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Post-processing of high-speed video-laryngoscopic images to two-dimensional scanning digital kymographic images
Soo-Geun Wang1, Wonjae Cha1, Jeon Yeob Jang2, Geun-Hyo Kim1, Yeon-Woo Lee1
1Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University School of Medicine, Busan, Korea
2Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea , Suwon, Korea
Correspondence  Soo-Geun Wang ,Tel: 82-51-240-7336, Fax: 82-51-246-8668, Email: entwangsg@gmail.com
Received: 14 October 2017;  Accepted: 23 November 2017.  Published online: 23 November 2017.
Introduction: Ultimately, high-speed videolaryngoscopy (HSV) is the only technique that captures the true intra-cycle vibratory behavior of the vocal folds by capturing a full image of the vocal folds. However, problems associated with HSV include a lack of immediate feedback during examination, considerable waiting time before digital kymographic visualization, a recording duration limited to a few seconds, and extreme demands for storage space. In this study, 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).
A healthy 34-year-old man with no history of laryngeal disorders or surgery participated in this study. HSV system was used to capture images of the subject’s vocal folds. The HSV images were post-processed in Kay image process software (KIPS), and the conventional DKG images were retrieved. And, a custom-made post-processing system was used to convert HSV images to 2D DKG images. Validation of the quantitative parameters of the post-processed 2D DKG images was performed by comparing these parameters with those of the DKG images. Ten cycles each of vocal fold vibration were analyzed using both conventional DKG and 2D DKG images.
The 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, the post-processed 2D DKG image from the HSV image can provide quantitative information on vocal fold mucosa vibration, including the various vibratory phases. Differences
KEY WORDS: vocal fold vibration; high-speed image; two-dimensional scanning digital kymography; image post-processing; voice
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