A New Computer-Aided Diagnosis System with Modified Genetic Feature Selection for BI-RADS Classification of Breast Masses in Mammograms

Table 1

Summary of all quantified BI-RADS features used in this study.

BI-RADS category	Descriptors	Feature number	Feature name
Shape	Round; Oval; Lobular; Irregular	1-9 (9 features)	Continuity; Curvature; Irregularity; Difference area: convex hull area, minus mass area; Mean variation; Variance variation; Skewness variation; Kurtosis variation; Entropy variation
Margin	Circumscribed; Microlobulated; Obscured; Indistinct (ill-defined); Speculated	12-32 (21 features)	Kurtosis; Entropy; Index of the maximum probability
Density	High; Equal; Low; Fat-containing radiolucent	33-130 (98 features)	Angular second moment; Contrast; Correlation; Variance (sum of squares); Inverse difference moment; Sum average; Sum variance; Sum entropy; Entropy; Difference variance; Difference entropy; Information measure of correlation 1; Information measure of correlation 2; Maximal correlation coefficient
Additional features	—	10-11 (2 features)	Mass size; Patient age