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Table 2 IMRT planning goals and constraints

From: Optimal beam arrangement for pulmonary ventilation image-guided intensity-modulated radiotherapy for lung cancer

Structure Constraint
PTV Min. dose ≥65 Gy
Max. dose ≤70 Gy
Volume receiving ≥66 Gy more than 95%
Total lung Dmean 20 Gy
Volume receiving ≥20 Gy less than 30%
Volume receiving ≥30 Gy less than 20%
Spinal cord Max. point dose ≤40 Gy
Heart Volume receiving ≥40 Gy less than 100%
  Volume receiving ≥45 Gy less than 67%
Volume receiving ≥60 Gy less than 33%
Esophagus Volume receiving ≥55 Gy less than 35%
Skin Max. dose ≤70 Gy
Functional lunga Volume receiving ≥20 Gy less than 20%
  Volume receiving ≥10 Gy less than 35%
  1. Abbreviations: IMRT Intensity-modulated radiotherapy, PTV Planning target volume, Min. Minimum, Max. Maximum, D mean Mean dose. afor functional-constrained plan.