TABLE 2. Results of Comparison of the Four Methods on All Chest CT Images (). The DSC, MHD, Sensitivity, Specificity and Accuracy Were Evaluated. The Mean and Standard Deviation are Summarized.

Method		CV	NMCV	Snake	Proposed method
DSC	mean	0.9692	0.9693	0.9684	0.9709
	std	0.0524	0.0513	0.0514	0.0511
MHD	mean	0.5191	0.5162	0.5227	0.5006
	std	0.5978	0.5837	0.5927	0.5771
Sensitivity	mean	0.9550	0.9554	0.9543	0.9585
	std	0.0728	0.0722	0.0746	0.0722
Specificity	mean	0.9992	0.9991	0.9993	0.9981
	std	0.0015	0.0013	0.0017	0.0012
Accuracy	mean	0.9952	0.9953	0.9951	0.9954
	std	0.0129	0.0128	0.0132	0.0129