Peds Whole Lung RT How low of a dose (%) can I go on the PTV in the region of the heart in region? 1 (90-95%?) 2 (90-93%?) What mean heart dose are you looking for? Please see refs next few pages ‘R21 trial?’ AAPM Talk from one of the authors of CS-IMRT sparing ‘R21’ trial group Breast Dmean = 10 Thyroid Dmean = 5 Breast Dmean Around 14/16.5 = 85%? A little high? AAMD 2021 Talk I guess try to stay below this?