Table 2.

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

	mean ± SD	median	range	95% (abs.)
Before correction by ExacTrac
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
After correction by ExacTrac
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

All units are in mm