IGRT 2016 Madrid

2D vs 3D setup

2D vs 3D setup correction

Varian users use more frequently 2D planar setup correction as opposed to Elekta users Why? – Speed – Ease of use – Tradition? Does it make a difference?

Li et al 2008 – 21 pts, 98 images – 3 methods of registration: CBCT, automated match

(LR and AP) Planar, automated match (LR and AP) Planar, manual match

Same patients, different shifts

2D vs 3D setup

CBCT

Planar automatic Planar manual

10 pts, 65 images Comparing: – CBCT – 2D Planar – (Digital Tomosynthesis)

AP

C/Planar imaging

underestimates the setup error

SI

RL

Li et al 2008

65pts 10 fractions registration on CBCT en 2D planar imaging

2D vs 3D setup

33 patients, 100 paired CBCT-planar images Varian OBI

2009

Wu et al 2007