ESTRO course Dose Modelling and Verification 2017

Direct beam source - open beam fluence distribution

The joint effect of – angular variations of the direct beam source radiance – flattening filter absorption/modulation commonly expressed as an open beam fluence matrix

Can be acquired through a variaty of means: – ”in air” scanning

– diagonal dose profiles in a water phantom – ”star” dose measurements and subsequent deconvolution/fluence fitting

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