Multiple Sclerosis International / 2013 / Article / Fig 1

Review Article

DTI Measurements in Multiple Sclerosis: Evaluation of Brain Damage and Clinical Implications

Figure 1

Elliptical representation of a diffusion tensor with the 3 main axes: the longest axis stands for the primary eigenvector ( ), reflecting the diffusion parallel to the fibers; the two shorter axes represent the second ( ) and third ( ) eigenvectors, whose average provides a measure of diffusivity perpendicular to the fibers.