The researchers divided their cohort into two groups: 38 patients received a water enema, and 38 underwent room-air insufflation. After insufflation with air or water, patients were imaged with MDCT.

• 研究人员将患者均分成两组，一半患者接受水灌肠，另一半则采取室内空气注入对比。注入水或空气后患者行螺旋扫描成像。