Lateral cephalograms and cone beam computed tomography(CBCT) have been used to examine adenoids. However, these examination methods are invasive because of radiation exposure, and it is unsuitable to screen the young children. An alternative approach may be analysis of voice signals, which contain information on vocal fold vibration and vocal tract morphology. The cepstrum analysis, an acoustic analysis, can extract information on the morphology of the vocal tract. This study aimed to examine adenoids by performing acoustic analysis on nasal sounds.
Fourteen subjects(8 boys and 6 girls; mean age 8.1±1.3 years)were included in the adenoid group and 14 subjects(6 boys, 8 girls, mean age 8.5±1.2 years old)were included as the control group. Lateral cephalogram and CBCT were used for evaluating the anatomical morphology; the wavelength to vocal tract length ratio(WVR)was calculated from the vocal signal of the nasal sound by cepstrum analysis. Then, these parameters were compared between the groups. The identification boundary value of adenoids with WVR was also examined.
A/N, pharyngeal tonsil length, and pharyngeal tonsil thickness was significantly larger ,and distance of narrowest part of the airway, PNS1-PNS2 was significantly smaller in the
adenoid group than the control group.
In cepstrum coefficients 40, 44, 48, 52, and 56, WVR was significantly smaller in the adenoid group. Additionally, in the range of cepstrum coefficients 44 to 56, 80% or more adenoids was expected to be identified.
The findings suggest that cepstrum analysis could be used to examine adenoids noninvasively.
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