CPB Ljubljana 2018 course book

Forward Planning / Optimization Geometrical “ Optimisation ”, GO

▪ The dwell time of the source at a dwell position is inversely proportional to the dose contribution of neighboring source dwell positions. ▪ Points a, b, c, … are source dwell positions (SDPs).

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1

1

1

Implant / Catheters

2 r T D 1 

T

T











...

1

b

2

3

2

2

r

r

b

b

b

1

2

3

1 2

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large 

1

If D

b

b

T

:



2

b

T

small

D

b

b

T i equal to 1 at start, iteratively calculated until nothing changes anymore.

3