Figure 5. Primary planning target volume (PTV) (thyroid bed and high risk nodal areas) encompassed by the 95% isodose curve (green), elective nodes by the 78% isodose and the spinal cord is kept below 40 Gy (60% isodose curve). Dose prescribed 58.8 Gy in 28 fractions to the primary PTV and 50 Gy in 28 fractions to the elective neck nodes.