A sigmoidoscopy views the lower third of your large intestine using a camera on the end of a flexible tube. The tube is inserted through your anus into your large intestine to look for polyps and other signs of cancer. 乙状结肠镜检查使用软管末端的摄像机观察大肠的下 1/3 段。软管经由肛门插入大肠，检查息肉和其他癌症的迹象。
A colonoscopy also views your large intestine using a similar camera, but it looks along the entire length of your large intestine for polyps or other signs of cancer. 结肠镜检查也使用相似的摄像机观察大肠，但它可以筛查整个大肠内的息肉或其他癌症迹象。
A colonography, also known as virtual colonoscopy, uses CT scans of your large intestine. A computer uses the scans to make a three-dimensional view inside your large intestine to look for signs of cancer. 结肠造影，又称虚拟结肠镜检查，使用 CT 扫描大肠。计算机利用扫描，形成大肠内的三维视图，从而查找癌症迹象。
Sigmoidoscopy
Colonoscopy
Colonography
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