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IGRT with CBCT for prone APBI
Jozsef et al. IJROBP 81:568-574. 2011
343 CBCT verifications at 70 patients in prone position
manual matching between planning and CBCTs using
breast/chest wall
interface
planning CT
CBCT
AP SI
ML
systematic 0.38 0.21 0.28
random 0.43 0.29 0.37
margin
1.26 0.73 0.96
the interfraction variations detected are
comparable
to those reported for APBI with a supine setup
the currently applied margin to the CTV of
1.5 cm
adequately compensates for the detected setup
variability
Derived quantities from shifts in cm