Abstract

ROMERO, Carlos; GHISI, Juan Pablo; MAZZUCCO, Juan  and  TERNAK, Alejandro. Imágenes con tensor de difusión en resonancia magnética. Rev. argent. neurocir. [online]. 2007, vol.21, n.1. ISSN 1850-1532.

Diffusion-tensor is a recently developed form of diffusion-weighted MRI that enables the assessment of water directionality in living systems and indirect information about the integrity of white matter structures. Diffusion is anisotropic in white matter tracts, as axonal membranes and myelin sheaths present barriers to the motion of water molecules; the direction of maximun diffusivity is contained in the diffusion tensor (DT). DT tractograms are the three-dimensional space representation of the tensor-diffusion images. The direction of maximun diffusivity may be mapped by using red, green, and blue colour channels with colour brightness, resulting in a map from wich the degree of anisotropy and the local fiber direction can be determined. Red color indicates left-right direction as corpus callosum tracts; green color indicates anteroposterior direction, and blue color indicates superior-inferior direction as piramidal tracts. The initial clinical experience showed that diffusion tensor is a potentially useful imaging modality for both diagnosing and assessing patients with stroke, multiple sclerosis, diffuse axonal injuries, schizophrenia and particularly brain tumors.

Keywords : Magnetic resonance; Diffusion tensor; Tractograms.

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