Abstract
Objectives:
Videolaryngostroboscopy, electroglottography, and high-speed video systems are now in use to evaluate vocal cord vibration, which is crucial for voice production. The limitations of videolaryngostroboscopy are 1) the images captured from stroboscopy are not a real vocal cord vibration, and 2) it is difficult to identify each vocal cord mucosal wave in aperiodic dysphonia. The line scanning videokymography was developed to overcome the limitations of stroboscopy, but it only selects one active horizontal line from the whole laryngeal image. The aims of this study are to evaluate the whole laryngeal mucosal wave simultaneously in real time, to overcome the distortions caused by patient movements, to quantify parameters from images using software, and to compare both vocal cord movements and mucosal wave.
Methods:
We developed 2D scanning videokymography using high brightness continuous light source, full HD camera, capture board, and analyzing software. The system makes it possible to observe fundamental frequency, amplitude, regularity, mucosal wave, phase difference, etc.
Results:
We can analyze whole vocal cord movement in real-time and mucosal wave in any area. We can objectively measure specific parameters of vocal cord vibration.
Conclusions:
2D scanning videokymography is a very effective diagnostic tool for aperiodic vocal cord vibration case. It does not require post-processing procedure. 2D scanning videokymography can prevent distortion of images from patient motion resulting from line scanning videokymography.
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