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Updated: Jun 8, 2026
06:24
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Published on: January 5, 2024
Air pulse deformation measurement: a preliminary method for noninvasive vocal fold pliability analysis
Hans Larsson1, P Å Lindestad, S Hertegård
1Department of Logopedics and Phoniatrics, Karolinska Institutet, Karolinska University Hospital, Huddinge, Sweden. Hans.Larsson@ki.se
Summary
A novel air pulse pliability measurement technique noninvasively quantifies vocal fold elasticity in vivo. This method offers automatic, quantitative assessments for awake subjects, advancing voice research and clinical applications.
Area of Science:
- Laryngology
- Biomedical Engineering
- Acoustic Science
Background:
- Vocal fold pliability and elasticity are crucial for voice production.
- Existing measurement methods may be invasive or lack quantitative precision.
Purpose of the Study:
- To introduce and validate a new noninvasive technique for measuring vocal fold pliability and elasticity.
- To assess the feasibility of air pulse pliability measurement in vitro and in vivo.
Main Methods:
- Air pulses delivered via a flexible endoscope's working channel.
- Laser-based technique to measure mucosal movements induced by air pulses.
- In vitro and in vivo testing on vocal folds, skin (cheek, hand), and lips of healthy subjects.
Main Results:
- The air pulse pliability measurement technique demonstrated a coefficient of variation of 5% in vitro.
- Elasticity measurements showed no significant differences between vocal folds, lips, or cheeks.
- Skin on the hand exhibited significantly higher stiffness compared to other measured areas (p < 0.001).
Conclusions:
- The air pulse pliability measurement is a viable, automatic, and quantitative noninvasive method.
- This technique enables vocal fold pliability assessment in awake subjects.
- The findings support its potential for clinical and research applications in voice disorders.
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