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High-Resolution 7T MR Imaging of the Trochlear Nerve
T Kumar1, G M Virador1, P Brahmbhatt1
1From the Department of Radiology, Mayo Clinic, Jacksonville, Florida.
AJNR. American Journal of Neuroradiology
|January 19, 2023
Summary
Ultra-high-resolution 7T MRI reliably visualizes the trochlear nerve (cranial nerve IV) in 100% of cases. This advanced imaging technique aids in identifying normal anatomy and diagnosing trochlear nerve pathology.
Area of Science:
- Neuroradiology
- Neuroimaging
- Anatomy
Background:
- The trochlear nerve (cranial nerve IV) presents challenges for identification on conventional MRI.
- Advancements in 7 Tesla (7T) MRI offer enhanced signal-to-noise ratio for improved visualization of small neuroanatomical structures.
Purpose of the Study:
- To evaluate the effectiveness of an ultra-high-resolution 7T MRI protocol for identifying the trochlear nerve.
- To assess the normal anatomy of the trochlear nerve using 7T MRI.
Main Methods:
- Review of coronal high-resolution 2D T2-weighted TSE images from a 7T epilepsy protocol in 50 subjects.
- Independent radiologist assessment of trochlear nerve visualization across its brainstem, cisternal, tentorial, and cavernous segments.
- Documentation of nerve visibility frequency and anatomical details, with joint review for disagreements.
Main Results:
- The trochlear nerve was identified in all 100 nerves reviewed (50 subjects) across at least two segments.
- Brainstem origins and cisternal segments were visualized in 65% and 93% of nerves, respectively.
- The nerve was consistently identified at the trochlear groove (100%) and in the cavernous sinus (74%).
Conclusions:
- Coronal high-resolution 2D TSE at 7T reliably visualizes the trochlear nerve throughout its entire course.
- This 7T MRI protocol shows significant promise for imaging patients with suspected trochlear nerve pathology.
