942 / 1456
IGRT for
(Supine)
APBI:
What are people doing?
Aim: to assess
the residual
and
intrafraction
errors
PTV = CTV+10mm
5 fld non coplanar
95%/95%
Pre and post fx XVI
Grey value match
Manual adjustment
2-3 mins
Matched by RO
CBCT does not guarantee absolute accuracy
13mm margin required to account for initial
setup and intrafraction errors