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Kymograph of continuous MRI images for analyzing speech articulations
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Paper Abstract

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.

Paper Details

Date Published: 22 March 2019
PDF: 5 pages
Proc. SPIE 11049, International Workshop on Advanced Image Technology (IWAIT) 2019, 110491X (22 March 2019); doi: 10.1117/12.2521519
Show Author Affiliations
Makoto J. Hirayama, Osaka Institute of Technology (Japan)
Sayoko Takano, Kanazawa Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 11049:
International Workshop on Advanced Image Technology (IWAIT) 2019
Qian Kemao; Kazuya Hayase; Phooi Yee Lau; Wen-Nung Lie; Yung-Lyul Lee; Sanun Srisuk; Lu Yu, Editor(s)

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