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Tissue microstructure features derived from anomalous diffusion measurements in magnetic resonance imaging
Qiang Yu1, David Reutens1, Kieran O'Brien1,2
1Centre for Advanced Imaging, the University of Queensland, Brisbane, Queensland, Australia.
Human Brain Mapping
|October 19, 2016
Summary
This study links anomalous diffusion parameters to axon radius and volume fraction using diffusion-weighted magnetic resonance imaging. These findings advance understanding of white matter structure in brain connectivity and disease.
Area of Science:
- Neuroimaging
- Biophysics
- Human Brain Anatomy
Background:
- White matter pathways are crucial for brain function, with their microstructure influencing magnetic resonance imaging (MRI) diffusion signals.
- Previous research mapped anomalous diffusion parameters but did not link macroscopic variations to microscale influences like axon radius and volume fraction.
Purpose of the Study:
- To connect anomalous diffusion parameters to microscale tissue properties (axon radius and volume fraction).
- To validate these connections using diffusion-weighted MRI and a tissue model.
Main Methods:
- Ex vivo human brain experiments with electron microscopy validation.
- In vivo MRI studies on healthy participants mapping axon radius and volume fraction in the corpus callosum using tractography.
Main Results:
- A clear relationship was established between anomalous diffusion parameters and axon radius/volume fraction.
- Accurate mapping of axon radius trends along the corpus callosum was achieved, consistent with prior observations.
Conclusions:
- Measurements of axon radius and volume fraction show potential for brain connectivity studies.
- These microstructural parameters can aid in understanding white matter's role in brain diseases and disorders.
Keywords:
anomalous diffusionaxon radiuscorpus callosummagnetic resonance imagingmicrostructurevolume fractionMore Related Videos
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