Abstract #3077

3D Curvature of Medial Gastrocnemius (MG) Muscle Fibers Tracked from Diffusion Tensor Images (DTI): Age Related Differences in 3D fiber curvature.

Yanjie Xue¹, Usha Sinha¹, Vadim Malis², Robert Csapo³, and Shantanu Sinha³

¹Physics, San Diego State University, San Diego, CA, United States, ²Physics, University of California at San Diego, San Diego, CA, United States, ³Radiology, University of California at San Diego, San Diego, CA, United States

Muscle fiber curvature influences muscle function but 3D curvature of the MG remains unexplored. This study determines 3D fiber curvature from young and old cohorts from MG fibers tracked using DTI data. The fiber coordinates are fit to a 2^nd or 3^rd order polynomial before extracting curvature using the Frenet–Serret relationship. The order of the polynomial affects curvature values and the choice may depend on muscle fiber shape. Regional curvature changes were significant between distal and central in the deep, middle and superficial compartments. No significant changes were seen in the curvature between young and old subjects

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