Physics Bucharest 2017

Systematic and random errors

patient 1

cran

- patient’s systematic error

mean error

6

5

1

2 8

- in each fraction: total set-up error =

10

4

7

9

11

systematic error + random error

3

right

left

mean set-up errors

- for each patient: systematic error is a fixed error, occuring every day - random errors are day-to-day variations around the systematic error

caud

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