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Table 2 Treatment planning goals and constraints

From: Dosimetric feasibility of 4DCT-ventilation imaging guided proton therapy for locally advanced non-small-cell lung cancer

Structure Constraints
PTV No less than 95% coverage by prescription dose
Total Normal Lung V20 ≤ 37%
  V5 ≤ 60%
  MLD (Mean Lung Dose) ≤ 20Gy
Spinal Cord Dmax < 50 Gy
Heart Dmean< 26 Gy
Esophagus Dmean <34Gy