Dose Course 2018_Flipping book

14

The semi-infinite slab approximation in tissue

The pencil beams are propagated through tissue as if it was made of a stack of slabs, each with the local heterogeneities along each ray extended laterally into homogeneous slabs.

z ò

tot med

S

z

( z ) =

dz

×

eff

tot water

S

0

Dublin 2018