Microsoft Word - Scientific Program IGRT 2016 Madrid V3

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Margins in lung hypo (3 x 18 Gy)
Systematic Random
Delineation 2 mm SD -
Registration/couch shift 1.5 mm SD 1.5 mm SD
Intra-fraction motion 1.5 mm SD 1.5 mm SD
Total 3 mm SD 2.2 mm SD
Margin A=10 mm 7 mm + 0 mm
Margin A=20 mm 7 mm + 2 mm
p p M s s s 84.0 ) ( 84.0 5.22 2  + +S = sp  7.8 mm
Ensures 80% isodose encompasses GTV 90% of time in lung