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Sample systematic error. These plots of (a) a superior–inferior profile taken from a sagittal film and (b) an anterior–posterior profile taken from an axial film are from an institution trial deemed to exhibit systematic errors in treatment planning and delivery, as there is a systematic difference of ∼8% between the measured and calculated dose distributions in the high-dose region. Such errors constitute the majority of errors observed in failing plans. PTV = planning target volume.
