Fig. 8.
Geometric pairing of the clusters detected on the CC and MLO views. For a cluster CC1 on the CC view, the nipple-to-object distance Rc is computed. On the MLO view, any object that falls within the annular region delineated by the two concentric arcs Rc + ΔR and Rc − ΔR centered on the nipple location is paired with the cluster candidate CC1 on the CC view. In this example, two pairs are defined: CC1-CM1 pair and CC1-CM2 pair. Although a third cluster candidate exists on the MLO view, it is not paired with CC1 because it falls outside the defined annular region. The half-width ΔR of the annular region is determined using the training data set.