3D Shear strain analysis of Medial Gastrocnemius muscle based on Velocity Encoded and Diffusion Tensor Imaging data.

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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