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J Korean Soc Laryngol Phoniatr Logop > Volume 28(2); 2017 > Article
Journal of The Korean Society of Laryngology, Phoniatrics and Logopedics 2017;28(2): 89-95.
doi: https://doi.org/10.22469/jkslp.2017.28.2.89
초고속 후두내시경 영상을 이용한 평면 스캔 비디오카이모그래피 영상 생성
차원재1,2, 왕수건2,3, 장전엽4, 김근효1, 이연우1
1부산대학교병원 이비인후과, 의생명연구원
2부산대학교 의학전문대학원 이비인후과학교실
4아주대학교 의학전문대학원 이비인후과학교실
Post-Processing of High-Speed Video-Laryngoscopic Images to Two-Dimensional Scanning Digital Kymographic Images
Wonjae Cha1,2, Soo-Geun Wang2,3, Jeon Yeob Jang4, Geun-Hyo Kim1, Yeon-Woo Lee1
1Department of Otorhinolaryngology-Head and Neck Surgery and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
2Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University School of Medicine, Yangsan , Korea
3U-Medical Co., Ltd, Busan, Korea
4Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
Correspondence  Soo-Geun Wang ,Tel: (051) 240-7336, Fax: (051) 246-8668, Email: entwangsg@gmail.com
Received: 14 October 2017; Revised: November 7, 2017   Accepted: 23 November 2017.  Published online: 31 December 2017.
Background and Objectives
High-speed videolaryngoscopy (HSV) is the only technique that captures the true intra-cycle vibratory behavior of the vocal folds by capturing full images of the vocal folds. However, it has problems of no immediate feedback during examination, considerable waiting time for digital kymography (DKG), recording duration limited to a few seconds, and extreme demands for storage space. Herein, we demonstrate a new post-processing method that converts HSV images to two-dimensional digital kymography (2D-DKG) images, which adopts the algorithm of 2D videokymography (2D VKG).
Materials and Methods
HSV system was used to capture images of vocal folds. HSV images were post-processed in Kay image-process software (KIPS), and conventional DKG images were retrieved. Custom-made post-processing system was used to convert HSV images to 2D-DKG images. The quantitative parameters of the post-processed 2D-DKG images was validated by comparing these parameters with those of the DKG images.
Serial HSV images for all phases of vocal fold vibratory movement are included. The images were converted by the scanning method using U-medical image-process software. Similar to conventional DKG, post-processed 2D DKG image from the HSV image can provide quantitative information on vocal fold mucosa vibration, including the various vibratory phases. Differences in amplitude symmetry index, phase symmetry index, open quotient, and close quotient between 2D-DKG and DKG were analyzed. There were no statistical differences between the quantitative parameters of vocal fold vibratory movement in 2D-DKG and DKG.
The post-processing method of converting HSV images to 2D DKG images could provide clinical information and storage economy.
KEY WORDS: Vocal fold vibrationHigh-speed imageTwo-dimensional scanning digital kymography Image post-processingVoice
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