Dose Course 2018_Flipping book

Tracing the primary beam to release energy (for later transport by point kernels)

Raytrace integral through CT-matrix

Energy fluence

l

2

r

( )

− 

d l l



0       r r

l

( ) r

( ) 0 r

r



=



e

0

E

E

Incident

Inverse square

modulated and collimated energy fluence

Collision KERMA ( the released energy to become primary dose )



( )

(

)

( ) r

en

P

E

E

=  r

,



d

r

E



E

SCERMA ( the released energy to become scatter dose )

r

  −

( )

(

)

( ) r

en

S

E

E

=  r

,



d

r

E



E

TERMA=collision KERMA+SCERMA

The result for each ray is weigthed by the value of the energy fluence bixel it passes !

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