Table 1.

Intraoperator Error (Self-Difference in Pixels) on First Testing Data Set

Interface	Error on Averaged Images				Error on Raw Images
	First Operator Error	Second Operator Error	Mean Operator Errora	Automatic Segmentation Errora	First Operator Error	Second Operator Error	Mean Operator Errorb	Automatic Segmentation Errorb
EP	1.89 ± 1.47	1.75 ± 1.37	1.82 ± 1.42	0.08 ± 0.10*	2.15 ± 1.74	1.43 ± 1.19	1.79 ± 1.53	0.12 ± 0.18**
BS	1.99 ± 1.57	2.01 ± 1.55	2.00 ± 1.56	0.10 ± 0.23*	2.22 ± 2.05	1.81 ± 1.54	2.01 ± 1.82	0.38 ± 0.72**
BW	2.10 ± 1.70	1.66 ± 1.40	1.88 ± 1.57	0.05 ± 0.09*	2.40 ± 2.18	1.58 ± 1.32	1.99 ± 1.85	0.13 ± 0.34**
ST	2.89 ± 2.30	2.23 ± 1.84	2.56 ± 2.11	0.23 ± 0.38*	2.96 ± 2.52	2.03 ± 1.90	2.49 ± 2.27	0.19 ± 0.30**
DM	3.02 ± 3.59	2.86 ± 2.97	2.94 ± 3.29	1.39 ± 2.90*	3.20 ± 3.83	3.20 ± 3.75	3.20 ± 3.79	1.10 ± 1.60**
EN	2.80 ± 3.46	2.67 ± 3.15	2.75 ± 3.30	1.35 ± 2.94*	3.25 ± 3.82	2.53 ± 3.37	2.88 ± 3.62	0.87 ± 1.28**
Mean	2.45 ± 2.55	2.20 ± 2.22	2.32 ± 2.39	0.53 ± 1.80*	2.69 ± 2.85	2.10 ± 2.47	2.39 ± 2.68	0.46 ± 0.99**

^a*P < 0.0001.

^b**P < 0.0001 (significance level = 0.05).