Advanced Skills in Modern Radiotherapy 2018

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