Retina_R
Model: Ocular_Structures
Model Information
Metrics
Average Volume (cc)
Dice Coefficient
95th Percentile Hausdorff Distance (mm)
Median Distance to Conformity (mm)
Undercontouring MDC (mm)
Overcontouring MDC (mm)
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 retina is a neurosensorial membrane of 2–3 mm thickness, located at the posterior part of the eyeball, posterior to the cornea and lens, and is the innermost of the three layers that form the wall of the eyeball (sclera, uvea/choroid and retina). Using a 3 mm brush, it can be delineated on MR as well as CT as a membrane covering the posterior 5/6 of the globe, extending nearly as far as the ciliary body. The anterior border of the retina is between the insertion of the medial rectus muscle and the lateral rectus muscle, posterior to the ciliary body. The optic nerve is excluded from this contour
Structure Boundaries
Cranial Boundary
Superior most slice where the retina is visible.
Caudal Boundary
Inferior most slice where the cornea is visible.
Medial Boundary
The retina is bounded medially by the vitreous cavity
Lateral Boundary
Sclera
Ventral Boundary
The anterior border of the retina is between the insertion of the medial rectus muscle and the lateral rectus muscle, posterior to the ciliary body.