Gaze patterns hold key to unlocking successful search strategies and increasing polyp detection rate in colonoscopy

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Title: Gaze patterns hold key to unlocking successful search strategies and increasing polyp detection rate in colonoscopy
Author(s): Lami, M
Singh, H
Dilley, JH
Ashraf, H
Edmondon, M
Orihuela-Espina, F
Hoare, J
Darzi, A
Sodergren, MH
Item Type: Journal Article
Abstract: BACKGROUND:  The adenoma detection rate (ADR) is an important quality indicator in colonoscopy. The aim of this study was to evaluate the changes in visual gaze patterns (VGPs) with increasing polyp detection rate (PDR), a surrogate marker of ADR. METHODS:  18 endoscopists participated in the study. VGPs were measured using eye-tracking technology during the withdrawal phase of colonoscopy. VGPs were characterized using two analyses - screen and anatomy. Eye-tracking parameters were used to characterize performance, which was further substantiated using hidden Markov model (HMM) analysis. RESULTS:  Subjects with higher PDRs spent more time viewing the outer ring of the 3 × 3 grid for both analyses (screen-based: r = 0.56, P = 0.02; anatomy: r = 0.62, P < 0.01). Fixation distribution to the "bottom U" of the screen in screen-based analysis was positively correlated with PDR (r = 0.62, P = 0.01). HMM demarcated the VGPs into three PDR groups. CONCLUSION:  This study defined distinct VGPs that are associated with expert behavior. These data may allow introduction of visual gaze training within structured training programs, and have implications for adoption in higher-level assessment.
Publication Date: 1-Jul-2018
Date of Acceptance: 4-Dec-2017
ISSN: 1438-8812
Publisher: Thieme Publishing
Start Page: 701
End Page: 707
Journal / Book Title: Endoscopy
Volume: 50
Issue: 07
Sponsor/Funder: The Academy of Medical Sciences
Funder's Grant Number: n/a
Copyright Statement: © Georg Thieme Verlag KG Stuttgart · New York
Keywords: Science & Technology
Life Sciences & Biomedicine
Gastroenterology & Hepatology
1103 Clinical Sciences
Gastroenterology & Hepatology
Publication Status: Published
Online Publication Date: 2018-02-07
Appears in Collections:Division of Surgery
Faculty of Medicine

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