I'm sorry to say, but this procedure is quite unpleasant. I've had it done twice and the last time my GI mentioned wanting to do it again I said "no way". They do sedate you to put the NG tube down and to start filling your bowels with the solution that they use. By the time your full, you start to wake up and they move you to the CT scan machine where they take the pictures. That part is over quickly but by then you are really feeling like you have to go to the bathroom.
The procedure was able to show the docs where my stricture was located so the surgeon would have a good idea of what he was going to do for my resection. Unfortunately the procedure did not show that my illeum had turned into a round ball of inflammatory mass, nor did it show all the adhesions and fistulazation of bowel to bowel that I had. Since none of this was seen on CT I am not sure I would ever bother doing it again. I don't know if a MRI would be better at seeing what is really going on or not.