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Towards a Clinically Applicable Computational Larynx Model
Open AccessArticle

Estimating Vocal Fold Contact Pressure from Raw Laryngeal High-Speed Videoendoscopy Using a Hertz Contact Model

1
Speech, Language & Hearing Department at the Boston University College of Health & Rehabilitation, Sargent College, Boston, MA 02215, USA
2
Department of Electronic Engineering at Universidad Técnica Federico Santa María, Valparaiso 2390123, Chile
3
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
4
Department of Sound at Universidad de Chile, Santiago 8340380, Chile
5
Department of Mechanical Aeronautical Engineering, Clarkson University, Potsdam, NY 13699, USA
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(11), 2384; https://doi.org/10.3390/app9112384
Received: 30 April 2019 / Revised: 31 May 2019 / Accepted: 4 June 2019 / Published: 11 June 2019
(This article belongs to the Special Issue Computational Methods and Engineering Solutions to Voice)
The development of trauma-induced lesions of the vocal folds (VFs) has been linked to a high collision pressure on the VF surface. However, there are no direct methods for the clinical assessment of VF collision, thus limiting the objective assessment of these disorders. In this study, we develop a video processing technique to directly quantify the mechanical impact of the VFs using solely laryngeal kinematic data. The technique is based on an edge tracking framework that estimates the kinematic sequence of each VF edge with a Kalman filter approach and a Hertzian impact model to predict the contact force during the collision. The proposed formulation overcomes several limitations of prior efforts since it uses a more relevant VF contact geometry, it does not require calibrated physical dimensions, it is normalized by the tissue properties, and it applies a correction factor for using a superior view only. The proposed approach is validated against numerical models, silicone vocal fold models, and prior studies. A case study with high-speed videoendoscopy recordings provides initial insights between the sound pressure level and contact pressure. Thus, the proposed method has a high potential in clinical practice and could also be adapted to operate with laryngeal stroboscopic systems. View Full-Text
Keywords: biomechanical modeling; contact pressure, endoscopy; Hertz impact; high-speed video; laryngeal high-speed videoendoscopy; vocal folds; tissue modeling biomechanical modeling; contact pressure, endoscopy; Hertz impact; high-speed video; laryngeal high-speed videoendoscopy; vocal folds; tissue modeling
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MDPI and ACS Style

Díaz-Cádiz, M.E.; Peterson, S.D.; Galindo, G.E.; Espinoza, V.M.; Motie-Shirazi, M.; Erath, B.D.; Zañartu, M. Estimating Vocal Fold Contact Pressure from Raw Laryngeal High-Speed Videoendoscopy Using a Hertz Contact Model. Appl. Sci. 2019, 9, 2384.

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