Sentence examples for primary diffusion direction from inspiring English sources

As the axial diffusivity represents the diffusivity along the primary diffusion direction whereas the radial diffusivity indicates the diffusivity orthogonal to the primary diffusion direction (calculated by averaging the second and third eigenvalues of the diffusion tensor), it was hypothesized that axial diffusivity is an indirect indicator of the integrity of axons.

In contrast, AD represents the diffusivity along the primary diffusion direction and is assumed to characterize the integrity of axons (Gao et al., 2009; Glenn et al., 2003; Sun et al., 2006).

By sorting the eigenvalues in the order of decreasing magnitude for each voxel (λ1 > λ2 > λ3), λ1 represents the diffusivity along the primary diffusion direction, that is, along the fibre axis, and is referred to as the axial diffusivity λ ∥.

RD indicates the diffusivity along directions which are orthogonal to the primary diffusion direction and is an indirect indicator of myelination (Song et al., 2005; Wu et al., 2011).

After these processes, using DTIFit within the FMRIB's diffusion toolbox, the images were calculated to get the FA, λ1 (longitudinal diffusivity) (the magnitude of diffusion along the principal diffusion direction) and λ23 (radial diffusivity) (the magnitude of diffusion in the two orthogonal directions perpendicular to the principal diffusion direction) maps.

DTI tractography draws upon the principle that the dominant direction of water diffusion (principal diffusion direction) coincides with the local tangent direction of fibrous tissue, and integration of the principal diffusion directions permits entire fiber tracts to be delineated [4], [5].

The main diffusion direction of water molecules within tissues defines the color coding in fiber tracking.

Individual ROIs were manually defined on colour-coded maps of the main diffusion direction without thresholding.

The principal diffusion directions of both tensors are displayed.

Similarly, the number and orientation of the main diffusion directions are preserved, but, what is crucial, the information about diffusion coherence is lost.

In these voxels a two tensor model was fitted, with the principal diffusion directions of the two diffusion tensors providing estimates of the orientations of the crossing fibers.