title: Gastric Contraction Imaging System Using a 3-D Endoscope.
abstract: This paper presents a gastric contraction imaging system for assessment of gastric motility using a 3-D endoscope. Gastrointestinal diseases are mainly based on morphological abnormalities. However, gastrointestinal symptoms are sometimes apparent without visible abnormalities. One of the major factors for these diseases is abnormal gastrointestinal motility. For assessment of gastric motility, a gastric motility imaging system is needed. To assess the dynamic motility of the stomach, the proposed system measures 3-D gastric contractions derived from a 3-D profile of the stomach wall obtained with a developed 3-D endoscope. After obtaining contraction waves, their frequency, amplitude, and speed of propagation can be calculated using a Gaussian function. The proposed system was evaluated for 3-D measurements of several objects with known geometries. The results showed that the surface profiles could be obtained with an error of [Formula: see text] of the distance between two different points on images. Subsequently, we evaluated the validity of a prototype system using a wave simulated model. In the experiment, the amplitude and position of waves could be measured with 1-mm accuracy. The present results suggest that the proposed system can measure the speed and amplitude of contractions. This system has low invasiveness and can assess the motility of the stomach wall directly in a 3-D manner. Our method can be used for examination of gastric morphological and functional abnormalities.
authors.affiliation: Osaka University Division of Health Sciences Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Kayo
authors.initials: K
authors.lastname: Yoshimoto
authors.affiliation: Osaka University Division of Health Sciences Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Kenji
authors.initials: K
authors.lastname: Yamada
authors.affiliation: Osaka University Department of Gastroenterology and Hepatology Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Kenji
authors.initials: K
authors.lastname: Watabe
authors.affiliation: Osaka University Division of Health Sciences Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Maki
authors.initials: M
authors.lastname: Takeda
authors.affiliation: Osaka University Division of Health Sciences Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nishimura
authors.affiliation: Osaka University Division of Health Sciences Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Michiko
authors.initials: M
authors.lastname: Kido
authors.affiliation: Osaka Electro-Communication University Department of Biomedical Engineering Graduate School of Biomedical Engineering Osaka Japan 575-0063.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Nagakura
authors.affiliation: Osaka University Division of Health Sciences Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Hideya
authors.initials: H
authors.lastname: Takahashi
authors.affiliation: Osaka University Department of Gastroenterology and Hepatology Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nishida
authors.affiliation: Osaka University Department of Gastroenterology and Hepatology Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Hideki
authors.initials: H
authors.lastname: Iijima
authors.affiliation: Osaka University Department of Gastroenterology and Hepatology Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Tsujii
authors.affiliation: Osaka University Department of Gastroenterology and Hepatology Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Takehara
authors.affiliation: Osaka University Division of Health Sciences Graduate School of Medicine Osaka Japan 565-0871.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Ohno
keywords: Endoscopes; gastric contraction; gastric motility; gastroenterology