Advanced Physics for Brachytherapy 2018

Introduction on Dose Optimisation

General Concept: The Mapping process or The Dose Kernel

➔ {D} : D = Ψ . A

{Ψ}

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

ሶ

= ෍ =

. .

−

,

=

or

+∞

= ,

= ෍ =

. .

−

,

= න

´

− ´

−∞

With N

ASDPs the total number of source dwell positions (steps) at positions r i

and dwell times t i .