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Table 2 Contour Definitions.

From: Dosimetric impact of target definitions on normal structures in head and neck cancer

  RTOG 3Dose
PTV-HD (GTV + 1 cm) + 0.3 - 0.5 cm GTV + 0.5 cm
PTV-ID None (GTV + 1 cm) + 0.3 - 0.5 cm
PTV-ED ((GTV + 2 cm) + elective nodes)) + 0.3 - 0.5 cm Elective nodes + 0.3 - 0.5 cm
  1. Abbreviations: RTOG = two dose level plan; 3Dose = three dose level plan; PTV-HD = high dose PTV; PTV-ID = intermediate dose PTV; PTV-ED = elective dose PTV; GTV = gross tumor volume