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Fig. 10. Tagged magnetization depicting 3-D strain associated with anterior
protrusion of the human tongue. (A) A grid of supersaturated MRI tags was
applied to the resting tongue in the mid-sagittal imaging plane, and principal
strain depicted for the x, y and z components of the strain
tensor in terms of a color-coded pseudosurface smoothed by bicubic splines. A
bidirectional contraction in the y- and z-directions
resulted in tissue protrusion in the x-direction. (B) Model of
bidrectional contraction leading to hydrostatic elongation. Contraction of
muscle fibers orthogonally aligned to each other results in hydrostatic
elongation in the remaining direction (dashed lines), without a change in
tissue volume. (Reproduced with permission from
Napadow et al., 1999a.)
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