Development of Two-Dimensional Scanning Videokymography for Analysis of Vocal Fold Vibration

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

J Korean Soc Laryngol Phoniatr Logop > Volume 24(2); 2013 > Article

Journal of The Korean Society of Laryngology, Phoniatrics and Logopedics 2013;24(2): 107-111.

Soo-Geun Wang¹, Byung-Joo Lee¹, Jin-Choon Lee¹, Yun-Sung Lim¹, Young Min Park¹, Hee-June Park¹, Jung-Hoon Roh², Gye-Rok Jeon², Soon-Bok Kwon³, Bum-Joo Shin⁴

¹Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University School of Medicine and Biomedical Research Institute, Pusan National University
²Department of Biomedical Engineering, Pusan National University
³Language and Information, Pusan National University
⁴Applied IT and Engineering, College of Natural Resource and Life Science, Pusan National University

ABSTRACT

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 wave of the entire vocal cord with objective vocal parameters, overcoming the limitations of stroboscopy and previous line scanning videokymography techniques.

KEY WORDS： Videokymography;Vocal fold;Vibration;