolucent
• C. Nuclear medicine
• D. Radiography

Answer: (A)

In radiographic imaging, a soft, silvery metal from the alkaline earth group is used as a contrast material because its compounds are radiopaque and create a clear outline of structures on X-rays. That element is barium. Barium sulfate, in particular, coats the gastrointestinal tract and is not absorbed, so it blocks X-rays effectively to highlight the GI tract during imaging. The other options describe properties or modalities rather than an element: radiolucent refers to something that does not show on X-rays; nuclear medicine and radiography are imaging methods rather than elements or contrast materials.

In radiographic imaging, a soft, silvery metal from the alkaline earth group is used as a contrast material because its compounds are radiopaque and create a clear outline of structures on X-rays. That element is barium. Barium sulfate, in particular, coats the gastrointestinal tract and is not absorbed, so it blocks X-rays effectively to highlight the GI tract during imaging. The other options describe properties or modalities rather than an element: radiolucent refers to something that does not show on X-rays; nuclear medicine and radiography are imaging methods rather than elements or contrast materials.