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(a) An example of voxels with FA≥0.6 within the corpus callosum (cc) of a human subject. These voxels are assumed to contain one fiber per voxel. (b) An example of the PDF of the diffusion field measured by 25 gradients in 40 such voxels selected randomly from among 12 subjects. The PDF suggests non-Gaussianity of the diffusion measurements. For comparison, the corresponding Gaussian distribution is shown in red.
