Table 2.

Summary statistics for phantom texture in the synthetic 2D mammogram assuming lattice parameters w = d = 6.3 mm.

SYNTHETIC 2D MAMMOGRAM
Groups of Features	Individual Features	Mean (Std Dev) of 16 Auto-Timed Images	Coefficient of Variation	Percentile Rank of Mean Relative to Clinical Distribution
Group 1: Grey-level histogram	Max	2.98 (0.0241)	0.00811	92.1%
	Min	−1.26 (0.0238)	0.0188	65.8%
	Mean	0.0371 (0.00588)	0.158 *	55.4%
	Sum	1.29 × 102 (20.5)	0.158 *	51.4%
	Entropy	5.96 (0.0266)	0.00446	1.40% **
	Kurtosis	5.98 (0.175)	0.0292	99.0% **
	Sigma	0.730 (0.00917)	0.0126	98.7% **
	Skewness	1.35 (0.0438)	0.0324	99.7% **
	5th Percentile	−0.764 (0.0141)	0.0184	71.6%
	5th Mean	−0.883 (0.0168)	0.0191	72.4%
	95th Percentile	1.59 (0.0201)	0.0127	>99.9% **
	95th Mean	2.02 (0.0190)	0.00941	99.8% **
Group 2: Co-occurrence	Cluster shade	1.99 × 104 (4.69 × 102)	0.0236	>99.9% **
	Energy	1.28 × 10−3 (9.95 × 10−5)	0.0778 *	99.6% **
	Entropy	8.78 (0.0337)	0.00384	<0.1% **
	Inertia	4.92 × 102 (6.35)	0.0129	>99.9% **
	Correlation	9.28 × 10−4 (2.46 × 10−5)	0.0265	30.1%
	Haralick correlation	9.49 × 106 (5.00 × 105)	0.0528 *	1.50% **
	Inverse difference moment	0.107 (0.00324)	0.0302	99.9% **
Group 3: Run length	Grey-level non-uniformity	72.0 (1.65)	0.0229	89.8%
	Run-length non-uniformity	3.25 × 103 (10.4)	0.00320	<0.1% **
	Run percentage	0.934 (0.00295)	0.00316	0.5% **
	High grey-level run emphasis	2.26 × 103 (40.7)	0.0180	11.5%
	Long run emphasis	1.00 (6.79 × 10−5)	6.79 × 10−5	94.5%
	Low grey-level run emphasis	2.94 × 10−3 (1.26 × 10−4)	0.0429	99.4% **
	Short run emphasis	1.00 (1.70 × 10−5)	1.70 × 10−5	3.40%

^*Coefficient of variation exceeds 0.05.

^**Phantom texture is unrealistic relative to clinical data.