Advanced Physics for Brachytherapy 2018

3. Higher order of scatter

Instead of using h

with S

obtained from

1sc

1sc

D

, to obtain D

prim 1sc couldn’t I distribute S 1sc due to ALL orders of scattering in a single step using a different kernel, i.e. h msc …? I could, but it is NOT a good idea due to: • h msc reducing less than h 1sc with r → ray artefacts • accuracy close to boundaries of finite geometries (discussed in the following)

Figures from: Carlsson & Ahnesjö Phys. Med. Biol. 45 357 (2000)