Atlas-Free Cervical Spinal Cord Segmentation on Midsagittal T2-Weighted Magnetic Resonance Images

Table 2

Interobserver agreements between the results of spinal cord segmentation by our algorithm and by three human experts, compared using Jaccard indices. Results in mean ± standard deviation and ranges in parentheses.

	Observer 1	Observer 2	Observer 3
Automatic segmentation	0.980 ± 0.015	0.979 ± 0.015	0.977 ± 0.015
	(0.922~1.000)	(0.937~1.000)	(0.939~1.000)
Observer 1		0.987 ± 0.010	0.987 ± 0.010
		(0.955~1.000)	(0.957~1.000)
Observer 2			0.989 ± 0.010
			(0.951~1.000)