SBRT 2016

Take home message

• A set-up accuracy of approximately 2 mm/1 ° for brain and 1 mm/1 ° for spine irradiations (1 SD) has been associated with clinically relevant parameters.

• All current immobilisation systems for brain or spine SBRT can be used, if properly combined with on-line IGRT.

• Immobilisation systems associated with larger rotational errors are not preferred or should be combined with a 6DOF couch correction or in combination with multiple isocenters. • One should perform complete end-to-end tests to establish the complete treatment chain accuracy and implement the appropriate CTV-PTV margins accordingly.