Abstract
3D and 4D MRI provides unique, high dimensional data for use in clinical applications and scientific models. Our group is currently using diffusion tensor MRI (DTI) and tagged-cine MRI (tMRI) to explore the fiber direction of muscles in the tongue and the shortening patterns of those fibers during speech. tMRI uses “magnetic tags” to mark and track tissue points, so that when the tissue deforms, the tags reflect these deformations. Soft tissue motion patterns, such as those within the tongue during speech, provide a link between muscle activation and tongue surface shape. Tissue points also demark the endpoints and internal points of muscles, and can identify tongue muscle position and shortening during speech. Tracking tongue muscle motion is unique to tMRI because their interdigitated fibers make them fairly opaque to EMG. Disambiguating muscles and identifying their shortening pattern is a first step to relating muscle action to tongue deformation. The second tool, DTI, identifies the location and orie...
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