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AAA
        sdd dkdk dD
A
r d
2 , , ,  




   
  s s r s r 
D(r, d)
|r- s|΄ also uses EPL
2D fluence ( s)
s
( s)
k(d, |r-s|)
d΄ now
individually
calculated for
each pencil
beam, according
to equivalent path
length
Slide from Dr. James Bedford ESTRO physics course,
June 2017