MRIによる日本語5母音の声道形状および声道長の精密計測法

概要

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We developed a method to measure accurately 3-dimensional vocal tract (3DVT) shape and length using magnetic resonance imaging (MRI) . The 3D VT shape was reconstructed from coronal MR images of the oral cavity and axial images of the glottal and pharyngeal regions. A mid-sagittal MR image was acquired as a reference for the 3D VT reconstruction. It was also used for calculation of VT length. MR images of an adult during sustained phonation of the Japanese vowels /a, i, u, e, o/ were acquired. We compared formant frequencies computed from the 3D VT shapes estimated by the proposed method with those directly measured from the original utterances. Excetp for the frst formant frequency of the vowel /i/, measurement errors for the lowest three formant frequencies of all vowels were less than the difference limen.
日本音声言語医学会の論文