Dose Course 2018_Flipping book

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

• Some studies have shown underestimation of the 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%