L0_2016_Athens_Physics_Programme_V6

1154-1155 / 3107

daily kV/MV imaging, on-line correction of marker COM set-up
error (4 implanted gold markers)
σ pre Σ pre σpost Σpost Mpre M post
LR
Mclin
5
Prostate margins – current situation Erasmus MC
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
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