Comput Math Methods Med - Probabilistic source separation for robust fetal electrocardiography.

Tópicos

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Resumo

Blind source separation (BSS) techniques are widely used to extract signals of interest from a mixture with other signals, such as extracting fetal electrocardiogram (ECG) signals from noninvasive recordings on the maternal abdomen. These BSS techniques, however, typically lack possibilities to incorporate any prior knowledge on the mixing of the source signals. Particularly for fetal ECG signals, knowledge on the mixing is available based on the origin and propagation properties of these signals. In this paper, a novel source separation method is developed that combines the strengths and accuracy of BSS techniques with the robustness of an underlying physiological model of the fetal ECG. The method is developed within a probabilistic framework and yields an iterative convergence of the separation matrix towards a maximum a posteriori estimation, where in each iteration the latest estimate of the separation matrix is corrected towards a tradeoff between the BSS technique and the physiological model. The method is evaluated by comparing its performance with that of FastICA on both simulated and real multichannel fetal ECG recordings, demonstrating that the developed method outperforms FastICA in extracting the fetal ECG source signals.

Resumo Limpo

blind sourc separ bss techniqu wide use extract signal interest mixtur signal extract fetal electrocardiogram ecg signal noninvas record matern abdomen bss techniqu howev typic lack possibl incorpor prior knowledg mix sourc signal particular fetal ecg signal knowledg mix avail base origin propag properti signal paper novel sourc separ method develop combin strength accuraci bss techniqu robust under physiolog model fetal ecg method develop within probabilist framework yield iter converg separ matrix toward maximum posteriori estim iter latest estim separ matrix correct toward tradeoff bss techniqu physiolog model method evalu compar perform fastica simul real multichannel fetal ecg record demonstr develop method outperform fastica extract fetal ecg sourc signal

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