Structure

Constraint

Lungs

V20 ≤ 35%

Heart

Mean dose < 26 Gy

V30 < 46%

Spinal Cord

Dmax < 45 Gy

45 Gy to whole SC with not more than 2% of SC > 50 Gy

Whole Liver

Mean dose < 32 - 30 Gy