How is barium meal contrast divided into several types?

An imaging test involves introducing a substance with a density higher or lower than that of the human body into the area to be examined, and artificially creating a difference in density from the surrounding area to form a contrast for diagnostic purposes. Barium sulfate is a common contrast agent with a density greater than that of the human body, and it is usually administered orally to the human body, so this kind of contrast examination is called barium meal contrast. There are two types of barium meal imaging, one is gastrointestinal barium meal imaging and the other is barium enema, which can diagnose various diseases such as ulcer disease, gastrointestinal tumors, colitis, and so on.