[Diffusion tensor imaging of the visual pathway in glaucomatous optic nerve atrophy]

Area of Science:

• Neuroscience
• Ophthalmology
• Medical Imaging

Background:

• Glaucoma affects over a million Germans, with many facing blindness due to late diagnosis.
• Current diagnosis focuses on the retina, neglecting the broader visual pathway.
• Glaucoma is a complex neurodegenerative disease affecting the entire visual pathway to the brain.

Purpose of the Study:

• To review novel MRI techniques for assessing the visual pathway in glaucoma.
• To highlight the importance of a holistic, interdisciplinary approach to glaucoma diagnosis and management.
• To explore the potential of advanced imaging in understanding glaucoma subtypes like normal tension glaucoma (NTG).

Main Methods:

• Diffusion tensor imaging (DTI) to assess axonal integrity.
• Calculation of diffusion coefficients: fractional anisotropy (FA), mean diffusivity (MD), and radial diffusivity (RD).
• Voxel-based approaches and FA map generation for clinical integration.

Main Results:

• DTI markers (FA, MD, RD) correlate highly with established ophthalmological examinations.
• Advanced imaging can detect intracranial alterations in early glaucoma stages.
• These techniques may enable earlier diagnosis of NTG and differentiate glaucoma subtypes.

Conclusions:

• Holistic assessment of the visual pathway using novel MRI techniques is crucial for glaucoma.
• Early detection and subtype differentiation, especially for NTG, are enhanced by these methods.
• Interdisciplinary approaches integrating advanced imaging offer new insights into glaucoma pathophysiology.