Figure 2

Apertures shapes created for salvage craniospinal irradiation. On the top row, for case 1, the whole brain apertures with a small block over the optic chiasm are shown on the left, and on the right, the inverse aperture to irradiate the target lateral to the optic chiasm. On the bottom row, for case 2, the whole brain apertures with a block over the brainstem are shown on the left, and on the right, the inverse aperture to irradiate the target lateral to the previously irradiated brainstem surface. Aperture outlines have been enhanced for visibility.