title: [3D visualization and analysis of vocal fold dynamics].
abstract: BACKGROUND
  Visual investigation methods of the larynx mainly allow for the two-dimensional presentation of the three-dimensional structures of the vocal fold dynamics. The vertical component of the vocal fold dynamics is often neglected, yielding a loss of information. The latest studies show that the vertical dynamic components are in the range of the medio-lateral dynamics and play a significant role within the phonation process.
  
  
  OBJECTIVE
  This work presents a method for future 3D reconstruction and visualization of endoscopically recorded vocal fold dynamics.
  
  
  METHODS
  The setup contains a high-speed camera (HSC) and a laser projection system (LPS). The LPS projects a regular grid on the vocal fold surfaces and in combination with the HSC allows a three-dimensional reconstruction of the vocal fold surface. Hence, quantitative information on displacements and velocities can be provided. The applicability of the method is presented for one ex-vivo human larynx, one ex-vivo porcine larynx and one synthetic silicone larynx.
  
  
  RESULTS
  The setup introduced allows the reconstruction of the entire visible vocal fold surfaces for each oscillation status. This enables a detailed analysis of the three dimensional dynamics (i. e. displacements, velocities, accelerations) of the vocal folds.
  
  
  CONCLUSIONS
  The next goal is the miniaturization of the LPS to allow clinical in-vivo analysis in humans. We anticipate new insight on dependencies between 3D dynamic behavior and the quality of the acoustic outcome for healthy and disordered phonation.
authors: Abteilung für Phoniatrie und Pädaudiologie an der Hals-Nasen-Ohren-Klinik, Kopf- und Halschirurgie, Universitätsklinikum Erlangen, Bohlenplatz 21, 91054, Erlangen, Deutschland. christopher.bohr@uk-erlangen.de.
authors: C
authors: C
authors: Bohr
authors: Abteilung für Phoniatrie und Pädaudiologie an der Hals-Nasen-Ohren-Klinik, Kopf- und Halschirurgie, Universitätsklinikum Erlangen, Bohlenplatz 21, 91054, Erlangen, Deutschland.
authors: M
authors: M
authors: Döllinger
authors: Abteilung für Phoniatrie und Pädaudiologie an der Hals-Nasen-Ohren-Klinik, Kopf- und Halschirurgie, Universitätsklinikum Erlangen, Bohlenplatz 21, 91054, Erlangen, Deutschland.
authors: S
authors: S
authors: Kniesburges
authors: Hals-Nasen-Ohren-Klinik, Kopf- und Halschirurgie, Universitätsklinikum Erlangen, Erlangen, Deutschland.
authors: M
authors: M
authors: Traxdorf
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D066298:In Vitro Techniques; D020704:Laryngoscopes; D007834:Lasers; D008297:Male; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D013068:Speech Production Measurement / Q000295:instrumentation* / Q000379:methods; D014741:Video Recording / Q000295:instrumentation*; D014827:Vocal Cords / Q000033:anatomy & histology* / Q000502:physiology*
keywords: 3D surface reconstruction; High speed imaging; Laser projection system; Vocal folds; Voice diagnostic