IMRT 2017

Small fields require a careful beam modelling in the treatment planning system (TPS) in order to shape accurately the behaviour of the radiation beam in such circumstances. Wider values for the source dimensions will cause an overestimation of beam penumbra , while output factors calculated would be underestimated compared to those measured. IMRT CONCERNS ON SMALL FIELD DOSIMETRY AND BEAM MODELLING

( Aspradakis et al ., Med Dosim. 2005 )