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Dose modelling dose in small & composite fields

Other aspects of modelling treat ent planning systems (TPS)

affecting dose calculations in small photon fields

30

Aspects of beam modelling on treatment planning systems (TPS) that play major

role on the calculation of dose in plans comprising of small MV photon beams:

finite size of beam source (also referred to as

focal spot

)

jaw and MLC leaf edges

resolution: choice of pixel/voxel sizes in fluence and dose matrixes

Inhomogeneities