Abstract
The strobo-motion-analyzer is a newly developed device that can synchronously record and analyze both the video signal of the vibrations of the vocal folds and certain voice-related signals (VRS), including the voice signal, EGG, and subglottic pressure by using the flash signal to the strobolight of the laryngostroboscope as a trigger pulse.
Laryngostrobography is a method of recording and analyzing with the strobo-motion-analyzer. It can order 128 fields of the vibratory images of the arbitrary transverse section of the vocal folds in time series as a single still image (Strobogram) superimposed with VRS.
The strobogram of vocal folds stiffened, for example by cancer, a postoperative scar, a cyst, or the like, is compared with that of the normal vocal folds.
The essential principle of vocal fold vibration is the traveling wave motion in the membranous portion of the vocal folds, whose wave crest travels continuously from the lower portion toward the upper potion of the vocal folds.
However, the traveling wave motion is greatly disturbed and changed into the standing wave motion when the vocal folds are stiffened.
