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Pencil Beam Approximation
Irradiation field decomposed in
thin pencil
beams
Superposition
of
longitudinal
pencil beam
kernels
in 2D (much faster
since 2D integration)
Summation
of individual narrow beams
Kernel creation by deconvolution of measurements (or MC)
Pencil beam kernel cannot be modified locally (i.e. for inhomogeneities),
does
not
take the changes of
lateral scattering
effects into consideration