3D Shear strain analysis of Medial Gastrocnemius muscle based on Velocity Encoded and Diffusion Tensor Imaging data.
Vadim Malis 1 , Usha Sinha 1 , Robert Csapo 2 , and Shantanu Sinha 2
Physics, SDSU, San Diego, CA, United States,
UCSD, San Diego, CA, United States
The objective quantification of regional muscle
deformation is a valuable clinical tool to evaluate
normal and diseased muscle. Several studies have shown
that the strain and strain rate (SR) tensor are not
aligned with the DTI tensor indicating the presence of
shear strain. We report here, 3D SR tensor mapping of
the medial gastrocnemius and identify shear strain
components from a series of velocity encoded images
acquired during isometric contraction by aligning the 3D
SR tensor along the principal axes of the diffusion
tensor (Fiber Aligned Strain Rate). The in-plane shear
strain component arising from asymmetric in-pane
deformation was identified.
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