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ESTRO IMRT course 2015
IMRT optimization: algorithms&cost functions
Brussels October 5th, 2015
-27-
Parametrisation of the Solution Space by
Weight Factors
normal tissue goal
G
(
)
G F L
λ
λ
−+ =
1
7/8
5/8
6/8
4/8
3/8
2/8
1/8
Problems with manual
weight adjustments:
goals and weight factors are
not inversely proportional
changing one
weight factor
affects all
other goals
Weight factors make the
solution space accessible, but are
not well suited for exploring it
during the search for the best
balance between goals.
target goal
F