Brainstem

0.820 Avg Dice

— Median Dice

— Avg HD95 (mm)

— Avg MDC (mm)

Delineation Information

Modality: CT
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 brainstem is to be contoured on MR images and can be divided into three parts, from cranial to caudal, the midbrain, pons and medulla oblongata. The midbrain is defined from the nigral substance at the cerebral peduncle to the upper border of the pons. The pons is an oval shaped structure on sagittal views, which is easy to discriminate. The caudal limit of the medulla oblongata is the tip of the dens of C2 (i.e., the odontoid peg), which is also the cranial border of the spinal cord; the cranial limit is the ponto-medullary junction. For practical reason the cerebral aqueduct is included until it becomes the 4th ventricle. The brainstem interior is the brainstem surface contour cropped by 2 mm (inner border). The brainstem surface is the brainstem excluding the brainstem interior.