Dose Course 2018_Flipping book
Convention problem: dose
dose
dose
!!
medium
cell nucleus in medium
water
approx. eqs:
Reference dosimetry: dose to a small water element w embedded at depth z in a large water phantom:
m
en,w
z
w m −
D
=
e
w,w
0
m
“Monte Carlo dose” can be implemented as dose to medium in medium:
en,m
z
m m −
D
=
e
m,m
0
m
en,m
z
m m −
w
D
s
=
e
Often considered as a surrogate for nucleus dose
w,m
0
m
w
D
D s
=
Bragg Gray cavity conversion (simple in Monte Carlo)!!
w,m
m,m m
z
m m −
m m
e e
en,m w
Hence, full conversion from small water element in water to small water element in medium:
w,m D s =
D
m
w,w
z
w m −
en,w
The way different TPS does it
This talk....
Dublin 2018
4
From Anders Ahnesjö
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