Optic neuritis: MR imaging with combined fat- and water-suppression techniques

Area of Science:

• Radiology
• Neuroimaging
• Ophthalmology

Background:

• Optic neuritis diagnosis relies on clinical criteria and evoked potentials.
• Magnetic resonance imaging (MR) plays a crucial role in visualizing optic nerve inflammation.
• Current MR techniques may have limitations in fully characterizing optic neuritis.

Purpose of the Study:

• To evaluate the diagnostic benefits of combined fat- and water-suppressed T2-weighted MR images for optic neuritis.
• To compare the efficacy of different MR sequences in detecting optic nerve abnormalities.

Main Methods:

• MR imaging was performed on 18 patients with optic neuritis using a 1.5-T unit.
• Three coronal sequences were used: short inversion time inversion recovery (SIR), selective partial inversion-recovery (SPIR) T2-weighted, and SPIR-fluid-attenuated inversion recovery (FLAIR).
• Imaging was conducted within 4 weeks and between 3-6 months post-diagnosis.

Main Results:

• Neuritic segments were identified in all symptomatic nerves.
• The SPIR-FLAIR sequence showed significantly greater extent of neuritic involvement (P < .01).
• SPIR-FLAIR yielded significantly higher contrast ratios and improved visualization of optic nerve atrophy in chronic cases (P < .001).

Conclusions:

• The SPIR-FLAIR sequence demonstrates significant advantages for diagnosing optic neuritis.
• This technique enhances the visualization of active inflammation and chronic changes in the optic nerve.
• SPIR-FLAIR represents an advancement over existing MR methods for optic neuritis assessment.