Physics Bucharest 2017

Systematic and random errors

patient 1

cran

- patient’s systematic error

mean error

6

5

1

2 8

- systematic error can only be known after completion of fractionated treatment - systematic error cannot be upfront corrected, i.e. prior to start with fractionated treatment

10

4

7

9

11

3

right

left

mean set-up errors

caud

patient set-up errors 2D: each fraction: 