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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