σ
bone
Σ
bone
σ
int
Σ
int
σ
tot
Σ
tot
M
cal
LR 1.6 1.3 0.6 0.5 1.7 1.4
4.0
AP 2.2 1.5 2.8 2.5 3.6 2.9
8.3
CC 1.5 1.4 2.5 2.7 2.9 3.0
8.1
Stroom, Heijmen, et al., R&O, 1999
Prostate margins – historic example Erasmus MC
(formula by Stroom et al: 2Σ instead of 2.5Σ)