IMRT Course 2016

Which assumptions are behind this formula?

σ +Σ = 7.0 5.2

R

Σ

systematic setup errors

random setup errors

σ

• round CTV moves around within idealized round dose distribution with

idealized penumbra, which drops to zero to all sides

• population-based uncertainties , effect quantized as TCP of a population

For the individual patient, the margin will be either too large, or too small…

ESTRO IMRT course 2016 Adaptive Radiotherapy London April 7th, 2016

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