What ipsilateral lung constraints if any do you utilize for SBRT and or hypofractionated RT in the lungs?  

Following up to this question, I wanted to see if there are any new thoughts on this. I think most rad oncs who I have asked, do not really utilize an ipsilateral lung constraint for SBRT or hypofractionated 60/15 style plans.  I was wondering if this might be related to old school rules of thu...