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Quantitative diffusion-tensor anisotropy brain MR imaging: normative human data and anatomic analysis.

J S Shimony1, R C McKinstry, E Akbudak

  • 1Mallinckrodt Institute of Radiology, St Louis, MO, USA. shimonyj@npg.wustl.edu

Radiology
|September 9, 1999
PubMed
Summary
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Quantitative diffusion anisotropy magnetic resonance (MR) imaging rapidly reveals subtle white matter (WM) anatomy. Different white matter types show distinct, reproducible anisotropy differences, offering insights into brain structure.

Area of Science:

  • Neuroimaging
  • Quantitative MRI
  • Diffusion Tensor Imaging

Background:

  • Conventional MRI has limitations in visualizing subtle white matter (WM) anatomy.
  • Quantitative diffusion anisotropy (DA) magnetic resonance (MR) imaging offers potential for enhanced anatomical detail.

Purpose of the Study:

  • To acquire normative human cerebral data using quantitative DA MR imaging.
  • To evaluate the anatomical information provided by quantitative DA MR imaging.

Main Methods:

  • Acquired whole-brain quantitative DA MR images in 13 healthy adults using echo-planar imaging.
  • Employed a combination of tetrahedral and orthogonal gradient encoding for rapid acquisition (approx. 1 minute).
  • Assessed WM anatomy visually and measured anisotropy values, comparing different anisotropy measures.

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Main Results:

  • DA MR images revealed detailed WM features not visible on conventional MR images, including external capsule and thalamic substructures.
  • Significant and reproducible anisotropy differences were observed across various brain regions.
  • Anisotropy values (A sigma) were highest in commissural WM, followed by projection and association WM, correlating with edema resistance.

Conclusions:

  • Quantitative DA MR imaging is a rapid technique capable of demonstrating subtle WM anatomy.
  • Distinct histological types of WM exhibit significant and reproducible anisotropy differences.