Table 2.

Summary of individual level registration accuracies using iSV and iCT for intervertebral motion compensation for spine sample #2

Accuracy (mm)	L1	L2	L3	L4	Average (mm)
iSV-based SDE	1.61	1.23	1.20	1.24	1.32 ± 0.19
iSV-based TRE	1.65	1.42	1.29	2.52	1.72 ± 0.55
iCT-based SDE	0.49	0.45	0.43	0.37	0.44 ± 0.05
iCT-based TRE	0.26	0.26	0.20	0.21	0.23 ± 0.03

The iSV reconstruction accuracy before and after inducing the motion was 1.59 and 1.60 mm, respectively, in terms of RMS error between homologous bone-implanted screws identified in iSV and by an independent tracked probe