OpticNrv_L

Category: Nerve

Description: Optic nerve

Model: HeadNeckCNS

Model Information

Metrics

Average Volume (cc)

0.56

Average

Dice Coefficient

0.69

Average

0.7 (Median)

95th Percentile Hausdorff Distance (mm)

3.16

Average

2.55 (Median)

Median Distance to Conformity (mm)

3.53

Average

3.6 (Median)

Undercontouring MDC (mm)

1.61

Average

1.43 (Median)

Overcontouring MDC (mm)

1.91

Average

1.94 (Median)

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