title: Detection of contractions in adaptive transit time of the small bowel from wireless capsule endoscopy videos.
abstract: Recognizing intestinal contractions from wireless capsule endoscopy (WCE) image sequences provides a non-invasive method of measurement, and suggests a solution to the problems of traditional techniques for assessing intestinal motility. Based on the characteristics of contractile patterns and information on their frequencies, the contractions can be investigated using essential image features extracted from WCE videos. In this study, we proposed a coherent three-stage procedure using temporal and spatial features. The possible contractions are recognized by changes in the edge structure of the intestinal folds in Stage 1 and evaluating similarity features in consecutive frames in Stage 2. In order to take account of the properties of contraction frequency, we consider that the possible contractions are located within windows including consecutive frames. The size of these contraction windows is adjusted according to the passage of the WCE. These procedures aim to exclude as many non-contractions as possible. True contractions are determined through spatial analysis of directional information in Stage 3. Using the proposed method, 81% of true contractions are detected with a 37% false alarm rate for evaluations in the experiments. The overall performance of this method is better than that of previous methods, in terms of both the quality and quantity indices. The results suggest feasible data for further clinical applications.
authors.affiliation: Department of Intelligent Media, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Osaka 567-0047, Japan. vhai@am.sanken.osaka-u.ac.jp
authors.forename: Hai
authors.initials: H
authors.lastname: Vu
authors.forename: Tomio
authors.initials: T
authors.lastname: Echigo
authors.forename: Ryusuke
authors.initials: R
authors.lastname: Sagawa
authors.forename: Keiko
authors.initials: K
authors.lastname: Yagi
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Shiba
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Higuchi
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Arakawa
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Yagi
mesh_terms: D000465:Algorithms; D016145:Endoscopy, Digestive System / Q000295:instrumentation*; D005769:Gastrointestinal Motility; D006801:Humans; D007421:Intestine, Small / Q000502:physiology*