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Image-guidance for whole breast (+/- nodes)
EPID
kV CBCT
• EPID field images (i.e. not orthgonal)
underestimate bony set-up errors by 20% to
50%
• Difference probably insignificant for
tangential whole breast irradiation
• Loco-regional treatment or more advanced
techniques (SIB? IMRT?) could benefit from
a more accurate set up.
Topolnjak IJROBP 2010