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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%