training set. The dataset is extended to include 200 normal images from four different breast types, 50 normal images drawn from each. The use of normal mammograms will demonstrate the specificity levels of the adaptive knowledge-based model. Table 11.17 shows the frequency of predicted breast groupings for normal and abnormal classes following breast type classification. The adaptive knowledge-based model is evaluated in its ability to provide an optimal segmentation for all the normal and abnormal mammograms.