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Diffusion Imaging in the Rat Cervical Spinal Cord
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Thoracic and lumbar spinal cord diffusion tensor imaging in dogs.

John F Griffin1, Noah D Cohen, Benjamin D Young

  • 1Department of Veterinary Large Animal Clinical Sciences, Texas A&M University, College Station, Texas, USA. jgriffin@cvm.tamu.edu

Journal of Magnetic Resonance Imaging : JMRI
|January 26, 2013
PubMed
Summary

Diffusion tensor imaging (DTI) protocols show good agreement for assessing spinal cord injury in dogs. Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values are reliable across different scanning planes.

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Area of Science:

  • Veterinary Neurology
  • Biomedical Imaging
  • Neuroscience

Background:

  • Diffusion Tensor Imaging (DTI) is increasingly utilized for non-invasive assessment of white matter integrity.
  • Standardization of DTI protocols is crucial for reliable interpretation, especially in preclinical models.
  • The canine spinal cord serves as a valuable model for human spinal cord injury (SCI).

Purpose of the Study:

  • To evaluate and compare four clinically applicable DTI protocols in normal dogs.
  • To assess the agreement of fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values across different DTI protocols.
  • To investigate the influence of DTI protocol parameters on image quality and quantitative metrics.

Main Methods:

  • Seven healthy Dachshund dogs underwent DTI scanning using four protocols (two transverse, two sagittal planes).
  • Protocols varied in diffusion-encoding directions and averages while maintaining identical spatial resolution within each plane.
  • Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) agreement were analyzed using Bland-Altman methods; subjective image quality was compared.

Main Results:

  • Good agreement was observed for FA and ADC values within each imaging plane.
  • Fractional anisotropy (FA) demonstrated the best precision and least bias among the analyzed metrics.
  • No significant differences in subjective image quality were detected between protocols within the same plane.
  • FA and ADC values were slightly elevated cranial to the lumbar intumescence compared to within it.

Conclusions:

  • DTI protocols analyzed provide reliable and reproducible quantitative metrics for the canine spinal cord.
  • DTI is a promising imaging tool for evaluating spinal cord injury in dogs, particularly in the context of intervertebral disk herniation.
  • This study supports the use of canine models with DTI for preclinical research of human SCI.