Automatic detection of clustered microcalcifications in digital mammograms using mathematical morphology and neural networks

Authors:
Stelios Halkiotis;Taxiarchis Botsis;Maria Rangoussi
Affiliations:
Health Informatics Laboratory, Faculty of Nursing, University of Athens, Greece;Health Informatics Laboratory, Faculty of Nursing, University of Athens, Greece;Department of Electronics, Technological Educational Institute of Piraeus, Greece
Venue:
Signal Processing
Year:
2007

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Abstract

In this paper we propose a new algorithm for the detection of clustered microcalcifications using mathematical morphology and artificial neural networks. Mathematical morphology provides tools for the extraction of microcalcifications even if the microcalcifications are located on a non-uniform background. Considering each mammogram as a topographic representation, each microcalcification appears as an elevation constituting a regional maximum. Morphological filters are applied, in order to remove: (a) noise and (b) regional maxima that do not correspond to calcifications. Each candidate object is marked as such, using a binary image. The original mammogram is used for the final feature extraction step. For the classification step we employ neural network classifiers. We review the performance of two multi-layer perceptrons (MLP) and two radial basis function neural networks (RBFNN) with different number of hidden nodes. The MLP with ten hidden nodes achieved the best classification score with a true positive detection rate of 94.7% and 0.27 false positives per image.