Computer aided diagnosis of ECG data on the least square support vector machine

Department of Electrical and Electronics Engineering, Selcuk University, 42075 Konya, Turkey
Digital Signal Processing (Impact Factor: 1.26). 01/2008; 18(1):25-32. DOI: 10.1016/j.dsp.2007.05.006
Source: DBLP


In this paper we describe a technique that has successfully classified arrhythmia from an ECG dataset using a least square support vector machine (LSSVM). LSSVM was applied to the ECG dataset to distinguish between healthy persons and diseased persons (arrhythmia). The LSSVM classifier trained with four train-test parts including a training-to-test split of 50–50%, a training-to-test split of 70–30%, and a training-to-test split of 80–20%. We have used the classification accuracy, sensitivity and specificity analysis, and ROC curves to test the performance of LSSVM classifier on the detection of ECG arrhythmia. The classification accuracies obtained are 100% for all the training-to-test splits. These results show that the proposed method is more promising than previously reported classification techniques. The results suggest that the proposed method can be used to enhance the performance of a new intelligent assistance diagnosis system.

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    • "For obtaining satisfactory predictive classification accuracy, we can use various SVM kernel parameters. Therefore, it needs to be a convenient and efficient kernel parameter setting method [3]. "

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    • "The ECG signals have been widely used for detection and diagnosis of MI [6], [7]. However, the ECG signals are examined manually by cardiologists or specialized device only available in large hospitals [11]. Visual inspection of the whole ECG trend even for one individual is cumbersome. "
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    ABSTRACT: Portable, Wearable and Wireless electrocardiogram (ECG) Systems have the potential to be used as point-of-care for cardiovascular disease diagnostic systems. Such wearable and wireless ECG systems require automatic detection of cardiovascular disease. Even in the primary care, automation of ECG diagnostic systems will improve efficiency of ECG diagnosis and reduce the minimal training requirement of local healthcare workers. However, few fully automatic myocardial infarction (MI) disease detection algorithms have well been developed. This paper presents a novel automatic MI classification algorithm using second order ordinary differential equation (ODE) with time varying coefficients, which simultaneously captures morphological and dynamic feature of highly correlated ECG signals. By effectively estimating the unobserved state variables and the parameters of the second order ODE, the accuracy of the classification was significantly improved. The estimated time varying coefficients of the second order ODE were used as an input to the support vector machine (SVM) for the MI classification. The proposed method was applied to the PTB diagnostic ECG database within Physionet. The overall sensitivity, specificity, and classification accuracy of 12 lead ECGs for MI binary classifications were 98.7%, 96.4% and 98.3%, respectively. We also found that even using one lead ECG signals, we can reach accuracy as high as 97%. Multiclass MI classification is a challenging task but the developed ODE approach for 12 lead ECGs coupled with multiclass SVM reached 96.4% accuracy for classifying 5 subgroups of MI and healthy controls.
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    • "An exploration of the applicability of the image pre-processing, feature extraction, classification and segmentation techniques in brain disorder diagnosis in MR images is given by [2]. Evaluation measures for patterns are described by [3] [4]. H. Selvaraj et al. [5] proposed a classification technique based on Least Squares Support Vector Machines (LS-SVM) using Radial Basis Function (RBF) kernels classifier for the classification of normal and abnormal brain slices. "
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    ABSTRACT: In Medical Diagnosis, Magnetic Resonance Image (MRI) plays a momentous role. MRI is based on the physical and chemical principles of Nuclear Magnetic Resonance (NMR), a technique used to gain information about the nature of molecules. Retrieving a high quality MR Image for a medical diagnosis is critical. So denoising of Magnetic Resonance (MR) images and making them easy for human understanding form is a challenge. This research work presents an efficient Hybrid Abnormal Detection Algorithm (HADA) to detect the abnormalities in any part of the human body by MRIs. The proposed technique includes five stages: Noise Reduction, Smoothing, Feature Extraction, Feature Reduction and Classification. The proposed algorithm has been implemented and Classification accuracy of 98.80% has been achieved. The result shows that the proposed technique is robust and effective compared to other recent works. The system developed using the proposed algorithm will be a good computer aided diagnosis and decision making system in healthcare.
    Central European Journal of Computer Science 09/2013; 3(3):117-128. DOI:10.2478/s13537-013-0107-z
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