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The diffusion tensor model is a rather simple model of the diffusion process, assuming homogeneity and linearity of the diffusion within each image voxel. [13] From the diffusion tensor, diffusion anisotropy measures such as the fractional anisotropy (FA), can be computed.
One drawback of the Diffusion Tensor model is that it can account only for Gaussian diffusion processes, which has been found to be inadequate in accurately representing the true diffusion process in the human brain. Due to this, higher order models using spherical harmonics and Orientation Distribution Functions (ODF) have been used to define ...
Diffusion MRI (dMRI) – includes diffusion tensor imaging (DTI) and diffusion functional MRI (DfMRI). dMRI is a recent breakthrough in brain mapping allowing the visualization of cross connections between different anatomical parts of the brain.
Brain mapping is a set of neuroscience techniques predicated on the mapping of ... diffusion MRI (dMRI), magnetoencephalography ... From the model, ...
Cascading diffusion model stacks multiple diffusion models one after another, in the style of Progressive GAN. The lowest level is a standard diffusion model that generate 32x32 image, then the image would be upscaled by a diffusion model specifically trained for upscaling, and the process repeats. [53]
Diffusion maps is a dimensionality reduction or feature ... image segmentation, [8] 3D model segmentation, [9] speaker ... [14] revealing brain resting state ...
Neurons in the brain live in an extracellular fluid, capable of propagating both chemical and physical energy alike through reaction-diffusion and bond manipulation that leads to thermal gradients. Volume transmission has been associated with thermal gradients caused by biological reactions in the brain. [19]
Tractography is performed using data from diffusion MRI. The free water diffusion is termed "isotropic" diffusion. If the water diffuses in a medium with barriers, the diffusion will be uneven, which is termed anisotropic diffusion. In such a case, the relative mobility of the molecules from the origin has a shape different from a sphere.