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Quantification of Optic Nerve Cross Sectional Area on MRI: A Novel Protocol using Fiji Software
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Improved optic nerve visualization and treatment planning through a dedicated optic nerve MRI protocol.

Kyle C Wu1,2, Jeffrey P Guenette3, Raymond Y Huang3

  • 11Department of Neurosurgery, The Ohio State University Wexner Medical Center, Columbus, Ohio.

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|April 1, 2024
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A new optic nerve MRI protocol enhances visualization of the optic nerve and surrounding structures. This advanced imaging improves the detection and treatment planning for optic nerve pathology.

Keywords:
endoscopic endonasal surgeryoptic canaloptic nerve decompressionoptic nerve sheathskull base

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Area of Science:

  • Neuroradiology
  • Ophthalmology Imaging

Background:

  • Accurate delineation of optic nerve anatomy and pathology is crucial for effective treatment planning.
  • Conventional MRI protocols may have limitations in visualizing the optic nerve and surrounding cerebrospinal fluid (CSF) sheath.

Purpose of the Study:

  • To describe and evaluate an innovative, dedicated magnetic resonance imaging (MRI) protocol for the optic nerve.
  • To assess the protocol's efficacy in delineating optic nerve anatomy and adjacent pathology.

Main Methods:

  • A dedicated optic nerve MRI protocol was developed and applied to 22 patients.
  • Image acquisition included T2-weighted and fat-suppressed T1-weighted gadolinium-enhanced sequences, acquired both perpendicular and parallel to the optic nerve axis.
  • Analysis focused on imaging, surgical strategy, and patient outcomes.

Main Results:

  • The dedicated protocol provided enhanced visualization of the optic nerve, its CSF sheath, and local pathology.
  • The 'CSF ring' sign effectively contrasted normal tissue from compressive pathology.
  • Longitudinal tracking of tumors along the nerve was facilitated by parallel imaging, aiding treatment planning.

Conclusions:

  • The presented optic nerve MRI protocol is user-friendly and offers superior cross-sectional and longitudinal visualization.
  • Improved visualization enhances radiological evaluation and optimizes treatment planning for optic nerve lesions.