DETERMINATION OF MUSCLE-FIBER ORIENTATION USING DIFFUSION-WEIGHTED MRI

Biomechanical studies have shown that the distribution of stress and s train in biological tissue is strongly dependent on fibre orientation. Therefore, to analyze the local mechanical load accurate data on musc le fibre orientation are needed. Traditional techniques to determine f ibre orientation are inherently invasive. Here we used Diffusion Weigh ted MRI to non-invasively determine, in each image voxel of 0.23 x 0.2 3 mm, the diffusion tensor of water in the cat semimembranosus muscle. The direction corresponding to the largest eigenvector of this tensor was calculated. This direction was found to correspond qualitatively to the muscular fiber direction, as determined by visual inspection.