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Pencil kernel characterization
II. Iterative optimisation of kernel shape
Modified kernels
from iterative optimisation using central
kernel value in the search for the best
match between calculated dose (using
then actual fluence pattern) and
measured dose
Optimal 6MV kernel
profile
at 5cm depth
Bergman et al (2004)
Med Phys 31
, 3279-87
initial (‘ion chamber’) kernel at
5cm depth
(2.5mm resolution)
6MV (Varian 21EX), Pencil kernels optimisation on Eclipse TPS (PBC model)