A Hierarchical Classification Method for Breast Tumor Detection

Document Type: Original Paper

Authors

1 Electrical & Computer Dept., University of Gonabad, Gonabad, Iran

2 Medical Physics Dept., Gonabad University of Medical Sciences, Gonabad, Iran

3 Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran

4 Basic Sciences Dept., Gonabad University of Medical Sciences, Gonabad, Iran

Abstract

Introduction
Breast cancer is the second cause of mortality among women. Early detection of it can enhance the chance of survival. Screening systems such as mammography cannot perfectly differentiate between patients and healthy individuals. Computer-aided diagnosis can help physicians make a more accurate diagnosis.
Materials and Methods
Regarding the importance of separating normal and abnormal cases in screening systems, a hierarchical classification system is defined in this paper. The proposed system is including two Adaptive Boosting (AdaBoost) classifiers, the first classifier separates the candidate images into two groups of normal and abnormal. The second classifier is applied on the abnormal group of the previous stage and divides them into benign and malignant categories. The proposed algorithm is evaluated by applying it on publicly available  Mammographic Image Analysis Society (MIAS) dataset. 288 images of the database are used, including 208  normal and 80 abnormal images. 47 images of the abnormal images showed benign lesion and 33 of them had malignant lesion. 
Results
Applying the proposed algorithm on MIAS database indicates its advantage compared to previous methods. A major improvement occurred in the first classification stage. Specificity, sensitivity, and accuracy of the first classifier are obtained as 100%, 95.83%, and 97.91%, respectively. These values are calculated as 75% in the second stage  
Conclusion
A hierarchical classification method for breast cancer detection is developed in this paper. Regarding the importance of separating normal and abnormal cases in screening systems, the first classifier is devoted to separate normal and tumorous cases. Experimental results on available database shown that the performance of this step is adequately high (100% specificity). The second layer is designed to detect tumor type.  The accuracy in the second layer is obtained 75%.  

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Volume 13, Issue 4
November and December 2016
Pages 261-268
  • Receive Date: 15 August 2016
  • Revise Date: 11 September 2016
  • Accept Date: 03 November 2016