INTRODUCTION The virtual scale endoscope (VSE) is a newly introduced endoscope that helps endoscopists in measuring colorectal polyp size (CPS) during colonoscopy by displaying a virtual scale. This study aimed to determine the usefulness of the VSE for CPS measurement and the educational benefit of using VSE images to improve CPS estimation accuracy. METHODS This study included 42 colorectal polyps in 26 patients treated at Hiroshima University Hospital. In study 1, CPS measured using a VSE before endoscopic mucosal resection was compared with CPS measured on resected specimens, and the agreement between the two measurement methods was evaluated via Bland-Altman analysis. In study 2, 14 endoscopists (5 beginners, 5 intermediates, and 4 experts) took a pre-test to determine the size of 42 polyps. After the pre-test, a lecture on CPS measurement using VSE images was given. One month later, the endoscopists took a post-test to compare CPS accuracy before and after the lecture. RESULTS In study 1, Bland-Altman analysis revealed no fixed or proportional errors. The mean bias ±95% limits of agreement (±1.96 standard deviations) of the measurement error was -0.05 ± 0.21 mm, indicating that the agreement between two measurement methods was sufficient. In study 2, the accuracy of CPS measurement was significantly higher among beginners (59.5% vs. 26.7%, p < 0.01) and intermediates (65.2% vs. 44.3%, p < 0.05) in the post-test than in the pre-test. CONCLUSION The VSE accurately measures CPS before resection, and its images are useful teaching tools for beginner and intermediate endoscopists.

中文翻译：

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虚拟内窥镜在测量结直肠息肉大小方面的实用性和教育效益。

简介 虚拟刻度内窥镜（VSE）是一种新推出的内窥镜，通过显示虚拟刻度帮助内窥镜医生在结肠镜检查期间测量结直肠息肉尺寸（CPS）。本研究旨在确定 VSE 对于 CPS 测量的有用性以及使用 VSE 图像提高 CPS 估计准确性的教育效益。方法 这项研究纳入了在广岛大学医院接受治疗的 26 名患者的 42 例结直肠息肉。在研究 1 中，将内镜粘膜切除术前使用 VSE 测量的 CPS 与切除标本上测量的 CPS 进行比较，并通过 Bland-Altman 分析评估两种测量方法之间的一致性。在研究 2 中，14 名内窥镜医师（5 名初学者、5 名中级和 4 名专家）进行了预测试，以确定 42 个息肉的大小。预测试结束后，进行了使用VSE图像进行CPS测量的讲座。一个月后，内窥镜医师进行了一次后测，以比较讲座前后的 CPS 准确性。结果 在研究 1 中，Bland-Altman 分析显示没有固定误差或比例误差。测量误差的平均偏差±95%一致性限度（±1.96标准差）为-0.05±0.21mm，表明两种测量方法之间的一致性是足够的。在研究 2 中，初级者（59.5% vs. 26.7%，p < 0.01）和中级者（65.2% vs. 44.3%，p < 0.05）在后测中 CPS 测量的准确性显着高于前测。测试。结论 VSE 可准确测量切除前的 CPS，其图像对于初级和中级内窥镜医师来说是有用的教学工具。