Digestive tract imaging. What?

Digestive tract radiography is divided into two parts, one is the digestive tract and the other is radiography. It includes the mouth, throat, esophagus, stomach, small intestine and large intestine. radiography is an examination method. In general, x-rays are basically not easy to distinguish these structures of the mouth, throat, esophagus and gastrointestinal tract, so barium sulfate needs to be given to the patient to drink into the digestive tract, and then barium forms an x-ray contrast to see the digestive tract. After observation, you can see that the inner surface of the digestive tract where barium sticks is white, and if it doesn't stick is black. Through the contrast between black and white, you can see the movement of the digestive tract, whether the digestive tract is narrow, whether there is abnormal expansion, whether there is a tumor inside, and whether adjacent organs or lesions will cause compression of the digestive tract.