Table 4.

Some results of the first-order statistical features corresponding to the trachea areas

ROIs	Mean	Standard deviation	Skewness	Kurtosis	Energy	Entropy
1	5.80	1.08	0.29	0.41	324.44	2.14
2	4.88	0.84	0.48	1.20	748.76	1.74
3	6.96	0.78	0.11	1.01	1,681.64	1.65
4	7.13	0.85	1.48	9.79	1,387.05	1.66
5	7.20	0.74	0.10	−0.28	1,037.17	1.61
6	3.00	0.34	0.15	8.38	1,690.00	0.61
7	14.45	6.89	0.86	0.36	58.42	4.59
8	7.87	0.99	0.65	1.87	1,590.77	1.99
9	18.59	7.17	0.62	0.12	132.62	4.77
10	37.71	13.59	0.90	1.55	56.96	5.66