Near real-time retroflexion detection in colonoscopy

Yi Wang, Wallapak Tavanapong, Johnny Wong, Jung Hwan Oh, Piet C. De Groen

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Colonoscopy is the most popular screening tool for colorectal cancer. Recent studies reported that retroflexion during colonoscopy helped to detect more polyps. Retroflexion is an endoscope maneuver that enables visualization of internal mucosa along the shaft of the endoscope, enabling visualization of the mucosa area that is difficult to see with typical forward viewing. This paper describes our new method that detects retroflexion during colonoscopy. We propose region shape and location (RSL) features and edgeless edge cross-section profile (ECSP) features that encapsulate important properties of endoscope appearance and edge information during retroflexion. Our experimental results on 50 colonoscopy test videos show that a simple ensemble classifier using both ECSP and RSL features can effectively identify retroflexion in terms of analysis time and detection rate.

Original languageEnglish (US)
Pages (from-to)143-152
Number of pages10
JournalIEEE Journal of Biomedical and Health Informatics
Issue number1
StatePublished - 2013


  • Colonoscopy
  • Edge cross-section profile (ECSP)
  • Medical image analysis
  • Retroflexion detection


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