A side note: setting up according to landmarks
Spine vs Carina
Higgins et al (IJROBP 2009):
feasible, better inter-observer
agreement with match on the carina
Lavoie et al (IJROBP 2012):
especially node coverage is improved
Schaake et al (IJROBP 2014):
reduced LN margins if match on carina
instead of bones
Spine match
Carina match