Table 1.

Normal organ constraints used for normal tissue-sparing IMRT lung plans after May 2012.

Lungs	Esophagus	Spinal cord	Heart	Brachial plexus
Dmean <20 Gy	Mean <34 Gy	Dmax <45 Gy	D60 <33%	Dmax <66 Gy
V20 <37%	Dmax <100% Rx (when feasible)	Spinal canal + 5 mm <50 Gy	D45 <66%
V10 <50%			D40 <100%
V5 <65%