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Take home message
•
One should perform
complete end-to-end tests, including patient
delineation and setup data
to establish the complete treatment chain
accuracy and implement the appropriate CTV-PTV margins accordingly.
•
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.