Videostrobokymography: A new method for the quantitative analysis of vocalfold vibration

Objectives: To develop a new analysis method for the quantitative assessmen t of vibration of the vocal folds, using conventional videostroboscopic ima ge data. Methods: We used prerecorded videostroboscopic images to evaluate quantitatively the vibration of the vocal folds, Successive images were con verted as digital images by means of an image-grabbing board, processed for analysis, and reconstructed as kymograms by rearranging the same Lines of all processed images along the time axis. Results: We developed a new techn ique for evaluating the vibration of the vocal folds. The vibrations of mul tiple vocal fold regions were easily and objectively evaluated by this tech nique. The objective parameters, such as open quotient and asymmetry index, could be obtained easily using this technique. Conclusions: Videostroboky- mography demonstrated objectively the vibrations of several vocal fold regi ons at the same time. This technique has the potential to be a new tool to analyze and monitor the pathological changes and treatment results of vocal fold movement in a more refined quantitative fashion, using videostrobosco pic images.