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Figure 16c. Extraction of scalar values from diffusion tensor imaging. (a) Image shows mean diffusion, which is the trace of the diffusion tensor. An image of ADC averaged over three orthogonal directions would have a similar appearance. (b) Image shows the fractional anisotropy, which is computed from the eigenvalues of the diffusion tensor. (c) Color-coded image shows the orientation of the principal direction of diffusion, with red, blue, and green representing diffusion along x-, y-, and z-axes, respectively. The color intensity is proportional to the fractional anisotropy.
