title: A hybrid model of maximum margin clustering method and support vector regression for noninvasive electrocardiographic imaging.
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.
authors.affiliation: School of Information Science and Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China. jiang.mingfeng@hotmail.com
authors.forename: Mingfeng
authors.initials: M
authors.lastname: Jiang
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Yaming
authors.initials: Y
authors.lastname: Wang
authors.forename: Guofa
authors.initials: G
authors.lastname: Shou
authors.forename: Wenqing
authors.initials: W
authors.lastname: Huang
authors.forename: Huaxiong
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D016000:Cluster Analysis; D003198:Computer Simulation; D003952:Diagnostic Imaging / Q000379:methods; D004562:Electrocardiography / Q000379:methods*; D004594:Electrophysiology / Q000379:methods; D006329:Heart Conduction System / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008955:Models, Cardiovascular; D015233:Models, Statistical; D009206:Myocardium / Q000473:pathology; D012044:Regression Analysis; D060388:Support Vector Machine