Crohn disease (CD) is characterized by recurrent attacks. Two common diagnostic methods, computed tomography enterography (CTE) and magnetic resonance enterography (MRE) are used to diagnose and follow-up CD activity. CTE is equipped with special X-ray radiation and can increase the risk of cancer. However, MRE has no X-ray radiation. →What this article adds: No significant difference was found between MRE and CTE in the diagnosis of Crohn's activity. Patients, who are examined with CTE frequently, receive more than 50 msv of radiation per year and are at the risk of developing cancer significantly. Therefore, MRE is much safer than CTE for evaluating the recurrence of CD.