Advanced Physics for Brachytherapy 2018

Inverse Optimisation and Planning Topography based (TOP)

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.

25

20

15

?

10

Dwell Time (s)

5

0

20 40 60 80 100 120 140 160 180 200

Dwell Position