An Automated Method for Quantification of Two Dimensional Videokymography and Its Usefulness

다국어 초록 (Multilingual Abstract)

Purpose : Vibration of the vocal cords is an essential part of voice production. A method for quantifying vibration is essential for the detection, diagnosis, and treatment of various voice disorders. The present study offers an automatic quantitative method to describe vibration properties and analyzes its clinical usefulness in evaluating pathological vocal cords via two-dimensional videokymography (2D VKG).
Methods : The proposed method is based on image processing, which combines an active contour model with a genetic algorithm to improve the accuracy of detection and processing speed. It can accurately extract the vibration wave in two-dimensional videokymograms. The extracted 2D VKG information can be automatically converted into objective values in terms of five parameters (fundamental frequency [F0], open quotient [OQ], closed quotient [CQ], phase symmetry index [PSI], and amplitude symmetry index [ASI]). We compared the recovery of the vocal cords in a 52-year-old male with acute laryngitis by performing 2D VKG at 1, 3, and 4 weeks.
Results : F0 was not measurable at 1 week. After 4 weeks, it could be measured (117.24 Hz) after vocal cord vibration was observed. CQ, which reflects the degree of vocal cord contact, increased from 38% to 44%, while OQ decreased from 62% to 56%. PSI, which shows the regularity of the vocal cords, decreased from 0.148 to 0.72, while ASI decreased from 0.175 to 0.081.
Conclusions : The method used in this study allows easy analysis of vibratory parameters and quantifies mucosal wave parameters of vocal cord vibrations. Presenting the state of vocal cord vibration as a numerical value may increase clinical utility, as it is possible to compare the recovery of the vocal cords objectively.

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