Radiomics in photon-counting dedicated breast CT: potential of texture analysis for breast density classification

European Radiology Experimental

Table 6 Mean values and coefficients of variance for 19 texture features for the subset of 60 images

Texture feature	Reader 1 (mean)	Reader 2 (mean)	Reader 3 (mean)	Coefficient of variance
Variance	189	186	186	3.23
Skewness	0.653	0.491	0.578	-6.93
Kurtosis	0.412	0.295	0.521	-2.66
Entropy	11.3	11.5	11.6	4.13
Contrast	0.944	0.944	0.942	0.21
Correlation	0.006	0.006	0.006	4.85
Energy	0.443	0.437	0.438	1.11
Homogeneity	5.37	5.41	5.39	0.57
SRE	0.874	0.878	0.877	0.4
LRE	1.82	1.77	1.79	1.91
GLN	1,860	1,550	1,800	10.85
RLN	33,000	28,800	32,200	8.29
RP	0.829	0.835	0.833	0.57
LGRE	0.001	0.001	0.002	5.71
HGRE	1,140	1,150	1,140	0.49
SRLGE	0.001	0.001	0.001	5.6
SRHGE	1,000	1,010	1,000	0.63
LRLGE	0.002	0.003	0.005	6.68
LRHGE	2,300	2,210	2,260	2.76

GLN Grey-level nonuniformity, HGRE High grey-level run emphasis, LGRE Low grey-level run emphasis, LRE Long-run emphasis, LRHGE Long-run high-grey-level emphasis, LRLGE Long-run low-grey-level emphasis, RLN Run-length nonuniformity, RP Run-percentage, SRE Short-run emphasis, SRHGE Short-run high-grey-level emphasis, SRLGE Short-run low-grey-level emphasis