Diffusion MRI can provide useful information on microstructures that are much smaller than the imaging voxel sizes. This presentation will start from the original idea by Callaghan and Cory and Garroway showing that the diffusion NMR signal is the Fourier transformation of the displacement probability function, followed by examples of MRI experiments to infer microstructural properties of biological tissues. The basic concepts of q-space and propagator based methods will be discussed.
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