Knyrim K, Seidlitz H, Vakil N, Hagenmüller F, Classen M
II Medical Clinic, Technische Universität München, Federal Republic of Germany.
Gastroenterology. 1989 Mar;96(3):776-82.
Electronic (video) endoscopes are a significant new development in gastroenterology, offering the potential of enhanced teaching and permanent storage of pictorial data. The primary concern of gastroenterologists is the resolution and color performance of these instruments, as these parameters have important bearings on the ability to discern pathological changes in mucosa. We sought to determine the resolution and color capabilities of electronic colonoscopes and compare them with a conventional fiber colonoscope. Resolution was determined using a standard test chart at various distances and the number of picture elements (a measure of resolution) was calculated. The mean number of picture elements was Fujinon (219), Fiber (172), Pentax (169), Toshiba (142), Olympus (140), and Welch Allyn (133). In close focus examination (target distances less than 1 cm), the Fujinon and Toshiba endoscopes had significantly higher resolution than the other instruments. Color was measured quantitatively using a standard color chart and a color analyzer. Color polygons were plotted for each endoscope on a reference chromaticity diagram. All systems had an acceptable overall performance but color was undersaturated with some systems. The optical performance of electronic endoscopes has improved considerably since the inception of electronic endoscopy.
电子（视频）内窥镜是胃肠病学领域一项重大的新进展，具有增强教学效果和永久存储图像数据的潜力。胃肠病学家主要关注的是这些仪器的分辨率和色彩表现，因为这些参数对于辨别黏膜病理变化的能力有着重要影响。我们试图确定电子结肠镜的分辨率和色彩能力，并将其与传统纤维结肠镜进行比较。使用标准测试图在不同距离下测定分辨率，并计算像素数量（分辨率的一种度量）。像素的平均数量依次为富士能（219）、纤维（172）、宾得（169）、东芝（142）、奥林巴斯（140）和伟伦（133）。在近距离聚焦检查（目标距离小于1厘米）中，富士能和东芝内窥镜的分辨率明显高于其他仪器。使用标准色卡和色彩分析仪对色彩进行定量测量。在参考色度图上为每个内窥镜绘制色彩多边形。所有系统的整体性能都可接受，但有些系统的色彩饱和度不足。自电子内窥镜问世以来，其光学性能有了显著提高。
