Dose Course 2018_Flipping book

patient: How does the algorithm work?

Scatter Kernel (accounts for field size dependence)

d

reconst

primary

 

 

ref

mid ij



(

)

=

Pr

(

)





d Sc

d

T SPR

K

 

ij

reconst

reconst

ij

ij

Scatter to primary ratio: Depends on the depth

D

i,j

Need to know the Primary Dose to the EPID EPID calibration + modelling

8-11 h measurements 2h modelling

D EPID

i,j

(d

) = Pr

(d

)+ Sc

(d

)

D i,j

reconst

ij

reconst

ij

reconst

Per linac, per beam

Primary Dose Scatter Dose