What is Diffusion MRI?
Diffusion MRI (dMRI) is a MRI method that measures molecular diffusion in biological tissues. As molecules interact with many different obstacles as they diffuse throughout tissues, dMRI provides insight into the microscopic details of tissue architecture.
Why is diffusion used in MRI?
Diffusion-weighted images are very useful to diagnose vascular strokes in the brain. It is also used more and more in the staging of non-small-cell lung cancer, where it is a serious candidate to replace positron emission tomography as the ‘gold standard’ for this type of disease.
What is a diffusion gradient MRI?
A diffusion-weighted image is the unprocessed result of the application of a single pulsed gradient SE sequence in one gradient direction, and it corresponds to one point in q-space. Even though such an image is rather simple, it does contain some information about diffusion.
What diffusion restricts on MRI?
Many pathologies cause restricted extracellular diffusion of water protons including infarction, cytotoxic edema, high cellularity within tissue, viscous fluid, demyelination, and metabolic disturbances.
How is DTI different from MRI?
The MRI scanner measures this signal difference and displays the activity as a colored area (Fig. 1). Diffusion Tensor Imaging (DTI) is a technique that detects how water travels along the white matter tracts in the brain (Fig. 2).
What is diffusion example?
Perfume is sprayed in one part of a room, yet soon it diffuses so that you can smell it everywhere. A drop of food coloring diffuses throughout the water in a glass so that, eventually, the entire glass will be colored.
What is diffusion weighted imaging?
Diffusion weighted imaging (DWI) is a method of signal contrast generation based on the differences in Brownian motion. DWI is a method to evaluate the molecular function and micro-architecture of the human body.