Department of Radiology;
The First Affiliated Hospital of Fujian Medical University;
Fuzhou 350005;
Fujian Province;
China;
Department of Biomedical Sciences;
University of Pennsylvania;
Philadelphia;
PA 19104;
United States;
Department of Diagnosis Imaging;
Siemens Healthcare Ltd;
Shanghai 201318;
China;
Crohn’s disease; Ileum; Magnetic resonance imaging; Diffusion-weighted imaging; Perfusion imaging;