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MRI of teeth contours in articulation processes
G. Kedrova, N. Anisimov, L. Zaharov, O. Nikolaev Moscow State Lomonosov University Abstract The research is focused on experimental methods and technology for detailed MR-visualization of solid calciferous tissue boundaries (i.e. teeth and adherent bony structures) and estimation of overall resonance shape throughout the speech production process. Vocal tract area evaluation from MRI data requires a special technique for tooth visualization because of the lack of signal from the teeth as objects consisting of solid calciferous tissue. In this paper, a new method is proposed to capture MR-images of this kind of biological objects and accurately superimpose their outlines onto MRimages of sagittal plane of articulatory tract. Upper and lower incisors' MR-images with the surrounding bony structure are obtained by MR-scanning a subject with a contrast medium enveloping teeth's surfaces. As a contrast medium we've used a chewing gum turned out to be an adhesive material with optimal for MRI special properties. The teeth and adherent bony tissue contours were su perimposed onto the target MR-images (MR-scanning of Russian vowel articulations) using certain guiding landmarks recommended in the appropriate literature. Keywords: MRI, tooth visualization, tooth superimposition, vocal tract configuration, vocalic system of the Russian language. 1. - () ­ , - , ( ) . , , . , , , , ( , ­ , , ..) [1]. , , , : , , ( ) .. . - . ( ­ , -


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