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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Multi-directional anisotropy from diffusion orientation distribution functions.

Ek T Tan1, Luca Marinelli, Jonathan I Sperl

  • 1GE Global Research, Niskayuna, New York, USA.

Journal of Magnetic Resonance Imaging : JMRI
|April 23, 2014
PubMed
Summary
This summary is machine-generated.

A new metric, multi-directional anisotropy (MDA), shows superior sensitivity to complex white matter structures compared to fractional anisotropy (FA). This advanced measure may improve disease assessment in brain regions with intricate fiber orientations.

Keywords:
diffusion imagingdiffusion spectrum imagingdiffusion tensor imagingfractional anisotropymulti-directional anisotropy

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Area of Science:

  • Neuroimaging
  • Diffusion MRI
  • White Matter Tractography

Background:

  • Fractional anisotropy (FA) is a common diffusion MRI metric for quantifying white matter microstructure.
  • FA's sensitivity can be limited in regions with complex, crossing, or fanning white matter fibers.
  • Advanced metrics are needed to better characterize anisotropy in multi-directional diffusivity.

Purpose of the Study:

  • To evaluate a novel multi-directional anisotropy (MDA) metric.
  • To compare MDA's performance against fractional anisotropy (FA) and generalized FA (GFA).
  • To assess MDA's sensitivity to multi-directional diffusivity in simulated and in vivo data.

Main Methods:

  • Defined MDA from the orientation distribution function (ODF) and derived its analytical relation to FA.
  • Performed simulations of single and crossed fibers using compressed-sensing-accelerated diffusion-spectrum-imaging (CS-DSI).
  • Acquired in vivo brain imaging data from eight healthy subjects using CS-DSI for comparison.

Main Results:

  • MDA demonstrated equivalence to FA in simulated single-direction fibers.
  • MDA provided superior differentiation of anisotropy in simulated crossed fibers compared to FA and GFA.
  • In vivo analysis revealed MDA's superior relative accuracy in crossed fiber regions over FA and GFA (P < 0.05).

Conclusions:

  • Multi-directional anisotropy (MDA) offers a potentially superior measure of white matter fiber anisotropy.
  • MDA may enhance the assessment of neurological diseases affecting complex white matter pathways.
  • This metric could improve diagnostic capabilities in neuroimaging studies.