ESTRO course Dose Modelling and Verification 2017

Treatment Planning System Accuracy Out-of-field

• Calculation of dose volume histograms (DVHs) to organs at risk (OARs)

• Dose optimisation

• Calculation of dose to implanted devices or foetus

• Studies have shown Eclipse AAA may underestimate the (local) dose out-of-field >50% • Implication of incorrect modelling of out-of-field dose can also influence dose to the target (Kim et al. 2001 Med. Phys) – contributes >10%