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2D vs 3D setup
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?
2D vs 3D setup correction
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
Li et al 2008
CBCT
Planar automatic Planar manual
RL
SI
AP
C/Planar
imaging
underestimates
the setup error
2D vs 3D setup
10 pts, 65 images
Comparing:
– CBCT
– 2D Planar
– (Digital Tomosynthesis)
65pts 10 fractions registration on
CBCT en 2D planar imaging
Wu et al 2007
2D vs 3D setup
33 patients, 100 paired CBCT-planar images
Varian OBI
2009