Quantitative Study of Vibrational Symmetry of Injured Vocal Folds Via Digital Kymography in Excised Canine Larynges PurposeDigital kymography and vocal fold curve fitting are blended with detailed symmetry analysis of kymograms to provide a comprehensive characterization of the vibratory properties of injured vocal folds.MethodVocal fold vibration of 12 excised canine larynges was recorded under uninjured, unilaterally injured, and bilaterally injured conditions. Kymograms were created at 25%, ... Article
Article  |   August 01, 2011
Quantitative Study of Vibrational Symmetry of Injured Vocal Folds Via Digital Kymography in Excised Canine Larynges
 
Author Affiliations & Notes
  • Christopher R. Krausert
    University of Wisconsin School of Medicine and Public Health, Madison, WI
    University of Wisconsin School of Medicine and Public Health, Madison, WI
  • Di Ying
    University of Wisconsin School of Medicine and Public Health, Madison, WI
    University of Wisconsin School of Medicine and Public Health, Madison, WI
  • Yu Zhang
    Xiamen University, Xiamen, Fujian, China
    Xiamen University, Xiamen, Fujian, China
  • Jack J. Jiang
    University of Wisconsin School of Medicine and Public Health, Madison, WI
    University of Wisconsin School of Medicine and Public Health, Madison, WI
  • Correspondence to Jack J. Jiang: jjjiang@wisc.edu
  • Editor: Janna Oetting
    Editor: Janna Oetting×
  • Associate Editor: Mahalakshmi Sivasankar
    Associate Editor: Mahalakshmi Sivasankar×
Article Information
Speech, Voice & Prosodic Disorders / Voice Disorders / Speech, Voice & Prosody / Speech
Article   |   August 01, 2011
Quantitative Study of Vibrational Symmetry of Injured Vocal Folds Via Digital Kymography in Excised Canine Larynges
Journal of Speech, Language, and Hearing Research, August 2011, Vol. 54, 1022-1038. doi:10.1044/1092-4388(2010/10-0105)
History: Received April 16, 2010 , Revised September 5, 2010 , Accepted November 23, 2010
 
Journal of Speech, Language, and Hearing Research, August 2011, Vol. 54, 1022-1038. doi:10.1044/1092-4388(2010/10-0105)
History: Received April 16, 2010; Revised September 5, 2010; Accepted November 23, 2010
Web of Science® Times Cited: 9

PurposeDigital kymography and vocal fold curve fitting are blended with detailed symmetry analysis of kymograms to provide a comprehensive characterization of the vibratory properties of injured vocal folds.

MethodVocal fold vibration of 12 excised canine larynges was recorded under uninjured, unilaterally injured, and bilaterally injured conditions. Kymograms were created at 25%, 50%, and 75% of the vocal fold length, and vibratory parameters were compared quantitatively among conditions and were studied with respect to right–left and anterior–posterior symmetries.

ResultsAnterior–posterior amplitude asymmetry was found in the bilateral condition. The unilateral condition showed significant right–left amplitude asymmetry, and it showed the lowest right–left phase symmetry among the conditions. In condition comparisons, vertical phase difference did not show significant differences among conditions, whereas amplitudes were significantly different among conditions at all line scan positions and most vocal fold lips. Significant differences in frequency were found among the conditions at all 4 vocal fold lips, with the bilateral condition exhibiting the greatest frequency.

ConclusionDigital kymography and curve fitting provide detailed information about the vibratory behavior of injured vocal folds. Awareness of vibratory properties associated with vocal fold injury may aid in diagnosis, and the quantitative abilities of digital kymography may allow for objective treatment selection.

Acknowledgments
This research was supported by National Institute on Deafness and Other Communication Disorders Grants R01 DC008850 and R01 DC05522.
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