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Related Concept Videos

Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...

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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Published on: July 28, 2013

Investigating axonal damage in multiple sclerosis by diffusion tensor spectroscopy.

Emily T Wood1, Itamar Ronen, Aranee Techawiboonwong

  • 1NeuroImmunology Branch (NINDS), National Institutes of Health, Bethesda, MD 20892, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 11, 2012
PubMed
Summary
This summary is machine-generated.

Diffusion tensor spectroscopy (DTS) shows reduced N-acetylaspartate (NAA) diffusion in multiple sclerosis (MS) patients, indicating axonal damage. This technique may help differentiate axonal injury from other MS pathologies.

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Area of Science:

  • Neuroimaging
  • Biomarkers
  • Multiple Sclerosis Research

Background:

  • Axonal damage is critical in multiple sclerosis (MS) clinical status, impacting prognostication and therapy assessment.
  • In vivo measures of axonal damage are needed for better MS management.
  • Diffusion tensor spectroscopy (DTS) offers a potential method to assess neuronal microstructure.

Purpose of the Study:

  • To investigate the utility of diffusion tensor spectroscopy (DTS) for detecting axonal damage in MS.
  • To measure the diffusion properties of N-acetylaspartate (NAA), a neuronal metabolite, in the normal-appearing corpus callosum of MS patients and healthy controls.

Main Methods:

  • A cross-sectional pilot study was conducted using a 7 tesla MRI scanner.
  • Diffusion of N-acetylaspartate (NAA) was measured in the normal-appearing corpus callosum.
  • 15 MS patients and 14 healthy controls were compared.

Main Results:

  • NAA parallel diffusivity was significantly lower in MS patients compared to controls (p = 0.030).
  • Reduced NAA parallel diffusivity inversely correlated with water parallel diffusivity (p = 0.020) and clinical severity (p = 0.015).

Conclusions:

  • Findings suggest DTS can distinguish MS axonopathy from inflammation, edema, demyelination, and gliosis.
  • DTS's ability to detect reduced NAA diffusion may identify axonal disruption in MS, differentiating it from non-specific water diffusion changes.