Table 2.

Dose constraints used in treatment planning for RA₅₀ and RA_62.5 radiation therapy plans

Dose-volume	Constraint
PTV1 (50 Gy)	V95% (47.5 Gy) > 95% Dmax (0.1 cc) < 107% (53.5 Gy)
PTV2 (GTV + 0.5 cm) (62.5 Gy)	V95% (59.375 Gy) > 95% Dmax (0.1 cc) < 107% (66.875 Gy)
Lung	Mean dose < 20 Gy V20Gy < 25%
Heart	Mean dose < 25 Gy V30Gy < 45%
CordPRV	Dmax (0.1 cc) < 40 Gy (45 Gy permitted)

Abbreviations: CordPRV = Cord planning organ at risk volume; Dmax = maximum dose; RA₅₀ = RapidArc plan to 50 Gy; RA_62.5 = RapidArc plan with boost to 62.5 Gy; V_30Gy = volume receiving 30 Gy.