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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.