Table 1.

Dose constraints for organs at risk, OARs. ${\mathrm{V}}_{20}$ represents the percent volume of lung tissue that receives 20 Gy

OAR	Volume	Maximum Total Dose
Spinal Cord	Any Point	26 Gy
Esophagus	Any Point	30 Gy
Heart	Any Point	34 Gy
Trachea	Any Point	34.8 Gy
Rib	Any Point	40 Gy
Lung	${\mathrm{V}}_{20}$ $<10\%$