646 / 1816
Image-guidance for whole breast (+/- nodes)
EPID kV CBCT
• EPID field images (i.e. not
orthogonal) 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