Computational and Mathematical Methods in Medicine
Volume 2012 (2012), Article ID 436281, 9 pages
http://dx.doi.org/10.1155/2012/436281
Research Article

A Hybrid Model of Maximum Margin Clustering Method and Support Vector Regression for Noninvasive Electrocardiographic Imaging

Mingfeng Jiang,1 Feng Liu,2 Yaming Wang,1 Guofa Shou,3 Wenqing Huang,1 and Huaxiong Zhang1

1School of Information Science and Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China
2School of Information Technology and Electrical Engineering, University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
3School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA

Received 3 August 2012; Accepted 8 October 2012

Academic Editor: Dingchang Zheng

Copyright © 2012 Mingfeng Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Noninvasive electrocardiographic imaging, such as the reconstruction of myocardial transmembrane potentials (TMPs) distribution, can provide more detailed and complicated electrophysiological information than the body surface potentials (BSPs). However, the noninvasive reconstruction of the TMPs from BSPs is a typical inverse problem. In this study, this inverse ECG problem is treated as a regression problem with multi-inputs (BSPs) and multioutputs (TMPs), which will be solved by the Maximum Margin Clustering- (MMC-) Support Vector Regression (SVR) method. First, the MMC approach is adopted to cluster the training samples (a series of time instant BSPs), and the individual SVR model for each cluster is then constructed. For each testing sample, we find its matched cluster and then use the corresponding SVR model to reconstruct the TMPs. Using testing samples, it is found that the reconstructed TMPs results with the MMC-SVR method are more accurate than those of the single SVR method. In addition to the improved accuracy in solving the inverse ECG problem, the MMC-SVR method divides the training samples into clusters of small sample sizes, which can enhance the computation efficiency of training the SVR model.