This paper described evaluation of the three-dimensional endoscope system for assessing the gastrointestinal motility.
Gastrointestinal diseases are mainly based on the morphological or anatomical abnormity. However, sometimes the gastrointestinal
symptoms are apparent without visible abnormalities. Such diseases are called functional gastrointestinal
disorder, for example, functional dyspepsia, and irritable bowel syndrome. One of the major factors of these diseases is
the gastrointestinal dysmotility. Assessment procedures for motor function are either invasive, or indirect. We thus propose
a three-dimensional endoscope system for assessing the gastrointestinal motility. To assess the dynamic motility of
the stomach, three-dimensional endoscopic imaging of stomach lining is performed. Propagating contraction waves are
detected by subtracting estimated stomach geometry without contraction waves from one with contraction waves. After
detecting constriction waves, their frequency, amplitude, and speed of propagation can be calculated. In this study, we
evaluate the proposed system. First, we evaluate the developed three-dimensional endoscope system by a flat plane. This
system can measure the geometry of the flat plane with an error of less than 10 percent of the distance between endoscope
tip and the object. Then we confirm the validity of a prototype system by a wave simulated model. The detected wave is
approximated by a Gaussian function. In the experiment, the amplitude and position of the wave can be measure with 1
mm accuracy. These results suggest that the proposed system can measure the speed and amplitude of contraction. In the
future, we evaluate the proposed system in vivo experiments.