title: Analysis of surface geometry of the human stomach using real-time 3-D ultrasonography in vivo.
abstract: The objective of this study was to develop an analytical method to describe the three-dimensional (3-D) geometry of the gastric antrum, gastric fundus and the whole stomach. The Fourier series method was used to simulate the organ surface geometry obtained from a 3-D ultrasound system. Data generated from eight antrums and three whole stomachs, at pressures of approximately 7 cm H(2)O, were used for lumen curvature calculations. The principal curvatures spatial distributions were non-homogeneous in the gastric antrum, gastric fundus and the stomach due to their complex geometry. The maximum longitudinal principal curvature in the antrum, fundus and total stomach were, respectively, 0.460 +/- 0.066, 0.583 +/- 0.087 and 1.123 +/- 0.328, whereas the maximum circumferential curvature were 1.192 +/- 0.090, 3.649 +/- 1.574 and 8.444 +/- 3.424, respectively. The present study provides an analytical tool for characterizing the complex 3-D geometry of an organ-like the human stomach reconstructed by clinical imaging modalities. Providing an average tension for the stomach does not reflect the large variation in tension throughout the stomach wall.
authors.affiliation: Center of Excellence in Visceral Biomechanics and Pain, Aalborg Hospital and Institute of Health Technology, Aalborg University, Aalborg, Denmark.
authors.forename: D
authors.initials: D
authors.lastname: Liao
authors.forename: H
authors.initials: H
authors.lastname: Gregersen
authors.forename: T
authors.initials: T
authors.lastname: Hausken
authors.forename: O H
authors.initials: OH
authors.lastname: Gilja
authors.forename: M
authors.initials: M
authors.lastname: Mundt
authors.forename: G
authors.initials: G
authors.lastname: Kassab
mesh_terms: D000328:Adult; D000465:Algorithms; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D013270:Stomach / Q000033:anatomy & histology*; D014463:Ultrasonography