Endoscopic Approach to Voice Disorders Part1. Analysis of Vocal Fold Vibration by X-Ray Stroboscopy-Underlying Principle of Vocal Fold Vibration-

Vocal fold vibration and voice quality.

There have been various methods proposed for diagnosing laryngeal pathology by analyzing the pathological voice. However, even if two diagnoses are the same, the voice quality might not be the same. In other words, it is difficult to diagnose laryngeal pathology only by acoustic parameters. In this study, we analyze the vibration patterns seen in various pathological cases to explain pathologic...

Vocal fold vibration patterns and phonatory modes

Externally induced vibration on massive vocal fold.

For successful performance of phonosurgery, it is most important to maintain the flexibility of the vocal fold. Unfortunately, however, there has been no direct effective method so far for assessing the flexibility of the vocal fold membrane. If the vocal fold surface showed any abnormal region where good vibration could not be observed, reduced flexibility was expected in this area. Hitherto, ...

Towards an intermediate water wave model of vocal fold vibration: Evidence from vocal-fold dynamic sonography

A simplified water wave model was developed for predicting the global vibration of human vocal folds. As the depth of the liquids in the lamina propria is 1/2–1/20 of the wavelength, they were analogized to intermediate waters. The water wave model predicted elliptic orbits of the tissue particles with the major axis parallel to the surface, and these ellipses flattened with depth. This vibrati...

Cricothyroid muscle dysfunction impairs vocal fold vibration in unilateral vocal fold paralysis.

OBJECTIVES/HYPOTHESIS The relevance of the cricothyroid (CT) muscle in patients with unilateral vocal fold paralysis (UVFP) remains controversial. To clarify the functional significance of the CT muscle in patients with UVFP, the confounding effect of the severity of recurrent laryngeal nerve injury should be taken into consideration. In the present study, quantitative laryngeal electromyograph...