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Table 2 Dose constraints for inverse planning

From: Normal lung sparing Tomotherapy technique in stage III lung cancer

Priority Structure Constraints
1 PTV D95 ≥ 66 Gy (100%)
D99 ≥ 61.38 Gy (93%)
V72.6 (110%) ≤ 1 cm3
1 P-corda Dmax ≤ 45 Gy
2 Normal lung (both lung - PTV) Dmean ≤ 20 Gy
V5 ≤ 65%
V10 ≤ 45%
V20 ≤ 35%
3 Heart V40 < 100%
V45 < 66%
V60 < 33%
4 Esophagus Dmean ≤ 34 Gy
  1. D V D dose delivered to V% of organ volume, V D absolute or percentage of organ volume receiving D Gy or higher, D max maximum dose, D mean mean dose, OARs organ at risks
  2. aP-cord means the planning volume for the spinal cord which was generated by adding 3~5 mm margin to the actual spinal cord