Abstract
In this paper, methods are presented for automatic detection of the nipple and the pectoral muscle edge in mammograms via image processing in the Radon domain. Radon-domain information was used for the detection of straight-line candidates with high gradient. The longest straight-line candidate was used to identify the pectoral muscle edge. The nipple was detected as the convergence point of breast tissue components, indicated by the largest response in the Radon domain. Percentages of false-positive (FP) and false-negative (FN) areas were determined by comparing the areas of the pectoral muscle regions delimited manually by a radiologist and by the proposed method applied to 540 mediolateral-oblique (MLO) mammographic images. The average FP and FN were 8.99% and 9.13%, respectively. In the detection of the nipple, an average error of 7.4 mm was obtained with reference to the nipple as identified by a radiologist on 1,080 mammographic images (540 MLO and 540 craniocaudal views).
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Acknowledgment
We thank the radiologists and faculty members of the Medical Center of the Faculty of Medicine, University of São Paulo, Ribeirão Preto, Brazil, for providing the mammograms used in this work. We thank the State of São Paulo Research Foundation (FAPESP); the National Council for Scientific and Technological Development (CNPq); the Foundation to Aid Teaching, Research, and Patient Care of the Clinical Hospital of Ribeirão Preto (FAEPA/HCRP); and the Catalyst Program of Research Services of the University of Calgary for financial support.
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Hausdorff Distance
Hausdorff distance1 is the maximum distance of the points in a set to the corresponding nearest points in another set. Formally, the Hausdorff distance from set A to set B is a maximin function, defined as
where, a and b are points of sets A and B, respectively, and d(a,b) is any metric between these points; for simplicity, we take d(a,b) as the Euclidian distance between a and b.
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Kinoshita, S.K., Azevedo-Marques, P.M., Pereira, R.R. et al. Radon-Domain Detection of the Nipple and the Pectoral Muscle in Mammograms. J Digit Imaging 21, 37–49 (2008). https://doi.org/10.1007/s10278-007-9035-6
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DOI: https://doi.org/10.1007/s10278-007-9035-6