Table 3. Measured Values of Optical Properties and Textural Features for the Different Plaque Types^a.

	Fibrous	Calcified	Lipid	Outliers
µt	2.3 ± 1.3 mm−1	2.0 ± 0.9 mm−1	8.8 ± 1.6 mm−1	~
Mean	356 ± 135	98 ± 42	253 ± 201	16 ± 7
Contrast	122 ± 93	11 ± 10	89 ± 118	0.6 ± 0.7
Cluster shade	923 ± 2000	59 ± 273*	1667 ± 3312	0.5 ± 5*
Energy	0.012 ± 0.001	0.045 ± 0.031	0.026 ± 0.020	0.328 ± 0.172
Entropy	4.45 ± 0.09	3.52 ± 0.56	4.02 ± 0.57	1.40 ± 0.44
Homogeneity	0.21 ± 0.05	0.44 ± 0.10	0.32 ± 0.13	0.77 ± 0.07
Inverse difference moment	0.97 ± 0.02	0.70 ± 0.16	0.85 ± 0.16	0.18 ± 0.11
Information measures of correlation	0.97 ± 0.01	0.99 ± 0.002	0.98 ± 0.02	1 ± 10−4

^aValues are reported as mean ± standard deviation. In order to report statistical significance a one-way ANOVA test (and Bonferroni post-hoc testing when appropriate) was applied. All groups have means significantly different from each other with the exception of the two groups labeled with an asterisk (*).