Mediale Oberflächendynamik an exzidierten Stimmlippen während der Phonation

To increase our understanding of pathological and healthy voice production, quantitative measurement of the medial surface dynamics of the vocal folds is significant. Imaging the medial vocal fold surface allows quantification of mucosal wave dynamics, which achieves its greatest amplitude of vibration in this region. Even though these dynamics are critical for an understanding of voice production, they have been rarely recorded because of the small size and inaccessibility of the larynx. Endoscopic techniques allow only a superior view of the vocal folds. From this perspective, it is impossible to view the medial surface of the vocal folds, where vocal fold opening and closing take place and where sound is generated. Hence, an excised hemilarynx procedure is applied and will be presented, which makes it possible to image and quantify vibrations along the entire medial surface and part of the superior surface of the vocal fold . Reconstructed three-dimensional medial vocal fold surfaces will be shown during phonation. Displacement quantities in longitudinal, horizontal, and vertical direction will be reported, as well as velocity and acceleration values at different points along the medial and superior surface. Variations in the dynamics will be reported as a function of elongation and adductory forces, and subglottal pressure. High-speed digital grayscale imaging was performed using a Photron APX machine with a sampling frequency between 2000Hz and 4000 Hz, and a spatial resolution of at least 512 x 512 pixels