Table 2 Improvement after correction and re-verification by ExacTrac (N = 70)

 lateral

–0.7 ± 2.3

–0.7

–7.7 to +5.9

<5.2

 longitudinal

+0.3 ± 1.5

+0.2

–3.6 to +4.6

<3.5

 vertical

–1.2 ± 1.8

–0.8

–10.7 to +1.3

<3.1

 radial

2.9 ± 2.0

2.3

0.2 to 11.8

<6.1

 lateral

+0.03 ± 0.25

+0.02

–0.40 to +1.13

<0.38

 longitudinal

–0.02 ± 0.21

–0.04

–0.54 to +0.95

<0.40

 vertical

+0.01 ± 0.22

+0.01

–0.67 to +0.56

<0.51

 radial

0.32 ± 0.22

0.26

0.07 to 1.33

<0.69