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- W2807098081 abstract "Missed visualization of colonic surface area is likely a major cause of missed neoplasia at colonoscopy and subsequent postcolonoscopy cancer. Novel technology that calculates missed surface area in near real time could improve endoscopic technique and adenoma detection, and provide an objective measure of procedure quality. To determine percentage of colonic surface area missed at colonoscopy using a 3D reconstruction of colonoscopy video. We developed and evaluated a new medical imaging analysis and display system that reconstructs colonoscopy video into a 3D rendering of the colonic surface called a colonoscopogram, or C-gram. The C-gram reconstructions of video sections taken from patients at a single center were then used to calculate missed surface area. To make the C-grams, useful video frames of colonic mucosa were first culled automatically via video fingerprinting. The spatial position of the useful frames’ pixels was determined using artificial intelligence and individual frames of 3D textured colonic surface rendered. These frames were then fused into ∼10cm. sections. Last, angular gaps in which one wall of the colon was not seen were calculated as a proportion of total colonic surface of the C-gram section. Seven colonic 10cm. sections from 4 colonoscopies performed by a single endoscopist were reconstructed into the 3D rendering. Missed colonic surface area per section ranged from 0 to 28.6% (Table 1). The mean surface area missed was 9.6% (95% CI 1.2-18.0%). Figure 1 shows missing areas of one reconstructed colonic section. The 3D reconstruction of colonic sections at colonoscopy demonstrated that overall, at least 9.6% of mucosal surface was not visualized at the exam. We aim in the future to additionally calculate gaps in which the proximal surface of the colonic haustra are not seen, gaps due to overlying stool or fluid, and longitudinal gaps during which the endoscope is moved during times of non-visibility. More work is needed to validate the technology and correlate the missed surface area to adenoma detection rate and other clinically relevant measures. This novel technology holds potential to alert endoscopists to missed mucosa and improve adenoma detection, as well as provide an objective measure of individual procedure quality.Tabled 1Missed colon surface area at colonoscopy determined by reconstruction of colonoscopy videoSectionMissing Surface AreaPatient10%A223.5%A30%B43.4%C58.7%C615.9%D715.9%D Open table in a new tab" @default.
- W2807098081 created "2018-06-13" @default.
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- W2807098081 date "2018-06-01" @default.
- W2807098081 modified "2023-10-02" @default.
- W2807098081 title "Sa1930 MISSED COLONIC SURFACE AREA AT COLONOSCOPY CAN BE CALCULATED WITH COMPUTERIZED 3D RECONSTRUCTION" @default.
- W2807098081 doi "https://doi.org/10.1016/j.gie.2018.04.452" @default.
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