I agree with MikeB, but perhaps a high quality cat scan can help. My daughter's GI showed her the cat scan, which clearly showed a stricture as well as the ballooning of the intestinal wall just before the stricture.
Both SBFT and cat scan are preferable to colonoscopies if the small intestine is very inflamed. I believe the risk of perforation during a colonoscopy, albeit slight, rises if there is rampant inflammation.
The SBFT was very useful in showing the state of the intestinal wall (granuloma) and whether there were any fistulas (none, in her case).