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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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High resolution diffusion tensor imaging of human nerves in forearm.

Yuxiang Zhou1, Ponnada A Narayana, Manickam Kumaravel

  • 1Diagnostic and Interventional Imaging, University of Texas Health Science Center at Houston, Houston, Texas, USA.

Journal of Magnetic Resonance Imaging : JMRI
|November 19, 2013
PubMed
Summary

High spatial resolution diffusion tensor imaging (DTI) clearly visualizes and quantifies forearm nerves. This advanced DTI technique offers superior detail for median, ulnar, and superficial radial nerves, aiding in pathology identification.

Keywords:
diffusion tensor imagingfractional anisotropyhuman forearmmean diffusivityperipheral nerves

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Area of Science:

  • Medical Imaging
  • Neuroimaging
  • Radiology

Background:

  • Peripheral nerve imaging in the forearm presents challenges for conventional MRI sequences.
  • Diffusion Tensor Imaging (DTI) offers advanced tissue microstructural information.

Purpose of the Study:

  • To implement and evaluate high spatial resolution DTI for peripheral nerve visualization and quantification in the human forearm.
  • To compare DTI's effectiveness against other MRI sequences for nerve delineation.

Main Methods:

  • A high spatial resolution DTI sequence (1.0 × 1.0 × 3.0 mm³) was optimized for forearm imaging.
  • T1- and T2-weighted sequences with fat saturation and STIR were used for comparison.
  • DTI-derived indices including fractional anisotropy (FA) and mean diffusivity (MD) were calculated.

Main Results:

  • High resolution DTI unequivocally visualized the ulnar, superficial radial, and median nerves.
  • DTI provided clearer delineation of forearm nerves compared to conventional sequences.
  • Significant differences in DTI measures (FA, MD, λ//, λ⊥) were found among the three nerves.
  • A strong correlation was observed between nerve size on FA maps and T2-weighted images.

Conclusions:

  • High spatial resolution DTI is superior for identifying and quantifying forearm nerves.
  • Consistent visualization of small nerves and branches is achievable with this DTI technique.
  • Normative DTI data may assist in diagnosing peripheral nerve pathologies.