Physics Bucharest 2017

Prostate margins – current situation Erasmus MC

daily kV/MV imaging, on-line correction of marker COM set-up error (4 impl anted gold markers)

M clin 5 5 5

σ pre

Σ pre

σ post

Σ post

M pre

M post

LR AP 0.7 0.5 1.8 1.7 CC 0.7 0.5 1.9 1.4

1.5 4.7 1.5 4.1

pre:

derived from lateral kV acquired immediately after kV/MV based on-line set-up correction derived from lateral kV acquired immediately after delivery last beam

post:

Differences between pre and post due to intrafraction motion

Mutanga, Heijmen, et al, IJROBP, 2011, 2012