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A Ahnesjö and P Andreo (1989)

Phys Med Biol 34

, 1451-64.

A Ahnesjö et al (1992)

Med Phys

19, 263-273

pencil kernel determination:

Beam modelling refresher: spectrum determination to make a polyenergetic

kernel from a library of Monte Carlo generated monoenergetic kernel:

electron cont

1 2

1 2

fsize depth, fsize

ebin 1 2

depth, fsize, ebin

depth

1 2

fsize depth

ebin

, ..., , ...

c

, ...

, ...

s s e e

D

s s d

d

e e



Measured depth dose,

phantom scatter normalized

Spectrum model, constrained

to a “physical” shape

MC calc depth doses for

monoenergetic photons

Electron contamination

model

Error norm to minimize by

varying parameters