Jul 9, 2024 · Diffusion tensor imaging (DTI) is an MRI technique that uses anisotropic diffusion to estimate the axonal (white matter) organization of the brain. Fiber tractography (FT) is a 3D reconstruction technique to assess neural tracts using data collected by diffusion tensor imaging.

Jan 15, 2013 · MD is an inverse measure of the membrane density, is very similar for both GM and WM and higher for CSF. MD is sensitive to cellularity, edema, and necrosis.

DTI is a sensitive probe of cellular structure that works by measuring the diffusion of water molecules. The measured quantity is the diffusivity or diffusion coefficient, a proportionality constant that relates diffusive flux to a concentration gradient [ 8 ] and has units of m m 2 s .

DTI is an emerging neuroimaging method for identifying microstructural changes. Various DTI scalars—such as FA, AD, RD, MD, and MO—can be correlated with clinical information in order to reveal abnormalities associated with neurological diseases.

Oct 8, 2015 · What is a tensor? How do tensor values relate to diffusion measures like FA, MD, AD and RD? Learn more about what underlies DTI analyses.

Diffusion MRI (dMRI) acquires diffusion-sensitive MRI data to reveal the microscopic change of biological tissues structure. The dMRI data are processed to provide diffusion metrics, such as diffusivities and anisotropy to summarize the diffusion pattern.

What is Diffusion Tensor Imaging (DTI), and how does it differ from "regular" diffusion-weighed imaging? Diffusion tensor imaging (DTI) comprises a group of techniques where calculated eigenvalues (λ 1, λ 2, and λ 3) and eigenvectors (ε 1, ε 2, and ε 3) are used to create images reflecting various diffusion properties of a tissue.

Diffusion Tensor Imaging (DTI) studies are increasingly popular among clinicians and researchers as they provide unique insights into brain network connectivity. However, in order to optimize the use of DTI, several technical and methodological aspects must be factored in.

Sep 11, 2019 · Accurate quantification of fractional anisotropy (FA) and mean diffusivity (MD) in MR diffusion tensor imaging (DTI) requires adequate signal-to-noise ratio (SNR) especially in low FA areas...

Mean Diffusivity (MD): Another scalar measure from DTI that quantifies the total velocity of diffusion, a signal that has been tied to tissue cellularity, edema and necrosis. The diffusivity within a voxel or region is a common metric used to examine lifespan changes.