Hee-June Park1, Wonjae Cha2, Geun-Hyo Kim2, Gye-Rok Jeon3, Byung Joo Lee4, Bum-Joo Shin5, Yang-Gyu Choi6, Soo-Geun Wang7. 1. Department of Biomedical Engineering, School of Medicine, Pusan National University, Yang-san, Gyeongsangnam-do, South Korea; Department of Speech Rehabilitation, Choonhae College of Health Sciences, Ulsan, South Korea. 2. Department of Otorhinolaryngology and Head and Neck Surgery and Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea. 3. Department of Biomedical Engineering, School of Medicine, Pusan National University, Yang-san, Gyeongsangnam-do, South Korea. 4. Department of Otolaryngology, School of Medicine, Pusan National University, Yang-san, Gyeongsangnam-do, South Korea. 5. Department of Applied IT and Engineering, Pusan National University, Miryang, Gyeongsangnam-do, South Korea. 6. Department of Language Therapy, Daegu University, Daegu, South Korea. 7. Department of Otolaryngology, School of Medicine, Pusan National University, Yang-san, Gyeongsangnam-do, South Korea. Electronic address: wangsg@pusan.ac.kr.
Abstract
OBJECTIVE: Laryngeal videokymography and high-speed digital kymography are the currently available techniques for studying aperiodic vibration of the vocal folds. However, videokymography has a fundamental limitation that only linear portions of the vocal fold mucosa can be visualized, whereas high-speed digital kymography has the disadvantages of lack of immediate feedback during examination and considerable waiting time before kymographic visualization. We developed a new system, two-dimensional (2D) scanning videokymography, that provides a possible alternative for evaluation of the vibratory pattern of the vocal folds. Herein, we report the application of 2D scanning videokymography for visualization of vocal fold vibration in humans and an analysis of its parameters. MATERIALS AND METHODS: Two young healthy volunteers (one man and one woman) took part in this study. The vibratory patterns of their vocal folds were evaluated using 2D scanning videokymography and laryngeal stroboscopy. RESULTS: Two-dimensional scanning videokymography provided a high-definition image of the vibratory movements of the vocal folds. In analysis of the images acquired by the device, various parameters including fundamental frequency; ratio of the vibratory phases; phase, amplitude, and glottal area symmetry; and cycle-to-cycle variability were extracted. CONCLUSIONS: Our results indicate that 2D scanning videokymography is a useful and promising tool for visualization of the vibratory movement of the vocal folds. This new technique might improve our understanding of the mechanism of vocal fold vibration and contribute to voice research as well as clinical practice.
OBJECTIVE: Laryngeal videokymography and high-speed digital kymography are the currently available techniques for studying aperiodic vibration of the vocal folds. However, videokymography has a fundamental limitation that only linear portions of the vocal fold mucosa can be visualized, whereas high-speed digital kymography has the disadvantages of lack of immediate feedback during examination and considerable waiting time before kymographic visualization. We developed a new system, two-dimensional (2D) scanning videokymography, that provides a possible alternative for evaluation of the vibratory pattern of the vocal folds. Herein, we report the application of 2D scanning videokymography for visualization of vocal fold vibration in humans and an analysis of its parameters. MATERIALS AND METHODS: Two young healthy volunteers (one man and one woman) took part in this study. The vibratory patterns of their vocal folds were evaluated using 2D scanning videokymography and laryngeal stroboscopy. RESULTS: Two-dimensional scanning videokymography provided a high-definition image of the vibratory movements of the vocal folds. In analysis of the images acquired by the device, various parameters including fundamental frequency; ratio of the vibratory phases; phase, amplitude, and glottal area symmetry; and cycle-to-cycle variability were extracted. CONCLUSIONS: Our results indicate that 2D scanning videokymography is a useful and promising tool for visualization of the vibratory movement of the vocal folds. This new technique might improve our understanding of the mechanism of vocal fold vibration and contribute to voice research as well as clinical practice.
Authors: Giriraj K Sharma; Lily Y Chen; Lidek Chou; Christopher Badger; Ellen Hong; Swathi Rangarajan; Theodore H Chang; William B Armstrong; Sunil P Verma; Zhongping Chen; Ram Ramalingam; Brian J-F Wong Journal: J Biomed Opt Date: 2021-08 Impact factor: 3.170