HIGH-SPEED, LIGHT-INTENSIFIED DIGITAL IMAGING OF VOCAL FOLD VIBRATIONS IN HIGH OPTICAL RESOLUTION VIA INDIRECT MICROLARYNGOSCOPY

Digital imaging of vocal fold vibrations is mainly limited by lighting problems. We present a new technique for high optical resolution of v ocal fold vibrations (via indirect microlaryngoscopy) using a light in tensifier camera. Superficial epithelial structures and secretions can be followed during vibrations by means of high magnification. Recordi ngs of up to 2.4 seconds and 6,000 frames per second, combined with si multaneous recording of acoustic and electroglottographic signals, am possible. This technique allows instant slow-motion monitor control an d subsequent documentation on a normal video recording system. We also present preliminary findings of typical vocal fold motion patterns.