Before the start of the examination, the patient is asked to remove metal objects and take a position on the X-ray table. After this, a contrast substance based on barium sulfate is slowly introduced through the rectum, which fills the large intestine and makes it possible to obtain clear X-ray images.
During the procedure, a series of images is taken in different projections to assess the shape, contours, and patency of the large intestine. In some cases, after the intestine is filled with the contrast substance, air is additionally introduced. This helps to better straighten the intestinal walls and assess its inner surface in more detail.
During the procedure, the patient may feel moderate pressure, abdominal bloating, or urges to defecate, but usually the examination is tolerated well. On average, irrigoscopy lasts 20–40 minutes.
After the examination, the radiologist analyzes the obtained images and prepares a conclusion. With the results, one should contact the doctor who referred for the examination — a gastroenterologist, proctologist, or another specialist, in order to correctly assess the detected changes and determine the further tactics of diagnosis or treatment.