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

Table 3

Interobserver agreements between the results of spinal cord edge detection by our algorithm and by three human experts, compared using Hausdorff distances. Results in mean ± standard deviation and ranges in parentheses.

	Anterior			Posterior
	Observer 1	Observer 2	Observer 3	Observer 1	Observer 2	Observer 3
Automatic segmentation	1.51 ± 0.74	1.51 ± 0.66	1.54 ± 0.68	1.50 ± 0.76	1.44 ± 0.78	1.58 ± 0.79
	(0~3.61)	(0~3)	(0~3.16)	(0~4)	(0~5.83)	(0~5.10)
Observer 1		1.02 ± 0.43	1.01 ± 0.38		1.05 ± 0.55	1.05 ± 0.44
		(0~2.24)	(0~2)		(0~3.61)	(0~3)
Observer 2			0.97 ± 0.39			1.01 ± 0.57
			(0~2)			(0~3)