fixel-based analysis
Also written as: FBA — Fixel-Based Analysis
Method for analyzing white matter properties at the level of individual fiber populations.
Full Definition
Fixel-based analysis (FBA) is an advanced diffusion MRI analysis framework that enables investigation of white matter properties at the level of individual fiber populations (fixels) within each voxel. Unlike traditional voxel-based approaches that assume single fiber orientations, FBA can resolve and separately analyze multiple crossing fiber populations, providing more specific measures of fiber density, cross-section, and combined metrics. This approach is particularly valuable for studying white matter changes in development, aging, and disease, as it can detect changes that may be missed by conventional DTI metrics. FBA requires high-quality diffusion data and sophisticated preprocessing to accurately estimate fiber orientation distributions.
Usage
Usage note: Hyphenate when used as a compound adjective; distinguish from traditional voxel-based approaches.
In Context
- "Fixel-based analysis revealed reduced fiber density in crossing regions of the corpus callosum." — Advanced diffusion MRI study results
- "The study employed fixel-based analysis to investigate white matter changes with higher specificity than conventional DTI." — White matter analysis methods section