A spatio-temporal atlas and statistical model of the tongue during speech from cine-MRI

Jonghye Woo, Fangxu Xing, Junghoon Lee, Maureen Stone, Jerry Ladd Prince

Research output: Contribution to journalArticle

Abstract

Statistical modelling of tongue motion during speech using cine magnetic resonance imaging (MRI) provides key information about the relationship between structure and motion of the tongue. In order to study the variability of tongue shape and motion in populations, a consistent integration and characterisation of inter-subject variability is needed. In this paper, a method to construct a spatio-temporal atlas comprising a mean motion model and statistical modes of variation during speech is presented. The model is based on the cine MRI from 22 normal speakers and consists of several steps involving both spatial and temporal alignment problems independently. First, all images are registered into a common reference space, which is taken to be a neutral resting position of the tongue. Second, the tongue shapes of each individual relative to this reference space are produced. Third, a time warping approach (several are evaluated) is used to align the time frames of each subject to a common time series of initial mean images. Finally, the spatio-temporal atlas is created by time-warping each subject, generating new mean images at each time, and producing shape statistics around these mean images using principal component analysis at each reference time frame. Experimental results consist of comparison of various parameters and methods in creation of the atlas and a demonstration of the final modes of variations at various key time frames in a sample phrase.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalComputer Methods in Biomechanics and Biomedical Engineering: Imaging and Visualization
DOIs
StateAccepted/In press - Apr 10 2016

Keywords

  • MRI
  • spatio-temporal atlas
  • speech
  • tongue motion

ASJC Scopus subject areas

  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging
  • Computational Mechanics
  • Computer Science Applications

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