389 / 1311
ICRU
(International Comission on Radiation Units and Mesuraments
) 50 and 62
CTV margin to create PTV:
- geometrical errors
- internal motion of CTV
- treatment technique (beam orientation)
- intra and interfractional errors (patient fixation, daily
setup errors)
OAR margin to create PRV: movements of the OAR due to the change
in size and setup uncertainities
CTV
→
PTV (Planning Target Volume)
OAR
→
PRV
(Planning Organs at Risk Volume)
5 mm