MS UMB/2001/107 Revision NONINVASIVE ASSESSMENT OF VOCAL FOLD MUCOSAL WAVE VELOCITY USING COLOR DOPPLER IMAGING
Date Issued
2001
Date
2001
Author(s)
Shau, Yio-Wha
Wang, Chung-Li
Hsieh, Fon-Jou
Hsiao, Tzu-Yu
DOI
2006092712165907039
Abstract
The vibratory movement of the vocal folds (VF) plays an important role in normal
function of phonation. We developed a noninvasive technique to quantify the
human MWV in vivo using color Doppler imaging (CDI). During phonation the
motion of mucosa-air interface generates a unique pattern of US color artifacts
which assist the identification of true VF location. An in vitro study using vibrating
string phantom was conducted to investigate how the CDI displayed a vibrating
soft tissue at high frequency. The vibrating amplitude, frequency, mass density
and the acoustic impedance of the soft tissues were found to dominate the
formation of color artifacts. Based on the model of finite string with fixed ends, we
estimated the mean mucosal wave velocity (MWV) for ten adult volunteers (6M 4F,
age 34±5) with normal VF function. The mean MWVs for the male subjects were
found vary from 2.1 to 10 m/s in frequency range of 85-310 Hz at their comfortable
pitch and intensity, while the females typically had higher MWV that varied from 5.0
to 16.5 m/s in frequency range of 180-480 Hz. The MWV increased linearly with
the frequency and there was no observable difference in mucosa stiffness due to
the effect of gender. The variation in MWV as it propagates vertically can be seen
from the color and shape of the artifacts. The VF polyp resulted in abnormal
MWV and different CDI vibratory artifacts. The CDI artifacts provide the insight of
the dynamics of mucosa structure during phonation, and the method presented is
promising for noninvasive monitoring of laryngeal functions clinically.
Subjects
Color Doppler Image
Vocal Fold
Mucosal Wave Velocity
Phonation
Function
Function
Ultrasound Artifacts
Laryngeal Ultrasonography
Publisher
臺北市:國立臺灣大學應用力學研究所
Type
thesis
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