Fig. 1

Isodose lines for one VMAT patient on two representative axial views as well as sagittal and coronal views. a IMRT plan b VMAT plan. The target planning volumes are in colorwash: GTV (maroon), bPTV (dark blue), CTV (gold), PTV (aquamarine). The brainstem is outlined in black, the cochleae in red colorwash, and the hippocampi in green