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“The Target Volume”
1978 ICRU29
1993 ICRU50
GTV
CTV
PTV
Organs at risk
Organs at risk
1999 ICRU62
GTV
CTV ITV PTV
2004 ICRU71
GTV-T
CTV-T (ITV) PTV-T
GTV-N
CTV-N
PTV-N
GTV-M
CTV-M
PTV-M
Volumes
… variations in delineation …
… a lot of work on imaging …
… “dose sculpting” is more readily done …
… the “dose-bath” might be a problem …
…ICRU…
OAR PRV
OR PRV