An approach to real-time magnetic resonance imaging for speech production

J Acoust Soc Am. 2004 Apr;115(4):1771-6. doi: 10.1121/1.1652588.

Abstract

Magnetic resonance imaging (MRI) has served as a valuable tool for studying static postures in speech production. Now, recent improvements in temporal resolution are making it possible to examine the dynamics of vocal-tract shaping during fluent speech using MRI. The present study uses spiral k-space acquisitions with a low flip-angle gradient echo pulse sequence on a conventional GE Signa 1.5-T CV/i scanner. This strategy allows for acquisition rates of 8-9 images per second and reconstruction rates of 20-24 images per second, making veridical movies of speech production now possible. Segmental durations, positions, and interarticulator timing can all be quantitatively evaluated. Data show clear real-time movements of the lips, tongue, and velum. Sample movies and data analysis strategies are presented.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Biomechanical Phenomena
  • Humans
  • Larynx / anatomy & histology
  • Larynx / physiology
  • Lip / anatomy & histology
  • Lip / physiology*
  • Magnetic Resonance Imaging / methods*
  • Palate, Soft / anatomy & histology
  • Palate, Soft / physiology*
  • Phonation / physiology*
  • Tongue / anatomy & histology
  • Tongue / physiology*
  • Verbal Behavior / physiology