Effect of Feedforward Back Propagation Neural Network for Breast Tumor Classification
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1 IJCST Vo l. 4, Is s u e 2, Ap r i l - Ju n e 2013 ISSN : (Online) ISSN : (Print) Effect of Feedforward Back Propagation Neural Network for Breast Tumor Classification 1 Rajeshwar Dass, 2 Sanjeet 1,2 Dept. of ECE, Deenbandhu Chhotu Ram Univ. of Science & Tech., Murthal, Harayana, India Abstract Now these days, breast cancer is the most common disease found in women. Mammography is preferred for the early detection of presence of tumor inside the breast. This paper presents an approach based on feedforward back propagation neural network () for breast tumor classification. Statistical texture features are extracted from mammograms and suitable features are selected and used to train the. The fully trained network with different number of neurons in hidden layer is tested with unknown inputs and performance of the method is evaluated in the form of accuracy, specificity, sensitivity, and precision for the classification of breast tumor. Keywords Breast Tumor, Mammograms, Sensitivity, Specificity, Precision and Accuracy I. Introduction Breast cancer has been evolved as the most common disease among women in the world and it has been increasing over the years. Breast tumor basically resulted from abnormal growth of tissues resulted into formation of a mass. Most of the breast tumor are benign (non-cancerous) but few of them becomes malignant (cancerous) and causes the death among women. Thus early detection of these tumors results into lesser number of deaths among women. According to a report, in US during the year 2012, it has been estimated that 226,870 new cases of invasive breast cancer are expected among women and also 63,300 new cases of insitu breast cancer are also anticipated during the year 2012 [1]. For early detection of breast tumor mammography is the most obvious and preferred choice. The literature concludes that using mammography for early detection of breast disease saves life and increases treatment options [1]. The sign of abnormalities in mammograms that radiologists look for are the presence of masses and clusters of microcalcifications [2]. The radiologist misinterpretations of mammograms leads to the increased number of false positive cases and thus leads to the development of computer aided detection system which reduces false positive cases by assisting radiologists in making correct interpretations on mammograms. The numerous researchers worked on development of mammogram classification system. Jong kook kim et al. [3] in year 1999 proposed a classification system for microcalcifications detection in digitized mammograms using back propagation neural network as a classifier and was based on texture features. Lubomir Hadjiisji et al. [4] in year 1999 suggested a hybrid classifier which combines adaptive resonance theory (ART2) network with linear discriminant analysis (LDA) network for classification of malignant and benign masses. Arnau Oliver et al. [5] in year 2006 suggested a new approach for classification of masses based on Eigen faces approach. The classifier used was the combination of decision tree with K-Nearest neighbour algorithm and for performance analysis, ROC was used. Mohammed J Islam et al. [6] in year 2010 used ANN and statistical texture features for characterization of masses in mammogram. M Vasantha et al. [7] employed decision tree as a classifier available in free machine learning package Waikato Environment for Knowledge Analysis (WEKA) and used histogram intensity and gray level co-occurrence matrix (GLCM) features and a hybrid feature selection approach for mammogram classification. The rest of the paper is structured as follows. Section II presents performance evaluation parameters for the classifier. Section III provides the methodology used for the mammogram classification problem. Section IV focuses on experimental results obtained during testing of the system and in section V conclusion and future prospective are discussed. II. Performance Evaluation Parameters The performance of the classifier is analyzed with the help regression plots. The regression plot is a graph obtained between the desired output or target value and the actual output obtained by the classifier. It has a parameter known as regression coefficient denoted by R. The higher the value of R, the better is the classifier. The range of R is from 0 to 1. The performance of the classifier can also be derived by using confusion matrix having number of correctly and incorrectly recognized examples for each class, named as confusion matrix. The confusion matrix for the case of binary classification [8] is shown below in Table 1. Table 1: Confusion Matrix Observed class Actual class Positive Negative Positive tp fn Negative fp tn tp: It represents true positive and it is an estimation of correctly recognized positive examples. fn: It represents false negative and it is an estimation of incorrectly recognized positive examples. fp: It represents false positive and it signify the incorrectly recognized negative examples. tn: It represents true negative and it signify correctly recognized negative examples. From the confusion matrix, following performance evaluation parameters could be derived which are as follows. A. Sensitivity It is also known true positive rate (TPR) and it estimates the percentage of positive examples correctly predicted by the classifier and is given by the equation (1) [8]. (1) B. Specificity It the measure of percentage of correctly predicted negative examples and is given below by equation (2) [8]. (2) C. Precision It measures the probability of exactness of a positive predication and is given below in equation (3) [8]. (3) International Journal of Computer Science And Technology 731
