ESTRO course on Image Guided Radiotherapy in Clinical Practice 2018

Limitation of MV imaging for set-up

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