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= ,
=
=
,
. .
−
Ψ
is for a single stepping source delivery system (afterloader) the
Source
Propagation Function
A
is the energy absorption per unit mass (dose) and unit energy fluence
or the
Dose Kernel
With
N
ASDPs
the total number of source dwell positions (steps) at
which
positions
r
i
and with
what
dwell times
t
i
?
General Concept: The
Inverse Problem
{D}
➔
{Ψ} : D = Ψ . A
or
=
ሶ
=
=
,
. .
−
= න
−∞
+∞
´
− ´
Inverse Optimisation and Planning