560 / 1031
CTV
PTV (Planning Target Volume)
OAR
PRV (Planning Organs at Risk Volume)
5 mm
ICRU
(International Comission on Radiation Units and Mesuraments
) 50 and 62
CTV margin for creating PTV:
- geometrical errors
- internal motion of CTV
- treatment technique (beam orientation)
- intra and interfractional errors (patient fixation, daily setup errors)
OAR margin for creating PRV: movements of the OAR due to the
change in size and setup uncertainities