Establish specific imaging signs of different type IO, raise the rate of early correctly diagnosis of severity type ileus such as volvulus,entocele, intussusception.

• 3.；建立不同类型肠梗阻的特异性影像学征象；提高严重肠梗阻类型如肠扭转、肠内疝及肠套叠早期正确诊断率。