Target Volume Determination 2015

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 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