Target Volume Determination 2015

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