Colorectal cancer (CRC) is among the most commonly diagnosed cancers and causes of death from cancer across the world. CRC can, however, be detected in asymptomatic patients at a curable stage, and several studies have shown lower mortality among patients who undergo screening compared with those who do not. Using colonoscopy in CRC screening also results in the detection of precancerous polyps that can be directly removed during the procedure, thereby reducing the incidence of cancer. In the past decade, convincing evidence has appeared that the effectiveness of colonoscopy as CRC prevention tool is associated with the quality of the procedure. This review aims to provide an up-to-date overview of recent efforts to improve colonoscopy effectiveness by enhancing detection and improving the completeness and safety of resection of colorectal lesions.

大肠癌（CRC）是世界上最常见的癌症和癌症致死原因之一。但是，可以在无症状患者的可治愈阶段检测到CRC，一些研究表明，接受过筛查的患者与未接受筛查的患者相比，死亡率较低。在CRC筛查中使用结肠镜检查还可以检测出可以在手术过程中直接切除的癌前息肉，从而降低了癌症的发病率。在过去的十年中，令人信服的证据表明，结肠镜检查作为CRC预防工具的有效性与手术质量有关。这篇综述旨在提供最新的概述，以期通过增强检测和提高结直肠癌切除术的完整性和安全性来改善结肠镜检查的有效性。