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Diffusion tensor imaging (DTI) reveals microstructural differences in the optic nerve (ON) of patients with optic atrophy (OA). DTI measures significantly correlate with retinal nerve fiber layer (RNFL) thickness, suggesting its clinical utility.

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Area of Science:

  • Neuroimaging
  • Ophthalmology
  • Medical Physics

Background:

  • Optic atrophy (OA) involves progressive damage to the optic nerve (ON), leading to vision loss.
  • Quantitative assessment of ON microstructural integrity in OA is crucial for understanding disease progression and developing effective treatments.
  • Diffusion tensor imaging (DTI) offers a non-invasive method to probe tissue microstructure by measuring water diffusion patterns.

Purpose of the Study:

  • To quantitatively evaluate the microstructural properties of the optic nerve (ON) in vivo using diffusion tensor imaging (DTI) in patients with unilateral optic atrophy (OA).
  • To determine the association between DTI-derived microstructural parameters of the ON and the retinal nerve fiber layer (RNFL) thickness in the optic nerve head (ONH).
  • To explore the potential of DTI as a clinical tool for assessing ON damage in OA.

Main Methods:

  • Six patients with unilateral OA and 11 healthy controls underwent DTI scans.
  • Optic nerves (ON) were tracked from the optic nerve head (ONH) to the orbital apex.
  • Key DTI metrics including fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity (RD) were computed. Retinal nerve fiber layer (RNFL) thickness was measured using optical coherence tomography (OCT).

Main Results:

  • Patients with OA exhibited significantly lower FA and higher MD and RD in their atrophic ON compared to non-affected and control ONs.
  • Axial diffusivity (AD) did not show significant differences between groups.
  • FA, RD, and MD demonstrated significant correlations with RNFL thickness, with FA showing the strongest association (R² = 0.936, P < 0.001).

Conclusions:

  • DTI can quantitatively characterize microstructural alterations in the optic nerve (ON) associated with optic atrophy (OA).
  • The strong correlation between DTI metrics (especially FA) and RNFL thickness highlights DTI's potential as a sensitive biomarker for evaluating ON health and damage.
  • These findings support the clinical applicability of DTI for non-invasively assessing the optic nerve in patients with optic atrophy.