Figure 3.

Illustration of the effectiveness of Tomotherapy to decrease radiation dose to both parotids in a patient with locally advanced laryngeal cancer and negative neck nodes on PET-CT scan (T3N0M0). The tumor bed and bilateral levels II-IV neck nodes were treated to 70 Gy (red) and 56 Gy (yellow) respectively. Despite the close proximity of the parotid glands to the 56 Gy isodose line, mean parotid dose was 11.2 Gy for the right and 12.7 Gy for the left