Table of Contents
What is B value in diffusion?
b value measures the degree of diffusion weighting applied, thereby indicating the amplitude (G), time of applied gradients (δ) and duration between the paired gradients (Δ) and is calculated as: b = γ² G² δ² (Δ−δ/3)
What is DTI used to diagnose?
Diffusion-tensor imaging (DTI) is a noninvasive medical imaging tool used to investigate the structure of white matter. The signal contrast in DTI is generated by differences in the Brownian motion of the water molecules in brain tissue.
Whats the difference between DWI and DTI?
While DWI refers to the contrast of the acquired images, DTI is a specific type of modeling of the DWI datasets.
What is tensor in DTI?
the word tensor indicates the use of a 3×3 matrix with eigenvalues and eigenvectors as its constituents. the two main parameters derived from DTI data are mean diffusivity (MD), also referred to as apparent diffusion coefficient (ADC), and fractional anisotropy (FA)
What is diffusion tensor imaging?
Diffusion Tensor Imaging (DTI) is a technique that detects how water travels along the white matter tracts in the brain (Fig. 2). White-matter tracts connect different parts of the brain and must be protected during surgery.
What is DWI used for?
DWI is commonly used to detect and stage tumors, and also to monitor tumor response to treatment over time. DWI can also be collected to visualize the whole body using a technique called ‘diffusion-weighted whole-body imaging with background body signal suppression’ (DWIBS).
What is diffusion tensor magnetic resonance imaging?
See other articles in PMC that citethe published article. Diffusion tensor magnetic resonance imaging (DTI) is a relatively new technology that is popular for imaging the white matter of the brain.
What is the history of diffusion tensor?
The diffusion tensor was originally proposed for use in magnetic resonance imaging (MRI) by Peter Basser in 1994 [5, 6]. Before DTI, diffusion MRI [7, 8] had developed from research in diffusion nuclear magnetic resonance [9].
What is the 3×3 diffusion tensor?
Diffusion Tensor. A superior method to model diffusion in complex materials is to use the diffusion tensor, a [3 x 3] array of numbers corresponding to diffusion rates in each combination of directions. The three diagonal elements (Dxx, Dyy, Dzz) represent diffusion coefficients measured along each of the principal (x-, y- and z-) laboratory axes.
Are the measures from the diffusion tensor scalar independent?
Often in scientific studies, the reported measures from the diffusion tensor are not independent. However, complete sets of orthogonal (mathematically independent) scalars have been defined [46, 47]. 4.2 Colors derived from DTI Another type of image can represent the major eigenvector field using a mapping to colors (Figure 5).