Long echo time STIR sequence MRI of optic nerves in optic neuritis

Area of Science:

• Neuroimaging
• Ophthalmology
• Radiology

Background:

• Optic neuritis (ON) is an inflammatory condition affecting the optic nerve.
• Accurate detection of optic nerve lesions is crucial for diagnosis and management of ON.
• Conventional MRI sequences may not fully capture the extent of optic nerve damage in ON.

Purpose of the Study:

• To compare the effectiveness of a long echo time short tau inversion recovery (LTE-STIR) MRI sequence with a conventional short echo time STIR (STE-STIR) sequence for detecting optic nerve lesions in patients with acute and previous optic neuritis.
• To evaluate the sensitivity of LTE-STIR in identifying optic nerve abnormalities.

Main Methods:

• MRI scans of the optic nerves were performed on 13 patients with acute ON and 13 with previous ON.
• Conventional STE-STIR (22 ms echo time) and LTE-STIR (80 ms echo time) sequences were utilized.
• Clinical features, visual fields, and visual evoked potentials were used for assessment.

Main Results:

• The LTE-STIR sequence detected abnormalities in 92.8% of acute ON nerves and 94.1% of previous ON nerves, compared to 78.5% and 58.8% with STE-STIR, respectively.
• Optic nerve lesions were significantly longer when visualized with the LTE-STIR sequence in both acute and previous ON.
• LTE-STIR demonstrated higher sensitivity in detecting optic nerve lesions.

Conclusions:

• The LTE-STIR MRI sequence is more sensitive than conventional STE-STIR for detecting optic nerve lesions in patients with optic neuritis.
• LTE-STIR provides a more comprehensive assessment of lesion extent in ON, aiding in diagnosis and monitoring.
• This advanced MRI technique enhances the evaluation of optic nerve pathology in ON.