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Year: 2013  Vol. 17   Num. Suppl. 1  - Print:
HIGH-SPEED VIDEOLARYNGOSCOPY: ANALYSIS OF THE VOCAL FOLD DURING VOCAL FRY
Author(s):
Regina Aparecida Pimenta, Arlindo Neto Montagnoli, Domingos Hiroshi Tsuji, Gislaine Ferro Cordeiro, Mara Eugenia Djer, Monike Tsutsumi
Abstract:

PURPOSE: To compare the vibration pattern of the vocal fold during vocal fry with modal phonation using high-speed videolaryngoscopy (HSV). METHODS: HSV images were recorded during conventional sustained emission of vogal /e/ and vocal fry by a 34-year-old female volunteer with no vocal or laryngeal complaints. The images were sampled at 4000 frames/second and processed using 2 computational methods. The first was frame-to-frame laryngeal segmentation of 5 glottal pulses. We calculated the phase time for the closed (CPh), opened (OPh), closing (cPh), and opening (oPh) phases. We also calculated the fundamental frequency (F0). The second method used was high-speed videokymography, which was performed by capturing and juxtaposing frames using 10 glottal cycles, and calculating the mean (X) and standard deviation (SD). When modal phonation and vocal fry were compared, discrepancies were noted in CPh and F0 (Segmentation, Vocal Fry: X = 11.60 ms, SD =3.16 for CPh and X = 81.05 Hz, SD = 24.84 for F0. Modal: X = 1.30 ms, SD = 0.11 for CPh and X = 200.00 Hz, SD = 0.00 for F0; Kymography, Vocal Fry: X = 75.20 ms, SD = 2.10 for CPh and X = 113.32 Hz, SD = 2.96 for F0. Modal: X = 18.50 ms, SD = 1.30 for CPh and X = 240.11Hz, SD = 8.83 for F0). CONCLUSION: The fundamental frequency influences the vocal fold vibration pattern. Lower frequency vocal fry increases the closed phase time of the glottal cycle during emission. This exercise can promote glottal coaptation.

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