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Figure 2. (a) Map of the mean diffusion (D) for a horizontal slice of the normal volunteer investigated, demonstrating the regions of interest used in the study, which are (from top to bottom) noise (N), cerebrospinal fluid (CSF), internal capsule (IC), splenium corpus callosum (CC) and occipital cortex (Cx). The scale on the right indicates the magnitude of D. (b) Map of the fractional anisotropy (FA) for the same horizontal slice of the normal volunteer investigated, demonstrating the location of the same regions of interest. The scale on the right indicates the dimensionless magnitude of FA. (c) p:q plane illustrating the defined regions of interest (ROIs) in the normal volunteer. Three clusters are observed for the noise (N), with small components for both p and q. The three parenchyma ROIs (CC, IC, Cx) are located along a line with approximately the same value of p, but significantly different values of q. The CSF has a much larger dispersion and a larger value of mean diffusion.
