TABLE 9. Results of Comparison of the Four Methods on All Chest CT Images () From CLD Database. The DSC, MHD, Sensitivity, Specificity and Accuracy Were Evaluated. The Mean and Standard Deviation are Summarized.

Method		CV	NMCV	Snake	Proposed method
DSC	mean	0.9878	0.9901	0.9746	0.9911
	std	0.0235	0.0225	0.0341	0.0206
MHD	mean	0.3066	0.2445	0.6709	0.2184
	std	0.2654	0.2643	0.5009	0.2074
Sensitivity	mean	0.9828	0.9870	0.9524	0.9914
	std	0.0371	0.0364	0.0458	0.0314
Specificity	mean	1.0000	0.9992	0.9998	0.9989
	std	0.0000	0.0075	0.0004	0.0016
Accuracy	mean	0.9974	0.9978	0.9950	0.9983
	std	0.0033	0.0033	0.0097	0.0025