We present a method for identification of the breast boundary in mammograms that is intended to be used in the preprocessing stage of a system for computer-aided diagnosis (CAD) of breast cancer and also in the reduction of image file size in Picture Archiving and Communication System (PACS) applications. The method starts by modifying the contrast of the original image. A binarization procedure is then applied to the image, and the chaincode algorithm is used to find an approximate breast contour. Finally, identification of the true breast boundary is performed by using the approximate contour as the input to an active contour model algorithm specially tailored for this purpose. After demarcating the breast boundary, all artifacts outside the breast region are eliminated. The method was applied to 84 medio-lateral oblique mammograms from the Mini-MIAS (Mammographic Image Analysis Society, London, UK) database. Evaluation of the breast boundary detected was performed based upon the percentage of false-positive (FP) and false-negative (FN) pixels determined by a quantitative comparison between the contours identified by a radiologist and by the proposed method. The average FP and FN rates are 0.41 and 0.58%, respectively. According to two radiologists who evaluated the results, the segmentation results were considered acceptable for CAD purposes.
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Ferrari, R.J., Rangayyan, R.M., Desautels, J.E.L., Frère, A.F., Borges, R.A. (2007). Detection Of The Breast Contour In Mammograms By Using Active Contour Models. In: Deformable Models. Topics in Biomedical Engineering. International Book Series. Springer, New York, NY. https://doi.org/10.1007/978-0-387-68413-0_5
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DOI: https://doi.org/10.1007/978-0-387-68413-0_5
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