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Analytical Anisotropic Algorithm (AAA)
superposition of pencil beams, which
are modified/scaled
anisotropically based on tissue
electron densities (3D PB kernel)
– PB separated into depth-directed
(total energy deposited by the
pencil beam) and lateral
components (sum of N radial
exponential function)
Build up and down correction
needed
source model for
– Primary photon source
– extra-focal source for photons
scattered in accelerator head
– electron contamination source
Tillikainen – PMB 2008
▪
Reduced computation
time