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The nested outlines a radiation plan is built on: the visible tumour (GTV), the tumour plus the tissue likely to hold microscopic spread (CTV), and a further margin for daily movement and setup error (PTV).
The gross tumour volume is what imaging and examination show; the clinical target volume adds the margin of suspected microscopic disease and, in many cancers, the lymph node regions at risk; the planning target volume adds a geometric margin so that the CTV receives the dose despite setup and organ motion. Image guidance, motion management and adaptive radiotherapy all work by allowing the PTV margin to shrink.
Showing the technology this term belongs to: IMRT / IGRT (modern external beam).
Shares Volumetric modulated arc therapy (VMAT), Adaptive radiotherapy (online replanning), IMRT / IGRT (modern external beam) and the tag radiation-wave1.
Shares Adaptive radiotherapy (online replanning), IMRT / IGRT (modern external beam) and the tag radiation-wave1.
Shares Adaptive radiotherapy (online replanning) and the tag radiation-wave1.
Shares IMRT / IGRT (modern external beam) and the tag radiation-wave1.
Shares IMRT / IGRT (modern external beam) and the tag radiation-wave1.
Shares IMRT / IGRT (modern external beam) and the tag radiation-wave1.
Shares IMRT / IGRT (modern external beam) and the tag radiation-wave1.
Shares IMRT / IGRT (modern external beam) and the tag radiation-wave1.