1170-1171 / 3107
L = real tumor length
L' = depicted tumor length
R = top-top motion amplitude
Required margin around L' = R
Breathing motion artefacts in planning CT-scan
Wunderink, Heijmen et al. IJROBP 68-1: 282–290, 2007
L'+2R is visible tumor with margin
L+R < L'+2R < L+3R