Dose 2016

Pencil kernel characterization

II. Optimisation of kernel shape - with the aid of a test pattern fluence

Ideal fluence pattern

Ideal fluence profile

Sensitive to radial pencil kernel properties, but imperfections in the fluence modelling will yield errors in the resulting pencil kernel.

Actual fluence profile

Actual fluence pattern

Bergman et al (2004) Med Phys 31 , 3279-87