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Modelling white matter microstructure using diffusion OGSE MRI: Model and analysis choices.

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Summary
This summary is machine-generated.

This study compares white matter microstructure analysis methods using Magnetic Resonance Imaging (MRI). Region-of-interest based analysis with the AxCaliber Frequency-Dependent Extra-Axonal Diffusion (ACD) model and voxel-based analysis with ActiveAx Frequency-Dependent Extra-Axonal Diffusion (AAD) were optimal.

Keywords:
DiffusionMagnetic resonance imagingMathematical modellingOGSEVoxel based analysis

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Area of Science:

  • Neuroscience
  • Biophysics
  • Medical Imaging

Background:

  • White matter (WM) microstructure alterations are key in neurodegenerative diseases.
  • Current ex vivo electron microscopy methods are invasive.
  • Magnetic Resonance Imaging (MRI) offers non-invasive in vivo assessment.

Purpose of the Study:

  • To investigate and compare Region of Interest-based Analysis (RBA) and Voxel-based Analysis (VBA) for WM microstructure.
  • To evaluate four mathematical models: ActiveAx Frequency-Independent Extra-Axonal Diffusion (AAI), ActiveAx Frequency-Dependent Extra-Axonal Diffusion (AAD), AxCaliber Frequency-Independent Extra-Axonal Diffusion (ACI), and AxCaliber Frequency-Dependent Extra-Axonal Diffusion (ACD).
  • To determine optimal combinations for accurate and efficient WM microstructure analysis.

Main Methods:

  • Analysis of two mouse brain samples at 7T and 15.2T MRI.
  • Application of RBA and VBA with AAI, AAD, ACI, and ACD models.
  • Comparison of parameter fitting accuracy, computational load, and analysis time.

Main Results:

  • AAI and AAD models yield single values for parameters like axon diameter and diffusion coefficients.
  • ACI and ACD models provide axon diameter distributions.
  • Region of Interest-based analysis with AxCaliber Frequency-Dependent Extra-Axonal Diffusion (RBA-ACD) and Voxel-based Analysis with ActiveAx Frequency-Dependent Extra-Axonal Diffusion (VBA-AAD) showed optimal performance.

Conclusions:

  • RBA-ACD and VBA-AAD are recommended for accurate and timely white matter microstructure analysis.
  • The study provides a comprehensive comparison to guide researchers in selecting appropriate models and methods.
  • This work advances non-invasive in vivo characterization of white matter in neurological disorders.