To reconstruct the trajectories of forearm muscle fibers during dynamic contractions, we designed a customized MRI-compatible rig to help acquire MRI data of the forearm muscles under three wrist postures. A piecewise registration method was proposed to correct the misregistration between DTI and anatomical images. The reconstructed supinator was highly consistent with the cadaveric dissection reference. Diffusion and architectural parameters were calculated to characterize voluntary contractions. During the wrist flexion and extension, the fascicle length of the supinator was inversely related to the pennation angle. The diffusion parameters increased slightly from neutral position to the other two postures.
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