Components

Systematic error S (mm)

Random error σ (mm)

van Herk margin (mm)

LR

SI

AP

LR

SI

AP

LR

SI

AP

Isocenter coincidence^a

0.51

0.12

0.62

1.6

1.0

1.6

Isocentric rotation

0.10

0.89

0.18

0.3

2.2

0.4

Residual error imaging system

0.39

0.50

0.49

0.29

0.29

0.29

1.2

1.5

1.4

Set-up residual error

0.31

0.81

0.44

0.74

1.03

1.11

1.3

2.7

1.9

Prostate rotation

0.22

0.49

0.49

0.20

0.39

0.41

0.7

1.5

1.5

Prostate deformation

0.19

0.23

0.24

0.16

0.56

0.26

0.6

1.0

0.8

Intrafraction motion

0.39

0.79

0.65

0.77

1.34

1.22

1.5

2.9

2.5

Contouring

1.0

1.4

0.9

2.5

3.5

2.3

Quadratic sum

Quadratic sum

Total margin

1.32

2.14

1.54

1.13

1.85

1.75

4.4

7.3

5.1