Kymograph of continuous MRI images for analyzing speech articulations
Kymograph of continuous MRI images for analyzing speech articulations
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用于分析语音发音的连续 MRI 图像 Kymograph
DOI：
10.1117/12.2521519
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发表时间：
2019
影响因子：
11.1
通讯作者：
S. Takano
中科院分区：
文献类型：
--
作者：
M. Hirayama;S. Takano
使用磁共振成像（MRI）分析语音发音。一种同步采样方法，即受试者通过听咔哒声以一定的节奏重复说出相同的伪单词，用于从相对缓慢的成像中捕获语音发音器的运动数据。以日语的/a-ei- u-e-o-a-o/、/ka-ke-ki-ku-ke-ko-ka-ko/和/ga-ge-gi-gu-ge-go-ga-go/音节序列为研究对象，比较了语音发音的位置和运动，分析了不同辅音和元音模式下语音发音的详细差异。为了分析主要由舌头运动引起的声道狭窄位置的时间序列，提出了一种基于MRI图像的声道声速图分析方法。在相对于声道的垂直方向上从MRI图像上取薄片。这张薄片图像有声道的上下边界，即硬腭或软腭和舌头的上表面。从所有帧中取出相同的切片，然后按时间顺序将它们排成一行。这个序列的切片图像看起来像一个脉搏图。这将是一个有用的工具，观察一个部分的声道距离变化的时间序列，引起舌头的运动。
Magnetic Resonance Imaging (MRI) was used for analyzing speech articulations. A synchronized sampling method, which is that a subject person repeats speaking a same pseudo word at a tempo by hearing click sounds, was used to enable capturing speech articulators' motion data from relatively slow imaging. For Japanese syllable sequences of /a-ei- u-e-o-a-o/, /ka-ke-ki-ku-ke-ko-ka-ko/, and /ga-ge-gi-gu-ge-go-ga-go/, positions and motions of speech articulators were compared for analyzing detailed differences of speech articulations depending on patterns of consonants and vowels. To analyze time series of narrowing positions of a vocal tract caused mainly by tongue motions, a kymograph method from MRI images is proposed. A thin slice is taken from MRI image in a vertical direction relative to a vocal tract. This thin sliced image has upper and lower boundaries of a vocal tract, that is, a hard or soft palate and an upper surface of a tongue. The same slices are taken from all frames and then they are put in a line in a sequence of time. This sequence of sliced image is looked like a kymograph. It will be a useful tool to observe time series of distance changes of one section of a vocal tract, caused by tongue motions.