TVD 2016

Target volumes – PTV

• ICRU 62 suggested 2 components to the PTV: Internal Margin IM – for eg organ movement Setup Margin SM – for set‐up inaccuracies

CTV + “Internal Margin” (IM) = ITV  * ITV + “Set‐up Margin” (SM) = PTV 

• These are useful to remind about the basis of errors

* ITV= Internal Target Volume