title: Magnetic resonance imaging of the canine optic nerve.
abstract: We describe the magnetic resonance (MR) imaging aspects of normal canine optic nerve, the diameter of the optic nerve as measured on MR images, and optimal MR sequences for the evaluation of the optic nerve using a 0.2T MR unit. Three millimeter contiguous slides of the normal canine orbital region were acquired in transverse and dorsal oblique planes using a variety of tissue weighting sequences. It was apparent that detailed anatomic assessment of the optic nerve can be performed with low-field MR imaging, but none of the sequences provided unequivocal superior image quality of the optic nerve. The mean diameter of the optic nerve sheath complex was 3.7mm and of the optic nerve 1.7 mm. The intraorbital and intracanalicular parts of the optic nerve are consistently visible and differentiation between the optic nerve and optic nerve sheath complex is possible using low-field MR systems.
authors.affiliation: Division of Diagnostic Imaging, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 108, 3508 TD Utrecht, The Netherlands. S.Boroffka@vet.uu.nl
authors.forename: Susanne A E B
authors.initials: SA
authors.lastname: Boroffka
authors.forename: Christiane
authors.initials: C
authors.lastname: Görig
authors.forename: Eduardo
authors.initials: E
authors.lastname: Auriemma
authors.forename: Maartje H A C
authors.initials: MH
authors.lastname: Passon-Vastenburg
authors.forename: George
authors.initials: G
authors.lastname: Voorhout
authors.forename: Paul Y
authors.initials: PY
authors.lastname: Barthez
mesh_terms: D000818:Animals; D004285:Dogs / Q000033:anatomy & histology*; D008279:Magnetic Resonance Imaging / Q000379:methods / Q000662:veterinary*; D009186:Myelin Sheath; D009900:Optic Nerve / Q000033:anatomy & histology*; D012016:Reference Values