Diffusion Tensor Imaging

Diffusion Tensor Imaging (DTI) is a form of magnetic resonance imaging that allows researchers to assess changes in the diffusion of molecules, typically water molecules, in brain tissue. It is used to non-invasively detect changes in white matter tracts that typically are associated with diseases, aging, and trauma in the brain. DTI measures the direction and rate of water diffusion in brain tissue, which in turn provides an index of the structural integrity of tissue. It utilizes multiple MRI image acquisitions with different measurement directions to compute diffusivity measures of white matter tracts such as the fractional anisotropy (FA) and the mean diffusivity (MD). FA reflects the degree of directionality in the measured directions and MD reflects the overall magnitude of the diffusion process. Thus, abnormalities in brain tissue can be easily detected with DTI. DTI is used to assess a variety of neurological conditions, including Alzheimers, traumatic brain injury, stroke, neurodegenerative diseases, and multiple sclerosis. It can also be used to assess the response to treatments such as drug and behavioral therapies. By analyzing DTI images, doctors can better understand the underlying damage and changes taking place in the brain due to the condition or treatment. In addition, DTI is used to study brain development over time and to investigate the differences between healthy and diseased states. By assessing the age-related changes in the diffusion of water molecules, researchers can track the development of the brain. DTI has also proven to be a useful tool in psychiatric research.