Table 8.

Uncertainty in selecting corresponding points on iMR image volume given a set of preoperative feature points: average uncertainty in localizing corresponding intraoperative feature point ± standard deviation of the uncertainty measured in distance from the centroid.

Patient #	Surface (mm) (# of points)	Subsurface (mm) (# of points)	All (mm) (# of points)	Friedman test $p$-value
1	$1.1\pm 0.5$ (12)	$0.9\pm 0.4$ (21)	$1.0\pm 0.5$ (33)	0.18
3	$1.0\pm 0.5$ (11)	$0.8\pm 0.6$ (27)	$0.8\pm 0.6$ (38)	0.12
4	$0.7\pm 0.5$ (10)	$0.7\pm 0.3$ (16)	$0.7\pm 0.4$ (26)	0.11
Average	$0.9\pm 0.5$ (33)	$0.8\pm 0.5$ (64)	$0.8\pm 0.5$ (97)	N/A