![Show Menu](styles/mobile-menu.png)
![Page Background](./../common/page-substrates/page0286.jpg)
Geometrical uncertainties
• Systematic
– Same for whole treatment
– Shifts the dose distribution
– May be different for each patient but the same for one patient
– Quantified with standard deviation
Σ
• Random
– Different every day
– Some patients may have larger variations from day to day than
others
– Blurs the dose distribution
– Quantified with standard deviation
σ