tensor
A mathematical object describing the three-dimensional characteristics of water diffusion in brain tissue.
Full Definition
In diffusion imaging, a tensor is a 3x3 matrix that characterizes the magnitude and directionality of water diffusion at each voxel. The diffusion tensor provides information about tissue microstructure, including fiber orientation and integrity. From the tensor, various scalar measures can be derived including fractional anisotropy, mean diffusivity, and principal eigenvectors. Understanding tensor properties is essential for interpreting DTI data and assessing white matter pathology in neurological conditions.
Usage
Usage note: In neuroimaging contexts, typically refers specifically to diffusion tensor; clarify context when other tensor types are discussed
In Context
- "The diffusion tensor at each voxel was decomposed into eigenvalues and eigenvectors for tract reconstruction." — White matter analysis methodology
- "Tensor-derived metrics revealed altered white matter microstructure in the corpus callosum." — Multiple sclerosis research findings