Figure 2
From: Proton radiotherapy for pediatric tumors: review of first clinical results
Axial and sagittal isodose distributions comparing intensity-modulated proton therapy (IMPT) (A) and intensity-modulated radiotherapy (IMRT) (B). For IMPT plan 3 beam angles were used (1 vertex, 2 symmetric lateral off-axis vertex). For IMRT plan 7 equidistant and coplanar beams were used. PTV (white), right temporal lobe (yellow), left temporal lobe (green), brainstem (pink), left eye (light blue), right eye (light green), chiasma (blue) are outlined. The IMPT plan improved sparing of the temporal lobes, orbital structures and both optic nerves. The integral dose to the brain tissue is decreased with IMPT.