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Texture feature P Angular second moment 0.100 Contrast 0.043 Correlation 0.992 Sum of squares: variance 0.035 Inverse difference moment 0.168 Sum average 0.963 Sum variance 0.042 Sum entropy 0.396 Entropy 0.229 Difference variance 0.233 Difference entropy 0.039 Information on measurement of correlation 1 0.239 Information on measurement of correlation 2 0.247 P values refer to probability of statistically significant difference in each texture feature, when comparing pre- and post-PCI image sets.
Texture feature R frontal R parietal R temporal L frontal L parietal L temporal Angular second moment 0.292 0.212 0.173 0.449 0.176 0.335 Contrast 0.720 0.757 0.472 0.833 0.637 0.763 Correlation 0.821 0.232 0.557 0.984 0.609 0.989 Sum of squares: variance 0.651 0.630 0.483 0.850 0.384 0.740 Inverse difference moment 0.214 0.400 0.430 0.922 0.332 0.328 Sum average 0.133 0.010 0.892 0.221 0.047 0.501 Sum variance 0.618 0.416 0.557 0.884 0.351 0.760 Sum entropy 0.478 0.205 0.576 0.846 0.744 0.296 Entropy 0.322 0.272 0.197 0.451 0.145 0.254 Difference variance 0.286 0.238 0.842 0.852 0.550 0.351 Difference entropy 0.452 0.437 0.790 0.953 0.785 0.574 Information on measurement of correlation 1 0.465 0.448 0.790 0.478 0.138 0.409 Information on measurement of correlation 2 0.921 0.980 0.061 0.497 0.034 0.109 Values refer to probability of statistically significant difference in each texture feature (P value), when comparing pre- and post-PCI image sets.
Feature name Formula Contrast Sum of squares: variance Sum variance Difference entropy θ) corresponds to entry in GLCM, designating probability of pixel with gray-level of i being distance d pixels away from neighboring pixel with gray-level of j in θ direction. In this study, we fixed d at 1 pixel and averaged over available directions for θ. Ng represents number of gray levels. x and y are row and column indices of GLCM, and
is probability of 2 indices summing to
, whereas
is probability that difference 2 indices is
; μ is mean of p.