Open AccessHigh‐Speed Camera Observations of Vocal Nodules
Author(s) -
Iwata Yoshihiro,
Toda Hitoshi,
Sakurai Kazuo,
Naitou Kensei,
Horibe Seji,
Yoshioka Satoshi,
Okada Tatuyoshi
Publication year - 2011
Publication title -
otolaryngology–head and neck surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.232
H-Index - 121
eISSN - 1097-6817
pISSN - 0194-5998
DOI - 10.1177/0194599811415823a189
Subject(s) - phonation , vocal folds , process (computing) , anatomy , larynx , medicine , acoustics , audiology , physics , computer science , operating system
Objective We compared the vocal fold vibration pattern among normal subjects and vocal nodules. Observation of the movement to the vocal cord mucosa using a high speed camera, examining a mechanism of abnormal vibration by observing the motion of the vocal process was intended to clarify the cause of vocal nodules. Method Five normal speech and 8 patients with vocal nodules were compared. High‐speed cameras recorded the vocal cord vibration. Easy phonation, 3000 fps or 3333 fps. We are in the position of the vocal process 3 consecutive images of the period, direction, investigated the symmetry of left and right. Results In normal vocal cords vocal process was symmetrical. (5/5 case) Swings from side to side width and vocal process was about the same for both sides. The direction of extension of the vocal process was assembled in the center of the vocal cords membranes. (5/5 case) The midline of the laryngeal vocal nodules vocal process was in a different position on the left and right (7/8 case). Swings were different width of the vocal process (6/8 case). The direction of extension of the right and left vocal process was different. Conclusion In the normal group, parallel to the vocal cords vibrate in contact throughout the mucosa. Vocal nodule group was lateralized position of the vocal process. We thought to focus on one part of the mucous membrane contact between vocal cords. It was considered one of the pathogenesis of vocal nodules.