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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?