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Related Experiment Video

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Retrieving neuronal orientations using 3D scanning SAXS and comparison with diffusion MRI.

Marios Georgiadis1, Aileen Schroeter2, Zirui Gao3

  • 1Institute for Biomedical Engineering, ETH Zurich, Zurich, Switzerland; Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, USA; Department of Radiology, Stanford Medicine, USA.

Neuroimage
|October 1, 2019
PubMed
Summary

3D scanning small-angle X-ray scattering (3D sSAXS) provides micrometer-resolution myelin orientation maps in brain tissue. This method complements diffusion MRI (dMRI) by offering orthogonal validation and detailed microstructural insights.

Keywords:
3D scanning SAXSBrain X-ray scatteringDiffusion MRIMyelin sheathNeuronal orientationODF validation

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Area of Science:

  • Neuroimaging
  • Biophysics
  • Materials Science

Background:

  • Diffusion MRI (dMRI) is limited by spatial resolution and requires structural validation.
  • Existing ex vivo methods for 3D fiber orientation lack precision and can distort tissue.
  • 3D sSAXS analyzes scattering anisotropy to determine 3D fiber orientations.

Purpose of the Study:

  • To adapt 3D sSAXS for analyzing myelin orientation in brain tissue.
  • To validate dMRI results and provide novel microstructural insights.
  • To develop a method with high sensitivity to myelin and micrometer resolution.

Main Methods:

  • Adapted 3D sSAXS for brain tissue, leveraging myelin's molecular structure.
  • Extended anisotropy characterization from vectors to tensors.
  • Employed Funk-Radon-Transform for converting scattering data to fiber orientations.
  • Generated fiber orientation distribution function (fODF) maps from tensor data.

Main Results:

  • Demonstrated feasibility of 3D sSAXS in thin mouse brain sections with minimal preparation.
  • Obtained voxel-wise second-rank tensors representing fODFs.
  • Showed strong correspondence between 3D sSAXS and dMRI fiber orientations.
  • Highlighted the orthogonality and complementary nature of the two methods.

Conclusions:

  • 3D sSAXS is a viable method for validating microstructural MRI in the brain.
  • The technique offers high sensitivity to myelin sheath orientation and abundance.
  • 3D sSAXS provides novel microstructural insights into the nervous system at micrometer resolution.