title: Assessment of the variability of vocal fold dynamics within and between recordings with high-speed imaging and by phonovibrogram.
abstract: OBJECTIVE
  The goal of the study was to assess the variability of healthy vocal fold dynamics. Quantitative parameters describing mean regularity and vibration characteristics of vocal fold dynamics along the entire glottal axis were analyzed.
  
  
  METHODS
  Prospective study with 14 young healthy females with no history of voice problems. High-speed videoendoscopy was used to capture vocal fold vibratory characteristics while subjects were producing vowel /i/ with comfortable pitch and loudness over three different recording sessions.
  
  
  METHODS
  The analysis of the data was achieved by using the objective image analysis technique, phonovibrography.
  
  
  RESULTS
  The objective analysis of the high-speed video data showed no statistically significant changes in endoscopic voice parameters for normal young female voices.
  
  
  CONCLUSIONS
  Analysis suggests that endoscopic parameters obtained from phonovibrograms are consistent from day to day in normal voices. Further studies are needed to objectively rate the presence and degree of these parameters in disordered voices.
authors.affiliation: Department of Communications Sciences and Disorders, Louisiana State University, Baton Rouge, Louisiana, USA. mkunduk@lsu.edu
authors.forename: Melda
authors.initials: M
authors.lastname: Kunduk
authors.forename: Michael
authors.initials: M
authors.lastname: Doellinger
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: McWhorter
authors.forename: Joerg
authors.initials: J
authors.lastname: Lohscheller
mesh_terms: D000328:Adult; D004867:Equipment Design; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D007828:Laryngoscopy / Q000379:methods*; D010699:Phonation / Q000502:physiology*; D012016:Reference Values; D014732:Vibration; D014741:Video Recording / Q000295:instrumentation*; D014827:Vocal Cords / Q000502:physiology*; D055815:Young Adult