2 IJCST Vo l. 4, Is s u e 2, Ap r i l - Ju n e 2013 ISSN : (Online) ISSN : (Print) D. Accuracy It shows overall percentage of correct predication and is largely used performance parameter. It is specified by formula given below in equation (4) [8]. (4) III. Methodology Used The proposed method for classification of mammogram into abnormal mammograms containing tumor to that of normal mammogram is shown below in the fig. 1. A. Mammogram Image Database In this study, the mammogram images are taken from the database of Mammographic Image Analysis Society (MIAS). MIAS is an UK research group related to breast cancer analysis. Films were obtained from UK National Breast Screening Programme (NBSP) and made available online at the Pilot European Image Processing Archive (PEIPA) at the University of Essex [9]. All images are digitized with resolution of pixels and 8 bit of gray values. From this database 88 mammograms are taken. Out of 88 mammograms, 50 mammograms are used for training and remaining 38 are used for testing of the classifier. Mammogram Image database Preprocessing of Mammogram ROI Selection and Extraction Feature Extraction and Selection Classification Evaluation and cropping of the ROI is done by leaving other parts of the image intact and these ROI is used for feature extraction step. D. Feature Extraction and Selection Texture feature are used which are extracted by using GLCM method. It is statistical approach which estimates second order statistical moments and considers spatial relationship among pixels or group of pixels [12]. Spatial relationship is designated as the pixel of interest and pixel to its immediate rights. For example, in GLCM each element (i, j) is the sum of number of the pixel i occurred in the specified spatial relationship to the pixel j in the original image. Haralick proposed a GLCM that is based on joint probability distribution of a pair of pixels and this method is most widely used for texture analysis [13]. From Haralick GLCM 13 features are extracted which are: energy, contrast, correlation, sum of variance, inverse difference moments, entropy, sum average, sum variance, sum entropy, difference entropy, difference variance, information measure of correlation 1&2 [13]. Feature selection is used because it helps to reduce the irrelevant features to improve the accuracy and also at the same time used to minimize computation time. This is achieved by selecting only those features that give best performance i.e. improvement in accuracy and reduction in computation time. For optimal selection of feature, a feature selection approach given in [14] which combines information theory is Genetic Algorithm are used. E. Classification A total of 88 mammograms are taken from MIAS database and out of which only 50 samples are kept for training of the neural network classifier [15] and rest 38 is used for testing of the classifier to unknown inputs. Out of 50 mammograms used for training of the classifier, 30 mammograms are having abnormalities and rest 20 is normal. The multilayer Feed Forward Back Propagation Neural Network () is used here as a classifier for training of the samples. The consist of input vector, one hidden layer, one output layer and an output vector. The block diagram of is shown in fig. 2. The hidden layer neurons are varied and tested and performance of the system is evaluated. The whole work is implemented in neural network toolbox of MATLAB. Fig. 1: Classification Steps Used for Mammogram Classification B. Preprocessing of Mammograms Generally enhancement is required to enhance the information contents of the image and here Contrast Limited Adaptive Histogram Equalization (CLAHE) algorithm is used for enhancement of mammogram images. It is an adaptive enhancement method based on adaptive histogram equalization. CLAHE algorithm partitions the image into several contextual regions and then histogram equalization is applied to each region. This results in making the hidden feature of the mammogram more visible. CLAHE is good as compared to Adaptive Histogram Equalization (AHE) enhancement technique [10-11]. C. ROI Selection and Extraction The breast region containing mass or clustered microcalcification is selected or marked as Region of Interest (ROI) and also this ROI does not contain the irrelevant breast tissues. A suitable binary mask is prepared having same dimension corresponding to the ROI. Then using this mask the boundaries of the ROI are extracted Fig. 2: Block Diagram of. 732 International Journal of Computer Science And Technology
3 ISSN : (Online) ISSN : (Print) IJCST Vo l. 4, Is s u e 2, Ap r i l - Ju n e 2013 IV. Results and Discussions After the training of the classifier, it is tested for unknown inputs. For testing of 38 mammograms are used, out of which 21 contains tumor and rest 17 are normal. The performance is evaluated by using regression plots and also four performance evaluation parameters which are sensitivity, specificity, precision and accuracy obtained from confusion matrix of testing data for are used. The regression plots of testing data for with different number of hidden layer neurons are shown below in fig. 3. (c). N=20 (a). N=10 (d). N=25 (b). N=15 (e). N=30 Fig. 3: Regression Plot for with Different Number Neurons in Hidden Layer International Journal of Computer Science And Technology 733
