Table 1: Radiotherapy planning dose constraints.

Normal Structure

 

Phase 1 (fx 1-7)

Phase 2 (fx 8-13)

Cumulative Plan

Spinal Cord

Maximum Dose

≤ 12.6 Gy

≤ 9.0 Gy

≤ 45 Gy

Normal lung - PTV

Mean Dose

V20

< 5.6 Gy

≤ 8.4%

< 4.0 Gy

≤ 6.0 %

20 Gy

30%

Heart

1/3

2/3

3/3

< 16.8 Gy

< 12.6 Gy

< 11.2 Gy

< 12 Gy

< 9.0 Gy

< 8.0 Gy

< 60 Gy

< 45 Gy

< 40 Gy

Esophagus

1/3

Mean Dose

< 16.8 Gy

≤ 9.5 Gy

< 12.0 Gy

≤ 6.8 Gy

< 60 Gy

≤ 34 Gy

 

V20 = % volume of both lungs minus PTV receiving 20 Gy