title: Asymmetric spatiotemporal chaos induced by a polypoid mass in the excised larynx.
abstract: In this paper, asymmetric spatiotemporal chaos induced by a polypoid mass simulating the laryngeal pathology of a vocal polyp is experimentally observed using high-speed imaging in an excised larynx. Spatiotemporal analysis reveals that the normal vocal folds show spatiotemporal correlation and symmetry. Normal vocal fold vibrations are dominated mainly by the first vibratory eigenmode. However, pathological vocal folds with a polypoid mass show broken symmetry and spatiotemporal irregularity. The spatial correlation is decreased. The pathological vocal folds spread vibratory energy across a large number of eigenmodes and induce asymmetric spatiotemporal chaos. High-order eigenmodes show complicated dynamics. Spatiotemporal analysis provides a valuable biomedical application for investigating the spatiotemporal chaotic dynamics of pathological vocal fold systems with a polypoid mass and may represent a valuable clinical tool for the detection of laryngeal mass lesion using high-speed imaging.
authors.affiliation: Department of Surgery, Division of Otolaryngology Head and Neck Surgery, University of Wisconsin Medical School, Madison, Wisconsin 53792-7375, USA. Zhang@surgery.wisc.edu
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jack J
authors.initials: JJ
authors.lastname: Jiang
mesh_terms: D000818:Animals; D003198:Computer Simulation; D004285:Dogs; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007818:Laryngeal Diseases / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D007830:Larynx / Q000473:pathology / Q000503:physiopathology*; D008954:Models, Biological; D017711:Nonlinear Dynamics; D009991:Oscillometry / Q000379:methods*; D011127:Polyps; D014832:Voice Disorders / Q000209:etiology / Q000473:pathology / Q000503:physiopathology*