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Quantifying Vocal Fold Vibration in the Coronal Plane Using Optical Coherence Tomography in Normal Human Subjects.

Diego E Razura1, Anna M Wisniowiecki2, Zhaoyan Zhang3

  • 1Caruso Department of Otolaryngology-Head & Neck Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, California.

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Summary

Optical coherence tomography (OCT) successfully visualized vocal fold (VF) subsurface anatomy and vibration in healthy individuals. This technique enables quantitative assessment of VF biomechanics, revealing gender-specific vibratory differences.

Keywords:
GenderLaryngoscopyOptical coherence tomographyVocal fold vibrationVoice assessmentVoice biomechanics

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Area of Science:

  • Biomedical Engineering
  • Otolaryngology
  • Medical Imaging

Background:

  • Current assessment of vocal fold (VF) morphology and vibration relies on surface visualization, primarily laryngeal videostroboscopy.
  • There is a need for quantitative methods to assess VF biomechanics beyond surface observations.

Purpose of the Study:

  • To measure VF vibratory dynamics in the coronal plane using optical coherence tomography (OCT) in healthy volunteers.
  • To support a quantitative assessment of vocal fold biomechanics through novel imaging techniques.

Main Methods:

  • A cross-sectional observational pilot study involving twelve healthy participants.
  • Awake, transoral imaging using a custom-built, hand-held rigid laryngoscope with OCT technology.
  • Phonation captured during sustained /i/ vowel production; a novel algorithm reconstructed phase-resolved VF vibratory cycles and extracted seven dynamic metrics (CQ, AaC, DPVT, CPVS, mucosal peak, amplitude, VPD).

Main Results:

  • Seven novel metrics were successfully extracted from OCT data in all subjects.
  • Significant gender differences were observed for divergent phase vertical thickness (DPVT), amplitude, and vertical phase difference (VPD).
  • Correlation analyses revealed significant relationships between metrics, such as positive correlation between DPVT and closed phase vertical span (CPVS).

Conclusions:

  • Optical coherence tomography (OCT) imaging of vocal folds during phonation is feasible in healthy subjects.
  • OCT enables visualization of sub-surface VF anatomy and vibration, providing quantitative characterization of VF dynamics.
  • This technique offers a promising approach for objective assessment of vocal fold biomechanics.