4 IJCST Vo l. 4, Is s u e 2, Ap r i l - Ju n e 2013 ISSN : (Online) ISSN : (Print) After analyzing the different regression plots as shown in fig. 3, it is observed that the plot of with N=20 has the highest value of regression coefficient R which is equal to and thus this network configuration provides good classification results. Four performance parameters which are sensitivity, precision, specificity and accuracy are calculated from confusion matrix. These terms are computed with varying the number of neuron in hidden layer and the results are tabulated below in Table 2. Table 2: Performance Parameters of With Varying Hidden Layer Neuron Parameters Sensitivity Specificity Precision Accuracy N=10 N=15 N=20 N=25 N= From the Table 2, it has been concluded that increasing the number of neuron increase the performance up to a certain limits after which this performance starts decreasing and with N=20 has better performance parameters for testing data. It has sensitivity of around 95.24% with specificity at 94.12% and precision is also high having values of around 95.24% and accuracy nearly 94.74%. V. Conclusion and Future Prospects Mammography is the preferred methods used for breast tumor detection but in some cases radiologists have difficulties in detection of presence of tumor. This paper discusses the effect of for classification of breast tumor. The is trained and tested with having different number of hidden layer neurons. From the experimental results sensitivity of 95.24%, specificity of 94.12% and precision of 95.24% and the most vital classification accuracy of nearly 94.74% was achieved. In future work the accuracy and other results may be improved and other better neural networks may be tested and also classification between tumor types could also be envisaged. References [1] American Cancer Society, Cancer Factsand Figures 2012, American Cancer Society, Atlanta, Ga, USA, [2] Cheng H.D., Shi X.J., et al., Approaches for Automated Detection and Classification of Masses in Mammograms, Pattern Recognition, Vol. 39, pp , [3] Kim J. K., Park H. W., Statistical Textural Features for Detection of Microcalcifications in Digitized Mammograms, IEEE Transaction on Medical Imaging, Vol. 18, No. 3, pp , March [4] Hadjiiski L., Sahiner B., Chan H. P., Petrick N., Helvie M., Classification of Malignant and Benign Masses Based on Hybrid ART2LDA Approach, IEEE Transactions on Medical Imaging, Vol. 18, No. 12, pp December [5] Oliver A., Marti J., Marti R., Bosch A., Freixenet J, A new approach to the classification of mammographic masses and normal breast tissue, The 18th International Conference on Pattern Recognition (ICPR2006), Vol. 4, pp , 2006 [6] Islam M. J., Ahmadi M., Sid-Ahmed M A, An Efficient Automatic Mass Classification Method In Digitized Mammograms Using Artificial Neural Network, International Journal of Artificial Intelligence & Applications (IJAIA), Vol. 1, No. 3, July [7] Vasantha M. et al., Medical Image Feature, Extraction, Selection and Classification, International Journal of Engineering Science and Technology Vol. 2, No. 6, pp , [8] Sokolova M., Lapalme G., A systematic analysis of performance measures for classification tasks, Information Processing and Management Vol.45, No. 4, pp , July [9] Suckling J., et al., The Mammographic Image Analysis Society Digital Mammogram Database, Exerpta Medica. International Congress Series 1069, pp , [10] John B. Z., et al., An Evaluation of the Effectiveness of Adaptive Histogram Equalization for Contrast Enhancement, IEEE transactions on Medical Imaging, Vol. 7. No. 4, December [11] Pisano E. D., et al., Contrast Limited Adaptive Histogram Equalization Image Processing to Improve the Detection of Stimulated Spiculations in Dense Mammograms, Journal of Digital Imaging, Vol. 11, No. 4, pp , November, [12] Eleyan A., Demirel H., Co-occurrence matrix and its statistical features as a new approach for face recognition, Turk J. Elec. Eng. & Comp. Sci., Vol.19, No.1, pp , [13] Haralick R. M., Shanmugam K., Dinstein I., Textural Features for Image Classification, IEEE Transactions on Systems, Man, and Cybernetics, Vol. 3, No. 6, pp , [14] Ludwig O., Nunes U., Novel Maximum-Margin Training Algorithms for Supervised Neural Networks, IEEE Transactions on Neural Networks, Vol. 21, Issue 6, pp , Jun [15] Sanjeet, Rajeshwar Dass, Breast Tumor Classification Techniques, IEEE National Conference on Contemporary Techniques and Technologies in Electronics Eng., pp , March, International Journal of Computer Science And Technology
5 ISSN : (Online) ISSN : (Print) IJCST Vo l. 4, Is s u e 2, Ap r i l - Ju n e 2013 Rajeshwar Dass is pursuing his Ph.D from DCRUST Murthal. He received M.E Degree in ECE from National Institute of Technical Teachers Training and Research Center (NITTTR) Chandigarh in the year B.E(Honors) Degree in ECE from Apeejay College of Engineering Sohna Gurgaon (Affiliated to M.D.U Rohtak) in In August 2004 he joined Dept. of ECE of Apeejay College of Engineering Sohna Gurgaon. He joined Dept. of ECE of Deenbandhu Chhotu Ram University of Science and Technology (D.C.R.U.S.T) Murthal Sonepat (India) as Assistant Professor in October His interest includes Medical Image Processing, Neural Network, Wireless Communication and Soft Computing Techniques. He has contributed 15 technical papers in International Journals and Conferences. He has written a book on wireless communication. He is a life member of ISTE & member of IEEE ( ). Sanjeet Rohilla is pursuing his Mtech from DCRUST Murthal. He received B.E Degree in BME from P.D.M College of Engineering, Bahadurgarh Haryana (Affiliated to M.D.U Rohtak) in His interest includes Medical Image Processing, Neural Network, and Wireless Communication. International Journal of Computer Science And Technology 735
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