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normative_data_from_in_vivo_kymographic_imaging_in_humans._vocal_fold_vibration_amplitude_open_quotient_and_speed_quotient [2014/03/15 13:16] (current)
bziolko created
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 +Jan G. Švec, Michael Döllinger, Jörg Lohscheller (The Czech Republic, Germany)
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 +**Normative data from in vivo kymographic imaging in humans. Vocal fold vibration amplitude, open quotient and speed quotient**
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 +Institutes: 
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 +1) Palacky University Olomouc, Faculty of Science, Voice Research Lab, Olomouc, Czech Republic
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 +2) Department of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Germany
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 +3) Department of Computer Science, University of Applied Sciences Trier, Germany
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 +Kymographic displaying of laryngoscopic high-speed videos has been recognized as a useful method for analyzing vocal fold vibrations. This study investigates normal variability of vocal fold vibration parameters derived from kymography. 
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 +30 male and 30 female subjects without voice problems were examined by high-speed videolaryngoscopy during sustained phonations at comfortable pitch and loudness. Image processing algorithms were used to derive kymograms and analyze the relative vibration amplitude, open quotient and speed quotient and their variation along the entire glottal length. 
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 +The maximum vibration amplitude of the vocal folds was found to be located at 41.1±10.8% and 46.5± 18.0% of the visible posterior-anterior glottal length in females and males, respectively. The average open quotients decreased in both females and males from posterior to anterior (0.95 to 0.2 and 0.8 to 0.2) reaching the values 0.66±0.14 and 0.56±0.1 in the middle. The speed quotients varied non-monotonically between 1.1 and 0.7 in both females and males showing the values 0.85±0.21 and 0.88±0.28 in the middle.
 +The reported values provide the basis for quantitatively distinguishing pathologic from healthy vocal fold vibrations in clinical practice when aiming at functional diagnosis of voice disorders.
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 +The study was supported by German Research Association (DFG), projects LO1413/2-1 and FOR894/1 in Germany and by the European Social Fund projects no. CZ.1.07/2.4.00/17.0009 and CZ.1.07/2.3.00/20.0057 in the Czech Republic.
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 +Reference: Lohscheller J, Švec JG, Döllinger M: Vocal-fold vibration amplitude, open quotient, speed quotient and their variability along glottal length: Kymographic data from normal subjects. Logoped.Phoniatr.Vocol. 38 (4):182-192, 2013.
  
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