A technologist will position you on your back on a movable X-ray table. Just before the procedure, a small tube will be inserted into your rectum.
Carbon dioxide will then be gently delivered into your colon through this tube.
Carbon dioxide is naturally absorbed through your colon more easily than air. This should cause less cramping and discomfort.
You may, however, feel cramping, bloating or the need to have a bowel movement.
The table will move slowly through the donut-shaped CT scanner. While this is happening, it is important that you lay very still.
You will be asked to hold your breath for a short period during the scanning portion. The scanning procedure will then be repeated with you lying on your stomach.
The test will take approximately 20 minutes. No recovery time is needed after the procedure. You will be allowed to leave right after it is finished.