Table 2.

Quantitative CT Image Features

Geometry features	Intensity features	Texture features
Volume	Minimum	Auto correlation
Size_X	Maximum	Contrast
Size_Y	Mean	Correlation
Size_Z	Median	Cluster prominence
Size_P1	Sum	Cluster shade
Size_P2	Variance	Dissimilarity
Size_P3	Standard deviation	Energy
Roundness	Skewness	Entropy
Surface area	Kurtosis	Homogeneity
Compactness_1		Maximum probability
Compactness_2		Variance
Spherical disproportion		Sum average
Surface to volume ratio		Sum variance
		Sum entropy
		Difference variance
		Difference entropy
		Information measure of correlation_1
		Information measure of correlation_2
		Inverse difference
		Inverse difference normalized
		Inverse difference moment normalized