Fig 1.
a) WM of bilateral superior frontal gyri; b) WM of bilateral precentral gyri; c) WM of bilateral superior parietal gyri; d) bilateral anterior cingulum; e) fornix, internal capsule and splenium of the corpus callosum; f) genu of the corpus callosum, and WM bilateral occipital; g) superior longitudinal fasciculus.
Fig 2.
DWI and FA from a representative subject.
a) b = 0 images; b) DWI images; c) FA maps. Five representative slices are shown from the left to the right.
Fig 3.
Scatter plots and regression lines for FA as a function of age.
y-axis is for FA values while x-axis is for age. a) Regression with negative slopes; b) Regression with zero slopes; c) Regression using quadratic models. P values in a) and b) are for testing the hypothesis whether slope = 0; P values in c) are for testing the hypothesis whether linear model is better than quadratic model; PK in c) represents peak positions of the quadratic fit.
Table 1.
Statistics of effects of age on regional whiter matter ROIs across the age span for FA.
Table 2.
Statistics of effects of age on regional whiter matter ROIs across the age span for RD.
Fig 4.
Scatter plots and regression lines for RD as a function of age.
y-axis is for RD values while x-axis is for age. a) Regression using linear models; b) Regression using quadratic models. P values in a) are for testing the hypothesis whether slope = 0; P values in b) is for testing the hypothesis whether linear model is better than quadratic model; ND in b) represents nadir position of the quadratic fit.