OpticNrv_R
Category:
Nerve
Description:
Optic nerve
Model: Ocular_Structures
MR
Model Information
Metrics
Dice Coefficient
0.43
Average
Delineation Information
Guidelines
Taken from Eekers DBP, Di Perri D, Roelofs E, Postma A, Dijkstra J, Ajithkumar T, et al. Update of the EPTN atlas for CT- and MR-based contouring in Neuro-Oncology. Radiother Oncol 2021;160:259–65. https://doi.org/10.1016/j.radonc.2021.05.013.
Method
Manual. The optic nerve (2–5 mm thick) is delineated from the posterior edge of the eyeball, through the bony optic canal, where it narrows slightly, to the optic chiasm. Close to the optic chiasm, an MR scan (T1 weighted) is recommended for better delineation of the optic nerve
Structure Boundaries
Cranial Boundary
Topmost slice where the optic nerve is visisble.
Caudal Boundary
Inferior most slice where the optic nerve is visible.
Medial Boundary
Outer contour of the optic chiasm
Lateral Boundary
Outer contour of the optic chiasm
Ventral Boundary
Posterior edge of the eyeball
Dorsal Boundary
Optic chiasm