Post-Processing of High-Speed Video-Laryngoscopic Images to Two-Dimensional Scanning Digital Kymographic Images = 초고속 후두내시경 영상을 이용한 평면 스캔 비디오카이모그래피 영상 생성

다국어 초록 (Multilingual Abstract)

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. Results : 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. Conclusion : The post-processing method of converting HSV images to 2D DKG images could provide clinical information and storage economy.

참고문헌 (Reference)

• 1 Gall V, "[Laryngeal photokymography]" 200 : 34-41, 1971
• 2 Larsson H, "Vocal fold vibrations: high-speed imaging, kymography, and acoustic analysis: a preliminary report" 110 : 2117-2122, 2000
• 3 Yamauchi A, "Visualization and Estimation of Vibratory Disturbance in Vocal Fold Scar Using High-Speed Digital Imaging" 30 : 493-500, 2016
• 4 Mendelsohn AH, "The diagnostic role of high-speed vocal fold vibratory imaging" 27 : 627-631, 2013
• 5 Wang SG, "The First Application of the Two-Dimensional Scanning Videokymography in Excised Canine Larynx Model" 30 : 1-4, 2016
• 6 Sataloff RT, "Strobovideolaryngoscopy: results and clinical value" 100 : 725-727, 1991
• 7 Gall V, "Strip kymography of the glottis" 240 : 287-293, 1984
• 8 Jiang JJ, "Quantitative measurement of mucosal wave by high-speed photography in excised larynges" 107 : 98-103, 1998
• 9 Yamauchi A, "Quantitative Analysis of Vocal Fold Vibration in Vocal Fold Paralysis With the Use of High-speed Digital Imaging" 30 : 766 e13-766 e22, 2016
• 10 Yamauchi A, "Quantification of Vocal Fold Vibration in Various Laryngeal Disorders Using High-Speed Digital Imaging" 30 : 205-214, 2016
• 11 Lohscheller J, "Phonovibrography: mapping high-speed movies of vocal fold vibrations into 2-D diagrams for visualizing and analyzing the underlying laryngeal dynamics" 27 : 300-309, 2008
• 12 Yamauchi A, "Phase difference of vocally healthy subjects in high-speed digital imaging analyzed with laryngotopography" 27 : 39-45, 2013
• 13 Svec JG, "Kymographic imaging of laryngeal vibrations" 20 : 458-465, 2012
• 14 Kendall KA, "Introduction to high-speed imaging of the larynx" 13 : 135-137, 2005
• 15 Park HJ, "Imaging and Analysis of Human Vocal Fold Vibration Using Two-Dimensional (2D) Scanning Videokymography" 30 : 345-353, 2016
• 16 Wittenberg T, "Functional imaging of vocal fold vibration: digital multislice high-speed kymography" 14 : 422-442, 2000
• 17 Yamauchi A, "Evaluation of vocal fold vibration with an assessment form for high-speed digital imaging: comparative study between healthy young and elderly subjects" 26 : 742-750, 2012
• 18 Deliyski DD, "Clinical implementation of laryngeal high-speed videoendoscopy: challenges and evolution" 60 : 33-44, 2008
• 19 Yamauchi A, "Characterization of Vocal Fold Vibration in Sulcus Vocalis Using High-Speed Digital Imaging" 60 : 24-37, 2017
• 20 Kunduk M, "Assessment of the variability of vocal fold dynamics within and between recordings with high-speed imaging and by phonovibrogram" 120 : 981-987, 2010