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J Voice ; 31(2): 247.e1-247.e7, 2017 Mar.
Article in English | MEDLINE | ID: mdl-27839706

ABSTRACT

INTRODUCTION: For the evaluation of voice disorders, direct observation of vocal cord vibration is important. Among the various methods, laryngeal videostroboscopy (LVS) is widely used, but it was not a true image because it collects images from different cycles. In contrast, high-speed videoendoscopy and videokymography have much higher frame rates and can assess functional and mobility disorders. OBJECTIVE: The purpose of the study is to describe real-time, simultaneous digital kymography (DKG), two-dimensional scanning (2D) DKG, and multi-frame (MF) LVS system using a high-speed digital camera, and identify the efficacy of this system in evaluating vibratory patterns of pathologic voice. METHODS: The pattern of vocal fold vibration was evaluated in a vocally healthy subject and in subjects with vocal polyp, vocal nodules, vocal cord scar, and vocal cord paralysis. We used both quantitative (left-right phase symmetry, amplitude symmetry index) and qualitative (anterior-posterior phase symmetry) parameters for assessment of vocal fold vibration. RESULTS: Our system could record videos within seconds and required relatively little memory. The speed of replay in the DKG, 2D DKG, MF LVS, and high-speed videoendoscopy was controllable. The number of frame per cycle with MF LVS was almost the same as the fundamental frequency. CONCLUSION: Our system can provide images of various modalities simultaneously in real time and analyze morphological and functional vibratory patterns. It can be possible to provide a greater level of information for the diagnosis and treatment of vibratory disorders.


Subject(s)
Cicatrix/diagnostic imaging , Kymography/instrumentation , Laryngeal Diseases/diagnostic imaging , Laryngoscopy/instrumentation , Phonation , Polyps/diagnostic imaging , Stroboscopy/instrumentation , Video Recording/instrumentation , Vocal Cord Paralysis/diagnostic imaging , Vocal Cords/diagnostic imaging , Adult , Aged , Biomechanical Phenomena , Case-Control Studies , Cicatrix/physiopathology , Equipment Design , Female , Humans , Judgment , Kymography/methods , Laryngeal Diseases/physiopathology , Laryngoscopy/methods , Male , Middle Aged , Polyps/physiopathology , Predictive Value of Tests , Reproducibility of Results , Stroboscopy/methods , Time Factors , Vibration , Video Recording/methods , Visual Perception , Vocal Cord Paralysis/physiopathology , Vocal Cords/physiopathology
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