Table 3 Means and standard deviations per patient of shifts in direction of 3 axes on crawl couch (validation group) by breast cancer laterality (in mm).

1

− 1.4 ± 2.6

6.7 ± 4.9

− 2.1 ± 2.6

21

1.2 ± 2.5

− 2.9 ± 3.2

− 1.6 ± 3.3

2

5.9 ± 2.2

4.1 ± 2.5

2.3 ± 2.3

22

0.5 ± 2.1

− 3.5 ± 3.5

0.4 ± 2.4

3

1.7 ± 2.9

− 3.6 ± 4.5

0.9 ± 3.3

23

0.9 ± 2.9

1.4 ± 5.4

− 3.1 ± 3.4

4

− 0.3 ± 2.3

0.4 ± 2.9

− 1.1 ± 2.3

24

− 0.5 ± 1.7

− 1.8 ± 3.3

− 5.5 ± 3.2

5

4.9 ± 4.5

− 1.9 ± 7.9

4.3 ± 4.8

25

0.8 ± 2.9

− 1.6 ± 2.2

− 5.9 ± 4.7

6

2.4 ± 3.3

− 0.4 ± 2.5

2.4 ± 2.8

26

1.3 ± 2.4

− 3.9 ± 4.6

− 6.4 ± 4.3

7

4.5 ± 3.8

− 3.7 ± 3.2

− 1.4 ± 2.9

27

3.3 ± 2.0

2.8 ± 3.8

− 3.5 ± 3.5

8

4.5 ± 4.2

9.5 ± 6.0

3.3 ± 1.8

28

7.4 ± 2.2

2.4 ± 3.9

− 6.5 ± 4.2

9

− 1.1 ± 1.7

6.3 ± 6.2

5.0 ± 2.8

29

− 4.2 ± 4.4

0.8 ± 3.4

− 6.2 ± 3.4

10

2.4 ± 2.5

6.8 ± 3.4

3.9 ± 2.7

30

9.5 ± 8.7

3.3 ± 10.1

0.1 ± 4.7

11

− 1.1 ± 2.1

− 10.6 ± 2.6

− 0.7 ± 2.1

31

4.3 ± 5.3

− 1.1 ± 4.8

− 0.2 ± 2.9

12

1.9 ± 2.9

− 1.5 ± 3.7

1.3 ± 2.6

32

2.4 ± 2.6

0.0 ± 3.4

3.9 ± 3.8

13

1.4 ± 2.7

3.4 ± 9.2

0.0 ± 4.3

33

3.7 ± 6.6

1.9 ± 4.1

2.1 ± 5.1

14

6.2 ± 3.4

0.5 ± 4.0

0.1 ± 4.4

34

5.1 ± 2.7

− 0.2 ± 5.6

2.4 ± 5.2

15

1.1 ± 3.4

− 0.1 ± 4.8

4.9 ± 4.3

35

− 1.4 ± 5.7

1.1 ± 3.5

− 3.9 ± 4.0

16

− 0.9 ± 3.1

− 2.7 ± 4.4

− 1.0 ± 3.7

36

− 1.1 ± 2.7

0.4 ± 2.4

0.1 ± 3.5

17

− 1.2 ± 3.1

− 0.8 ± 3.1

3.2 ± 4.2

37

1.7 ± 1.9

0.8 ± 3.2

− 5.3 ± 1.9

18

3.8 ± 1.8

− 3.1 ± 3.3

0.2 ± 2.0

38

3.6 ± 5.4

− 2.5 ± 2.6

− 1.0 ± 2.4

19

− 2.2 ± 2.9

0.4 ± 4.0

3.4 ± 3.2

39

0.3 ± 2.5

− 3.4 ± 3.0

− 1.7 ± 2.9

20

1.8 ± 1.1

3.1 ± 3.1

1.9 ± 2.6

40

− 2.6 ± 4.0

0.0 ± 5.4

3.1 ± 3.9

Group systematic error (M)

1.7

0.6

1.5

1.8

− 0.3

− 1.9

Group systematic error SD (Σ)

2.6

4.7

2.2

3.3

2.2

3.4

Root mean square of SD’s (σ)

2.9

4.6

3.2

4.0

4.4

3.7

Required margins (cm)

9

15

8

11

9

11