Microsoft Word - Scientific Program IGRT 2016 Madrid V3

PTV margins and image guidance

•

PTV margin published recommendations :

0.6-4.0cm

•

Large margin still recommended :

- because of unpredictable organ motion

- Substantial tumor regression

Up to 1.5-2cm if (good quality) soft tissue daily

image guidance

0.7cm for nodal CTV

- Larger margins if bone matching alone

03/01/13