Fig. 1

Planning computed tomography scan with three dimensional reconstruction illustrating both delineation methods for subventricular zone (SVZ). Ipsilateral and contralteral SVZ were contoured as 5 mm expansion along the lateral margins of lateral ventricles. Two delineation methods were used : TH+ method including temporal horns (a), and TH- method excluding them (b). Yellow: bilateral SVZ; Red : Clinical Target Volume