1997 Volume 9 Issue 2 Pages 125-127
Horizontal and vertical movements of the folds were analyzed during phonation simultaneously using Video-stroboscopy (VSS) and Laser Doppler Vibrometory (LDV). Two extracted canine larynges were used. Laser light reflected on the upper surface of the vocal fold was fed into LDV to measure vertical velocity (Vvt) of the vocal fold. VSS determined traveling wave velocity (TWV) by measuring the duration of time the traveling wave moves between two markers placed on the vocal fold with known distance. Vvt and TWV were recorded simultaneously under two conditions; before and after vocal fold elongation. Airflow was increased from 81/min to 141/min under both of the above mentioned conditions. TWV always increased as mean airflow rate was raised. When the vocal fold was elongated, both TWV and Vvt became greater. TWV and Vvt had a significantly high correlation, which suggested that Vvt as well as TWV is an useful index of mucosal traveling wave.
