Analysis of vocal fold vibration by x-ray stroboscopy with multiple markers.
OBJECTIVE
To derive a more precise description of vocal fold vibration, experimental phonation of excised canine larynxes was studied.


METHODS
Multiple X-ray-positive markers were inserted, and their vibratory movement was observed with x-ray stroboscopy with change of pitch and intensity. A histologic study was also carried out.


RESULTS
Regular waves were observed just above the lowest point of the lamina propria of the mucous membrane, which shifted upward at high pitch, but downward in high intensity.


CONCLUSIONS
The starting point of the mucosal wave was confirmed on the lower surface of the vocal fold, histologically just above the lowest point of the lamina propria of the mucous membrane and shifted upward at high pitch, but downward in high intensity.


CONCLUSIONS
This is the first study investigating the starting point of mucosal wave in vocal fold vibration in a frontal plane using x-ray stroboscopy, providing the evidence for the body-cover theory.
Kusuyama
T
T
Department of Oto-Rhino-Laryngology, School of Medicine, Keio University, Tokyo, Japan. YHZ02650@nifty.ne.jp
Fukuda
H
H
Shiotani
A
A
Nakagawa
H
H
Kanzaki
J
J
D000818:Animals; D004285:Dogs; D006801:Humans; D007820:Laryngeal Mucosa / Q000502:physiology; D007828:Laryngoscopy / Q000379:methods*; D011859:Radiography; D014732:Vibration; D014827:Vocal Cords / Q000000981:diagnostic imaging* / Q000502:physiology*