Using water-based CT colonography (CTC, or virtual colonoscopy), T1/T2 cancer was diagnosed in 13 of the 38 cases, 20 were staged as T3, and five as T4;

• 水灌肠后应用CT结肠镜成像检查，其中T1/T2期的38名肿瘤患者中诊断出13例，20例被分期为T3期，5粒被诊断为T4。