3D visualization and analysis of vocal fold dynamics

Visual investigation methods of the larynx mainly allow for the two-dimensional presentation of the three-dimensional structures of the vocal fold dynamics. The vertical component of the vocal fold dynamics is often neglected, yielding a loss of information. The latest studies show that the vertical...

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Bibliographic Details
Published in:HNO 2016-04, Vol.64 (4), p.254-261
Main Authors: Bohr, C, Döllinger, M, Kniesburges, S, Traxdorf, M
Format: Article
Language:ger
Subjects:
Equipment Design
Equipment Failure Analysis
Humans
Imaging, Three-Dimensional - instrumentation
In Vitro Techniques
Laryngoscopes
Lasers
Male
Reproducibility of Results
Sensitivity and Specificity
Signal Processing, Computer-Assisted - instrumentation
Speech Production Measurement - instrumentation
Speech Production Measurement - methods
Video Recording - instrumentation
Vocal Cords - anatomy & histology
Vocal Cords - physiology
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Summary:Visual investigation methods of the larynx mainly allow for the two-dimensional presentation of the three-dimensional structures of the vocal fold dynamics. The vertical component of the vocal fold dynamics is often neglected, yielding a loss of information. The latest studies show that the vertical dynamic components are in the range of the medio-lateral dynamics and play a significant role within the phonation process. This work presents a method for future 3D reconstruction and visualization of endoscopically recorded vocal fold dynamics. The setup contains a high-speed camera (HSC) and a laser projection system (LPS). The LPS projects a regular grid on the vocal fold surfaces and in combination with the HSC allows a three-dimensional reconstruction of the vocal fold surface. Hence, quantitative information on displacements and velocities can be provided. The applicability of the method is presented for one ex-vivo human larynx, one ex-vivo porcine larynx and one synthetic silicone larynx. The setup introduced allows the reconstruction of the entire visible vocal fold surfaces for each oscillation status. This enables a detailed analysis of the three dimensional dynamics (i. e. displacements, velocities, accelerations) of the vocal folds. The next goal is the miniaturization of the LPS to allow clinical in-vivo analysis in humans. We anticipate new insight on dependencies between 3D dynamic behavior and the quality of the acoustic outcome for healthy and disordered phonation.
ISSN:1433-0458
DOI:10.1007/s00106-016-0122-1