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Proceedings Paper

Improving the automated classification of clustered calcifications on mammograms through the improved detection of individual calcifications
Author(s): Robert M. Nishikawa; Maria Fernanda Salfity; Yulei Jiang; John Papaioannou
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Paper Abstract

We are developing a semi-automated classification scheme in which the approximate size and location of the cluster (but not the individual calcifications), and a rough estimate of the number of calcifications in the cluster are used to segment individual calcifications. A difference of Gaussians is used to pre-process the ROI centered on the cluster. Next a global and a local grey-level thresholds are applied. The threshold values are determined iteratively based on the approximate number of calcifications in the cluster and the actual number segmented. The center position of each segmented calcification is then determined. These locations are passed to the computer classifier, which determines the likelihood of malignancy for the cluster. Using this approach, 74% of individual calcifications can be detected per cluster compared to 55% when using our cluster detection scheme that does not use the a priori information about cluster. There was no measurable decrease in the classification scheme's performance when using the segmented calcifications from our new approach compared to if all the location of the calcifications were determined manually (area under the ROC curve of 0.85 versus 0.91 respectively, p = 0.2).

Paper Details

Date Published: 9 May 2002
PDF: 7 pages
Proc. SPIE 4684, Medical Imaging 2002: Image Processing, (9 May 2002); doi: 10.1117/12.467097
Show Author Affiliations
Robert M. Nishikawa, Univ. of Chicago (United States)
Maria Fernanda Salfity, Instituto de Fisica Rosario/CONICET-UNR (Argentina)
Yulei Jiang, Univ. of Chicago (United States)
John Papaioannou, Univ. of Chicago (United States)

Published in SPIE Proceedings Vol. 4684:
Medical Imaging 2002: Image Processing
Milan Sonka; J. Michael Fitzpatrick, Editor(s)

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