Abstract
The mechanical properties of the vocal fold mucosa have a great effect on the vocal folds oscillations, and voice quality. A non-invasive method was developed and examined to obtain the mechanical properties of human vocal fold tissue in vivo via measurements of the mucosal wave propagation speed during phonation. High speed and MRI images of three subject’s vocal folds were captured while phonating at different pitches. The images obtained from these two techniques were matched and the dimensions of the vocal folds were obtained. The mucosal wave propagation speed was determined for the three subjects at different pitches through an automatic image processing procedure. The shear modulus of the subjects’ vocal fold mucosa was then calculated using a surface (Rayleigh) wave propagation model and the measured wave speeds. This is revealed that the mucosal wave propagation speed and the shear modulus of the vocal fold tissue increased with the pitch. The results were in good agreement with those from other studies obtained via in vitro measurements, thereby supporting the validity of the proposed measurement method. This method offers the potential for in vivo clinical assessments.
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