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2. inhomogeneities Medium can be of varying density
What changes…?
Our basic equation already accounts for:
• Density @ scatter release voxel 
V
dVjh
1sc,i S
jρ
iρ = 1scD
j
• Density @ energy absorption voxel
The kernel also changes …!
1 )( 1
, 1 ) , 1 exp(
2
1
1
)( 1
1
) ,(
) ,( 1h
dR
sc en r sc
dr R sc
sc dR
dV R sc
r
r sc

 
    
 

 
) (
, 1 ) , 1 exp(
2 )
1(
b B
sc en r sc
dr en
sc
 
 



 

2
exp
r
r
  

 



 , 1
1
) 1(
)( 1
sc en d en
sc dR B



 
 , 1 sc b 