|Year : 2017 | Volume
| Issue : 3 | Page : 340-344
An investigation of Bayes algorithm and neural networks for identifying the breast cancer
E Udayakumar1, S Santhi1, P Vetrivelan2
1 Department of ECE, KIT-Kalaignarkarunanidhi Institute of Technology, Coimbatore, Tamil Nadu, India
2 Department of ECE, PSG Institute of Technology and Applied Research, Coimbatore, Tamil Nadu, India
|Date of Web Publication||17-Oct-2017|
Assistant Professor, Department of ECE, KIT-Kalaignarkarunanidhi Institute of Technology, Coimbatore, Tamil Nadu
Source of Support: None, Conflict of Interest: None
Context: Breast cancer is a biggest threat to women. X-ray mammography is the most effective method for early detection and screening of breast cancer. It is a tough challenge for the radiologist in reading mammography since it does not provide consistent result every time. Aim: To improve the primary sign of this disease, computer-aided diagnosis schemes have been developed. Using monitor, digital images of mammography are displayed and they can be lightened or darkened before they are printed on the film. Time factor is important to identify the abnormality in body such as breast cancer and lung cancer. Hence, to detect the tissues and treatment stages, image-processing techniques are improved in several medical areas. In this project, using low-level preprocessing techniques and image segmentation, the breast cancer detection is done. Methods: With the help of Bayes algorithm and neural networks (NNs), the type of the mammogram and stages is identified. For segmentation process, region-growing algorithm is used, which helps to find the affected portion, i.e., region of interest. Gray-level co-occurrence matrix (GLCM) and texture feature are used for feature extraction. Results: Bayes algorithm is used for probability of identification, whereas NNs is used to reduce the probability level from 0–1000 to 0–1 in case of classification.
Keywords: Artificial neural network, computer-aided diagnosis, gray-level co-occurrence matrix, mammogram, region of interest
|How to cite this article:|
Udayakumar E, Santhi S, Vetrivelan P. An investigation of Bayes algorithm and neural networks for identifying the breast cancer. Indian J Med Paediatr Oncol 2017;38:340-4
|How to cite this URL:|
Udayakumar E, Santhi S, Vetrivelan P. An investigation of Bayes algorithm and neural networks for identifying the breast cancer. Indian J Med Paediatr Oncol [serial online] 2017 [cited 2019 Sep 17];38:340-4. Available from: http://www.ijmpo.org/text.asp?2017/38/3/340/216833
| Introduction|| |
In worldwide, breast cancer is most commonly found in women. If the disease is found in early stages, it is curable. The causes of this disease are still unknown, hence primary prevention is impossible. The epidemiological factors such as early menarche and late menopause, family history, dietary, environmental factors, and genetic factors are the symptoms for the development of breast carcinoma.
Mostly women are affected by the breast cancer, but men to get affected rarely. The major causes for women death are breast cancer. Early diagnostic techniques are improved for women's life quality. For screening and early diagnostic, the main test used in mammography which is convenient, inexpensive, and least choice in early detection of breast cancer. Most of the major changes of the breast cancer can be depicted by mammograms. Mass, spicular lesions, and calcification content are the primary radiography sign of cancer.,
Bayesian networks help to find the probabilistic relationship between findings and diseases. This project is about diagnosing breast diseases by mammography, with the help of radiological findings observed on mammography. To run the features extracted on a mass and features for the classification of lesions, selection is implemented. Two crucial points in the steps are method of data normality to be used with no assumption and physical meaning of each feature needed for preservation.
| System Design|| |
A set of features related to the geometry of boundary and structure inside it is computed once the mass boundary is identified called feature extraction. This is mainly used to simplify accurately the resource required to describe large set of data. The information from the original data and representing it in lower dimensionality space is done by features extraction , and the selection method.
Starting from the values of the ranked features classification procedures allows assigning a malignancy index to each detected mass. The area under the curve that is the area under the receiver operating characteristic curve is computed, by which validation of steps is performed.,, An image is partitioned into distinct regions, containing that each pixel with similar attributes is done by segmentations. A simple region-based image segmentation method is region growing. Since it involves the selection of initial seed point's region, growing method is also classified as a pixel-based image segmentation method [Figure 1].
The family of statistical learning algorithms is neural network (NN) in machine learning and cognitive science, artificial NNs (ANNs) which are inspired by biological NNs. They are mostly used in estimation of functions which depends on a large numbers of unknown inputs. A system of interconnect “neurons” is generally presented by ANNs which can compute values from inputs and capable of machine learning as well as pattern recognition to their adaptive nature.
