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Independently of the used Inverse Optimization Algorithm it is not an uncommon
result for HDR implants that there exist a few very dominating Dwell positions where
the largest part of the total dwell time is spent.
This leads obviously to a
selective extension of high dose volumes
around such dwell
positions. If there is
no information available
about its necessity (e.g. location of a
GTV/IDL), then it is reasonable to investigate whether this can be avoided.
20 40 60 80 100 120 140 160 180 200
0
5
10
15
20
25
Dwell Time (s)
Dwell Position
?
Inverse Optimisation and Planning
Topography based (TOP) : MR