Figure 1

Illustration of the dose-volume histogram of tomotherapy planning for a patient with a T4N1M0 squamous cell carcinoma extending from the cricoid cartilage to the lower third of the esophagus. The cervical, mediastinal, and celiac lymph nodes were treated to 45 Gy in 180 Gy/fraction while the gross tumor was treated with an integrated boost technique to 50 Gy in 2 Gy/fraction. The black line illustrates the total lung dose. Despite the large tumor size, the volume of lungs treated to 20 Gy (V20), 15 Gy (V15), 10 Gy (V10) and 5 Gy (V5) was 18%, 25%, 38%, and 50%, respectively. Maximum spinal cord dose and brain stem dose was 37 Gy (dark blue line) and 27 Gy (light green), respectively. The pink line illustrates the radiation dose to the cardiac ventricles. The blue and light maroon line illustrates the dose to the right and left parotid respectively.