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Vocal fold impact stress analysis.

J J Jiang1, A G Shah, M M Hess

  • 1Department of Otolaryngology-Head and Neck Surgery, Northwestern University Medical School, Chicago, Illinois 60611, USA. jjiang@nwu.edu

Journal of Voice : Official Journal of the Voice Foundation
|September 25, 2002
PubMed
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Vocal fold impact stress, a factor in vocal fold lesions, can be estimated noninvasively. The second derivative of photoglottography (PGG) measurements showed a linear relationship with impact stress in canine larynges.

Area of Science:

  • Laryngology
  • Bioacoustics
  • Biomechanics

Background:

  • Vocal fold impact stress is a potential cause of vocal fold nodules and polyps.
  • Impact force is related to acceleration, assuming constant vocal fold mass.
  • Photoglottography (PGG) measures vocal fold displacement, allowing calculation of velocity and acceleration.

Purpose of the Study:

  • To compare the second derivative of the PGG signal with simultaneously measured impact stress.
  • To investigate the potential of PGG as a noninvasive method for estimating vocal fold impact stress.

Main Methods:

  • Excised canine larynx model used for experimentation.
  • Glottal transillumination (PGG) measured via a subglottic transducer.
  • Impact stress measured using a miniature force transducer placed between the vocal folds.

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Main Results:

  • A positive and linear relationship was observed between the second derivative of PGG and impact stress.
  • Results were statistically significant across nine different larynges.
  • The findings support the hypothesis that PGG can estimate relative vocal fold impact stress.

Conclusions:

  • The second derivative of PGG offers a useful noninvasive method for estimating relative vocal fold impact stress.
  • This technique may aid in understanding and potentially preventing vocal fold pathologies related to impact stress.