Gynae BT 2017
ITV and PTV
ITV: Internal variations
Position, size and shape of CTV • Tumour shrinkage • Organ movement • Organ deformation
PTV: External variations Beam positioning
Patient set-up (e.g. uncertainties when setting up according to skin marks)
If no considerable internal variations are present Expansion may be performed directly from CTV to PTV
ITV and PTV margins are not directly “additive”
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