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KMID : 1004320130240020107
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Journal of the Korean Society of Logopedics and Phoniatrics
2013 Volume.24 No. 2 p.107 ~ p.111
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Development of Two-Dimensional Scanning Videokymography for Analysis of Vocal Fold Vibration
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Wang Soo-Geun
Lee Byung-Joo
Lee Jin-Choon
Lim Yun-Sung
Park Young-Min
Park Hee-June
Roh Jung-Hoon
Jeon Gye-Rok
Kwon Soon-Bok
Shin Bum-Joo
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Abstract
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Objectives : We developed two-dimensional (2D) scanning videokyomography to evaluate the mucosal wave of whole vocal cords in real time to overcome the limit of preexisting stroboscopy and line scanning videokymography which could not evaluate it.
Methods : We implemented a continuous light source with high brightness, a high-definition CMOS camera, and capture board for saving the data. We created the software program to analyze the image data from the system. The test of the functionality of the 2D scanning videokymography camera was performed in one of the authors (P.H.J 32 years old male). Vocal cord images were obtained during normal phonation and falsetto phonation. Images were obtained also during cough, diplophonia.
Results : The system made it possible to measure objective parameters, including fundamental frequency, amplitude, regularity, mucosal wave, and phase difference, medial and lateral peak, opening versus closing duration related to vocal fold vibration. Simultaneously, it enabled analysis of the whole mucosal wave of the entire vocal fold in real time. 2D scanning videokymography was also effective for evaluating the dynamic status of the vocal fold when the subject phonated aperiodic voice.
Conclusion : In conclusion, 2D scanning videokymography can support the analysis of the whole mucosal ave of the entire vocal cord with objective vocal parameters, overcoming the limitations of stroboscopy and previous line scanning videokymography techniques.
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KEYWORD
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Videokymography, Vocal fold, Vibration
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