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How big a problem is it?
•
For a bladder tumour at dome
•
Systematic errors ∑
➢
translation 10 mm
➢
Rotation/shape 3mm
•
Random errors
➢
Translation 10mm
➢
Rotation/shape 3mm
•
According to ‘margin recipe’
•
[Van Herk equation 2.5 ∑ + 0.7
]
= 4cm margin
Meijer NKI ESTRO 2010