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. Author manuscript; available in PMC: 2023 Jul 1.
Published in final edited form as: Neuroimage. 2022 Feb 23;254:118958. doi: 10.1016/j.neuroimage.2022.118958

Fig. 2. Illustration of the different length scales accessible by diffusion MRI in the brain.

Fig. 2.

Macrostructure refers to structures on the whole-brain and regional level, while microstructure refers to structures on the microscopic level, e.g., cells and axons. Mesostructure resides in the intermediate, millimeter to sub-millimeter regime, on the order of the typical MRI voxel size. Figure contents adapted from (Reisert et al., 2017).