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Table 2 Planning constraints

From: A scoring system predicting acute radiation dermatitis in patients with head and neck cancer treated with intensity-modulated radiotherapy

Structure Index Objectives Acceptable
PTV70Gy D50% (%) 100% 98–103%
PTV70Gy D98% (%) > 93% > 90%
PTV70Gy D2% (%) < 105% < 115%
PTV63Gy D90% (Gy) 100% (63 Gy) > 97% (61.11Gy)
PTV63Gy D50% (Gy) < 105% (66.15 Gy) < 108% (68.04Gy)
PTV56Gy D90% (Gy) 100% (56 Gy) > 97% (54.32Gy)
PTV56Gy D50% (Gy) < 105% (58.8 Gy) < 108% (60.48Gy)
CTV70Gy D95% (%) > 100% > 98%
CTV63Gy D95% (Gy) > 100% (63 Gy) > 98% (61.74Gy)
CTV56Gy D95% (Gy) > 100% (56 Gy) > 98% (54.88Gy)
GTV D95% (%) > 100% > 98%
Spinal cord Max 45 Gy 50 Gy
Brain stem Max 54 Gy 60 Gy
Contralateral parotid grand V30Gy < 50% < 50%
Oral cavity Mean 30 Gy < 40 Gy
  1. Abbreviations: DXX% dose to xx% of the organ; V30Gy volume receiving 30 Gy