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Treatment - All is well?
Portal imaging data from a long time ago…
• Systematic errors: 1 to 2 mm (SD)
• Random errors: 1 to 2 mm (SD)
Hurkmans
et al
# Patients
# Images
Direction
σ
sys
(mm)
σ
random
(mm)
Reference
31
ml
cc
ap
1.8
1.7
2.0
1.5
1.1
1.6
(Bel et al., 1995)
26
356
ml
cc
ap
rot ant
rot lat
1.8
2.7
1.7
1.2
°
0.7
°
1.6
1.5
1.2
0.8
°
1.0
°
(Vos et al., 1997)
12
192
cc
ap
2.0
1.3
1.4
1.7
(Yan
et al., 1997b)
12
290
ml
cc
ap
1.8
a
2.2
a
1.7
a
1.4
1.4
1.4
(Gildersleve et al., 1995)