ESTRO course Dose Modelling and Verification 2017

Beam energy spectra Unfolding measured transmission data

Variable thickness attenuator

Detector



E

x

Narrow beam

Treatment head

Secondary collimator

 S x



E

max

    m

E x

 

R E

E



e

d



  R E

Detector response

E

    0

General:

S x S

0



E

max

Energy fluence spectrum

  R E E  d E





E

0

  i   m

E x

  j





S x

E

S  

A





e





j

Simple approach: (neglects energy response variations)

E

i

j

, i i j

i

i

i

to be solved by numerical methods (linear algebra)

27