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daily kV/MV imaging, on-line correction of marker COM set-up
error (4 impl
anted gold markers)
σ
pre
Σ
pre
σ
post
Σ
post
M
pre
M
post
LR
AP 0.7 0.5 1.8 1.7
1.5 4.7
CC 0.7 0.5 1.9 1.4
1.5 4.1
M
clin
5
5
5
pre:
derived from lateral kV acquired immediately
after kV/MV based on-line set-up correction
post:
derived from lateral kV acquired immediately
after delivery last beam
Differences between pre and post due to intrafraction motion
Mutanga, Heijmen, et al, IJROBP, 2011, 2012
Prostate margins – current situation Erasmus MC