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Related Experiment Video

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Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging
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Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging

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Probing mouse brain microstructure using oscillating gradient diffusion MRI.

Manisha Aggarwal1, Melina V Jones, Peter A Calabresi

  • 1Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Magnetic Resonance in Medicine
|May 19, 2011
PubMed
Summary
This summary is machine-generated.

Oscillating gradient spin echo MRI reveals novel brain tissue contrasts and frequency-dependent diffusion changes. This technique shows potential for enhanced imaging in demyelination models, complementing standard diffusion MRI.

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Area of Science:

  • Neuroimaging
  • Biophysics
  • Diffusion MRI

Background:

  • Diffusion tensor imaging (DTI) provides insights into brain microstructure.
  • Conventional pulsed gradient spin echo (PGSE) DTI has limitations in resolving certain tissue properties.

Purpose of the Study:

  • To investigate the utility of oscillating gradient spin echo (OGSE) diffusion MRI for generating novel tissue contrasts in the mouse brain.
  • To explore frequency-dependent diffusion changes in major brain structures and in a demyelination model.

Main Methods:

  • Acquisition of high-resolution diffusion tensor images using both PGSE and OGSE sequences in mouse brains.
  • Analysis of frequency-dependent changes in apparent diffusion coefficient (ADC) and fractional anisotropy (FA).
  • Comparison of OGSE-derived contrasts with Nissl and DAPI staining, and assessment in a cuprizone-induced demyelination model.

Main Results:

  • OGSE tensor imaging revealed frequency-dependent diffusion changes in major brain structures.
  • Novel tissue contrasts, resembling cytoarchitectural features, were observed in the hippocampus, cerebellum, and cerebral cortex.
  • Elevated frequency-dependence of perpendicular diffusivity (λ(⊥)) was detected in demyelinated corpus callosum during acute stages of cuprizone treatment, correlating with microglial infiltration and axonal damage.

Conclusions:

  • OGSE-based diffusion MRI offers unique tissue contrasts complementary to conventional PGSE-based DTI.
  • The observed frequency-dependent contrasts may relate to specific cytoarchitectural features of brain tissue.
  • OGSE MRI shows promise for characterizing microstructural changes in demyelination and other neurological conditions.