Hi CL,
Hmm what about a barium follow through where you drink the barium and do a series of x-rays as it travels your small bowel?
Another option would be barium enaema if its your colon/large bowel that is affected.
CT with contrast is possible.
General Abdominal X-ray.
Nuclear Med scan to look for inflammation. They take some of your blood, spin out the white cells in the lab, tag them with radioactive stuff and give it back to you. Then about 2 hrs later you go have some scans. Had it done in July along with barium follow through, abdo x-ray and CT with contrast (was I busy or what ;-)). They told me it looked for continuing inflammation that may not show up in blood tests or other scans if you are still clinically unwell.
Thats just the ones I can think of off the top of my head. Different scans etc give different pics and definition so they may use a combo with you to put the pieces of the current puzzle together.
Hope this helps and you get some answers soon CL.