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calculation techniques:

Calculation task – make dose out from given beam(s), a pencil kernel and the

patient geometry

 

Field

, ,

,

,

, d d

p

D x y z

x y

x

x y y z x y

 



Energy

fluence

Theory: view the incident photon fluence as

composed (i.e. a sum) of pencil beams, so

summing pencil kernels in the same way

should give give the dose

Reality:

• Do it fast!

• Do it faster!!

• Faster!!!!!

• Consider inverse square law

• Heterogeneties???

• Special cases of interest?