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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Related Experiment Video

Updated: Jun 19, 2026

Diffusion Imaging in the Rat Cervical Spinal Cord
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Detection of Region-specific Fiber Damage within Injured Spinal Cord Using Advanced Diffusion MRI.

Feng Wang, Junzhong Xu, Tung-Lin Wu

    Biorxiv : the Preprint Server for Biology
    |July 9, 2025
    PubMed
    Summary

    Diffusion tensor imaging (DTI) and spherical mean technique (SMT) effectively detect spinal cord injury (SCI) damage. Fractional anisotropy (FA) and axonal volume fraction (Vax) show the most significant changes, offering reliable biomarkers for assessing white matter (WM) injury.

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    Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression
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    Area of Science:

    • Neuroimaging
    • Spinal Cord Injury Research
    • White Matter Integrity

    Background:

    • Spinal cord injury (SCI) causes complex white matter (WM) damage.
    • Accurate detection of region-specific WM damage is crucial for understanding SCI.
    • Diffusion MRI techniques like DTI and SMT offer potential for non-invasive assessment.

    Purpose of the Study:

    • To evaluate diffusion parameters from DTI and SMT for detecting SCI-induced WM damage.
    • To assess the ability of these techniques to identify region-specific and fine-grained tissue alterations.
    • To correlate diffusion parameters with histological findings for validation.

    Main Methods:

    • Diffusion MRI data acquired from monkey cervical spinal cords using a 9.4T scanner.
    • Acquisition before and after a unilateral dorsal column lesion at C5.
    • Analysis using diffusion tensor imaging (DTI) and spherical mean technique (SMT) parametric maps, validated with post-mortem silver staining.

    Main Results:

    • DTI and SMT maps detected regional fiber damage 16 weeks post-injury, aligning with histological findings.
    • WM damage severity followed an order of dorsal > ventral > lateral WM tracts at the lesion site.
    • Fractional anisotropy (FA), axonal volume fraction (Vax), radial diffusivity (RD), and extra axonal transverse diffusivity (Dex) showed significant changes at the lesion site; FA, Vax, and axial diffusivity (AD) changed proximally; AD and FA were sensitive to distal mild damage.

    Conclusions:

    • DTI and SMT provide reliable biomarkers for assessing SCI-induced WM damage.
    • FA demonstrated high sensitivity and specificity for detecting fiber degeneration and demyelination.
    • Vax showed the strongest spatial correlation with histological markers of regional fiber damage, highlighting its utility in SCI assessment.