Multiple Sclerosis International / 2013 / Article / Tab 1

Review Article

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

Table 1

Schematic description of the main DTI parameters.

Unit of measureFormulaObject measured

FAScalar value ranging between 0-1 Fibers directionality/axonal loss
MDmm2/sec Amount of water diffusion/myelin loss
ADmm2/sec Diffusivity parallel to the fibers/myelin and axonal content
RDmm2/sec Diffusivity perpendicular to the fibers/myelin content

FA: fractional anisotropy; MD: mean diffusivity; AD: axial diffusivity; RD: radial diffusivity; mm: millimeters; sec: second.