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Table 1 Definition of terms.

From: Diagnostic confirmation of mild traumatic brain injury by diffusion tensor imaging: a case report

Term Definition
Traumatic brain injury A form of acquired brain injury resulting from sudden trauma to the head. Complications of such an injury can result in permanent or temporary deficits in cognitive, physical and psychosocial functions.
Magnetic resonance imaging (MRI) Currently the most sensitive imaging test of the head commonly used in clinical practice. An MRI uses a magnetic field and radiofrequency pulses to provide detailed images of soft tissues and internal body structures.
Diffusion tensor imaging (DTI) A new technology capable of providing images of neural tracts. DTI accomplishes this by measuring the restricted diffusion of water through tissues.
Fractional anisotropy (FA) A scalar value between zero and one that describes the degree of anisotropy of a diffusion process. A value of zero means that diffusion is isotropic, that is, it is unrestricted (or equally restricted) in all directions. A value of one means that diffusion occurs only along one axis and is fully restricted in all other directions
Neuropsychological evaluation An evaluation in which a trained neuropsychologist can acquire data about a subject's cognitive, motor, behavioral, language and executive functioning. Such information can lead to a diagnosis as well as to the localization of abnormalities in the central nervous system.