Dia 1

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Individual margins
Based on van Herk’s margin formula
• Respiration amplitude / breath hold reproducibility
• Uncertainties evaluated base on your own data
 Tumour baseline shift
 3D instead of 6D match
 Delineation uncertainty
 Differential motion
• No. of fractions
• Penumbra width
 Lung/bone/softtissue
p p margin PTV            2 2