An information-processing paradigm is an ANN that is inspired by the way biological nervous system is processing brain information. The novel structure of the information-processing system is the key element of this paradigm. To solve the specific problems, a large number of highly interconnected elements work. Pattern recognition and data classification are the specific application for which ANN is configured done by through learning process. Learning involves adjustment to the synaptic connection that exists between the neurons in biological systems.
A simple technique for construction classifier is naive Bayes model which assigns class label to problem instance, represented as vectors of features values, where class label is drawn from finite set. It is family of algorithm based on the common principle, and all naive Bayes classifiers assume that the particular feature value is independent of the any other feature values of the class variables. For example, consider an apple, red, round, and diameter is 3”. The colors, roundness, and diameter features are independently contributed for a naive Bayes classifier. In practical application, parameter estimation for naive Bayes model uses the maximum method.
Only a small amount of training data are required to estimate the parameter necessary for classification which is the advantage of naive Bayes model. A family of simple probabilistic classifiers based on applying Bayes theorem with strong independent assumption between the features is done in machine learning. With more advanced methods including support vector machine, this domain is found to be competitive, with appropriate preprocessing technique. An automatic medical diagnosis is one of its applications.
| Results and Discussion|| |
The image is used to find the image analysis techniques for extracting all the features from mammogram image to find the difference between normal and diseased samples. Then, the image is used to preprocessing stage. The removal of pepper and salt noise and conversion to gray scale is preprocessing. The input image of mammogram is shown in [Figure 2].
To enhance the input image, histogram equalization method is used. Histogram equalization harmonizes the image luminosity level distribution in that each of the histogram levels tends to increase the contrast level toward the same number of pixels. This is normally used to maximize the image luminance. Histogram equalization is a method in image processing of contrast adjustment using the image histogram. This method usually increases the global contrast of many images. The enhanced image is shown in [Figure 3].
Image segmentation is subdividing a digital image into many equal segments. Image segmentation is typically used to locate objects and boundaries (lines, curves, etc.) in images, as shown in [Figure 4]. Region-growing algorithm is used to segment the affected region. It is done by considering the seed node and then comparing the neighboring pixels and growing the region according to it.
Feature extraction is used to extract the several features in an image.,,, It is very important to get information from original data and small dimensionality space, where the feature extraction of test image is shown in [Figure 5].
The unknown samples of image are opened by MATLAB, as shown in [Figure 6].
The image classification is that all pixels in a digital image are classified into several classes. The aim of this classification is to find a gray level, features produced in an image by object, or type of land to cover these features actually represent on the ground. Every image is classified according to its visual content. Bayes algorithm and NN are used as classifiers. The classification of unknown samples is shown in [Figure 7].
Unknown samples for performance calculation
The unknown samples for performance calculation are shown in [Figure 8].
Feature extraction of multiple samples
The input data are big and the data will be represented in reduced set of features. Transforming the input data into the set of features is called feature extraction. In this both, gray-level co-occurrence matrix and wavelet texture features are analyzed, as shown in [Figure 9].
Classification of multiple samples
The classification of multiple samples using NNs is shown in [Figure 10].
The accuracy is nothing, but the items classified correctly\all items classified. It is the percentage of test set tuples that are correctly classified. It is the difference (subtract) between the accepted value and the experimental value, then divide by the accepted value. The bar chart of performance accuracy is shown in [Figure 11].
The error rate is the comparison of existing and proposed methods, as shown in [Figure 12]. It is the calculation of error rate where the total numbers of unequal pairs of data elements are divided by one source of number of input data elements.
| Conclusion|| |
The importance of knowing our health condition has increased with the development in science and technology, where mammogram plays a critical role. The identification of mammogram using Bayes algorithm and NN which helps to spot the lesions level and cancer stage is explained clearly in this project. The cancer with high accuracy can be found out the help of this module in less time. The main advantages of this module are that it reduces the wrong detection and reduces number of test to be taken in identification of cancer. The treatment can be done at the right time if the beginning stage of cancer is identified. Using wavelet texture feature in feature extraction, the accuracy level is increased. For this probability, Bayes algorithm is used. The analysis is made based on the performance of the project and result is improved.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8], [Figure 9], [Figure 10], [Figure 11], [Figure 12]