Orbitofrontal

0.300 Avg Dice

— Median Dice

— Avg HD95 (mm)

— Avg MDC (mm)

Delineation Information

Modality: MR
Guideline: 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 OFC is easier to identify in the coronal plane, halfway through the frontal lobe (3–4 cm from the frontal pole of the brain). At this level, the orbitofrontal cortex runs between the olfactory sulcus medially, and the lateral orbital sulcus laterally. Moving anteriorly, on one hand, the medial border of the OFC fol- lows the olfactory sulcus (thereby excluding the gyrus rectus) until it disappears, then the OFC reaches the midline. On the other hand, the lateral border of the OFC follows the lateral orbital sulcus until it disappears, then the OFC follows an imaginary horizontal line located at the same level, until it reaches the frontal pole of the brain. Moving posteriorly, the medial border of the OFC follows the olfactory sulcus as well, while the lateral border progressively switches from the lateral orbital sulcus to the circular sulcus of the insula.