Comparison of SVD methods to extract the foetal electrocardiogram from cutaneous electrode signals |
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Authors: | D Callaerts B De Moor J Vandewalle W Sansen G Vantrappen J Janssens |
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Institution: | (1) Department of Electrical Engineering, ESAT Laboratory, Katholieke Universiteit Leuven, Kardinaal Mercierlaan 94, B-3030 Heverlee, Belgium;(2) Present address: Information Systems Lab, Stanford University, 94305 Stanford, CA, USA;(3) Department of Computer Science, Stanford University, 94305 Stanford, CA, USA |
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Abstract: | The paper presents and compares three methods making use of the singular value decomposition (SVD) of a matrix to extract
the foetal electrocardiogram (FECG) from cutaneously recorded electrode signals. The first method constructs a set of orthogonal
foetal signals (the so-called principal foetal signals) from the recordings, but needs electrode positions far from the foetal
heart, in addition to the abdominal electrodes that pick up a mixture of maternal and foetal electrocardiogram. An online
adaptive algorithm has been developed such that a real-time implementation becomes feasible. The second method is a new online
approach to a technique presented by van Oosterom. Although this method has some important drawbacks and is suboptimal as
far as foetal signal-to-noise ratio is concerned. it is still very useful when only a foetal trigger is required, as the signal
obtained is not a complete FECG, Finally, a third method is proposed, based on the generalised SVD and interpreted with the
new concept of oriented signal-to-signal ratio. An online version is also presented for this method and some results are shown. |
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Keywords: | Abdominal foetal electrocardiogram Foetal principal signals GSVD Oriented energy Oriented signal-to-signal SVD |
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