To ensure the generalizability of classification performance, a performance verification (prospective validation) test was carried out using external‐test datasets from other institutions. This external‐test set was gathered from consecutive patients who underwent upper gastrointestinal endoscopy at Gangneung Asan Hospital between 2018 and 2020. A total of 1427 new images from 1427 patients were collected that were not used in the training or internal‐testing of the established model. All external‐tests were performed using GIF‐Q260, H260, or H290 endoscopes (Olympus Optical Co., Ltd.) in conjunction with an endoscopic video imaging system (Evis Lucera CV‐260 SL or Elite CV‐290; Olympus Optical Co., Ltd.). Table 1 describes the detailed distribution of the external‐test dataset.
Elite cv 290
Manufactured by Olympus
Sourced in Japan
The Elite CV-290 is a high-performance centrifuge designed for laboratory applications. It features a robust construction and a powerful motor capable of reaching speeds up to 29,000 RPM. The centrifuge provides precise speed and time control, ensuring consistent and reliable results.
Automatically generated - may contain errors
4 protocols using elite cv 290
1
Prospective validation of endoscopic AI model
2
Gastric Mucosal Examination Protocol
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Procedures were performed by expert endoscopists using pharyngeal local anaesthetic spray Xylocaine (AstraZeneca, Luton, UK) or conscious sedation (midazolam/pethidine) according to patient preference. A black soft rubber hood (MB46, MAJ-1990, Olympus) was attached to the endoscope tip to allow a fixed 2mm distance between gastric mucosa and gastroscope. All procedures were done with high definition and magnification Gastroscopes (GIF-FQ260Z; Olympus Optical, Tokyo, Japan) and Lucera Elite CV290 video processor. The video images were viewed on a high definition video monitor (OEV-191H, Olympus). During the procedure the mucosa was washed with a mixture containing 100ml of water mixed with 2ml of acetylcysteine (200mg/ml, Parvolex, Celltech, UK) and 0.5ml (40mg/ml) dimethicone (Infacol, Forrest Laboratories, UK). Detailed examination of the gastric mucosa was then carried out, in WLE and then NBI using both low magnification and magnified views. Still digital images were recorded in both WLE and NBI, with biopsies taken from the areas where the digital images were recorded. A minimum of 8 images were recorded for each patient. All still images were transferred to an external hard drive.
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Gastric Cancer Diagnosis and Staging
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All individuals underwent NBI or BLI endoscopy (endoscopes: GIF-Q260, H260, H260Z, H290, HQ290 or H290Z; EG-L590WR or -L600ZW) with an electronic endoscopic system (Elite CV-290: Olympus Medical Systems, Tokyo; LASEREO: Fujifilm Holdings, Tokyo). The histology, macroscopic type, and depth of invasion in the resected materials obtained by ESD and biopsy specimens fulfilled the gastric cancer criteria of the Japanese Gastric Cancer Association
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All individuals underwent NBI or BLI endoscopy (endoscopes: GIF-Q260, H260, H260Z, H290, HQ290 or H290Z; EG-L590WR or -L600ZW) with an electronic endoscopic system (Elite CV-290: Olympus Medical Systems, Tokyo; LASEREO: Fujifilm Holdings, Tokyo). The histology, macroscopic type, and depth of invasion in the resected materials obtained by ESD and biopsy specimens fulfilled the gastric cancer criteria of the Japanese Gastric Cancer Association
20 (link)
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Endoscopic Evaluation of Esophageal Palisade Vessels
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All patients underwent image-enhanced endoscopy (endoscopes: GIF-Q260, -H260, -H260Z, -H290, -HQ290, or -H290Z; Olympus Medical Systems, Tokyo, Japan) with an electronic endoscopic system (Elite CV290; Olympus Medical Systems). Endoscopy was performed by a single highly experienced endoscopist (T.T.) certified by the Japan Gastroenterological Endoscopy Society. Patients lay on their left side, with the upper body slightly elevated under conscious sedation. After air was suctioned from the stomach, the examinee inhaled deeply with the lower esophagus adequately stretched and endoscopic observation of the palisade vessels was performed using white light imaging (WLI) first, followed by NBI for visualizing the palisade vessels if they were undetectable by WLI [27 (link),28 (link)]. All NBI images of palisade vessels were obtained in normal mode with confirmation under magnification. During observation, we adequately washed the esophageal mucosa with dimethicone solution. The location of the tumor epicenter was defined as the mid-point on the longitudinal axis, and the distance of tumor invasion from the EGJ line was estimated based on the endoscope’s diameter or measured directly if the length was within 1 or 2 cm.
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