Radiologists are MDs. They interperet the tests themeslves, that is their whole raison d'etre. He told you exactly what he should have, that he didnt see evidence of crohn's on your test.
It might have been nice if someone had explained to you that the barium xray isn't a great test for it to begin with. It doesn't pick up small ulcerations or apthae-like lesions. That is a common shortcoming of this test.
A better test for small bowel involvement is a pill-cam that you swallow and let take pictures as it travels through you.