Compare MR enterography and CT enterography in evaluating small-bowel Crohn's disease.

• A. MR enterography uses ionizing radiation and CT does not
• B. MR enterography uses no ionizing radiation and provides excellent soft tissue contrast; CT enterography is faster and widely available but involves radiation
• C. CT enterography is slower and more available; MR is radiation-free
• D. CT is never used for Crohn's evaluation

Answer: (B)