Fractional anisotropy (FA) is a quantitative measure used in diffusion tensor imaging (DTI), a type of magnetic resonance imaging (MRI) that evaluates the diffusion of water molecules in biological tissues. FA quantifies the degree of directionality of water diffusion in a medium, which can provide insights into the integrity of white matter tracts in the brain. In more detail: - **Diffusion**: Water molecules in biological tissues tend to move in various directions.
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A dimensionless measure of dispersion among the diffusion tensor eigenvalues. With eigenvalues and mean , when the denominator is nonzero. It is not a direct measure of axon number or functional necessity.