Detección Robusta de los Puntos AO e IM en el Seismocardiograma Usando CWT (Robust Detection of AO and IM Points in the Seismocardiogram Using CWT)

Ilen Rivero Pouymiró (ilen@uo.edu.cu)2, Ernesto Valdés Córdova (ernestovc1990@gmail.com)1, Fernando Eudaldo Valdés Pérez (fvaldes@uo.edu.cu)2


1Empresa Radiocuba, Santiago de Cuba
2Universidad de Oriente

This paper appears in: Revista IEEE América Latina

Publication Date: Nov. 2016
Volume: 14,   Issue: 11 
ISSN: 1548-0992


Abstract:
The seismocardiogram (SCG) records the mechanical vibrations resulting from cardiac movements, and it is acquired on the chest. The SCG is a non-invasive and inexpensive technique for monitoring cardiac activity. This paper propose a new method to detect the points associated with the opening of the aortic valve (AO) and isovolumic moment (IM) at the SCG, without using the reference of electrocardiogram (ECG) signal. This method uses continuous wavelet transform (CWT) as a base and a decision rule as a first approximation, followed by a fine position detection points. The performance achieved by the detector is 99% of sensitivity, and error less than 3%. Detector performance was evaluated for several wavelets, and the best results were obtained with the Daubechies wavelet of order 4. Finally, it was evaluated robustness to noise with good results. The simplicity of the proposed method allows a starting point to segment the SCG and reliable use for monitoring elderly people at home.

Index Terms:
Aortic valve opening (AO), continuous wavelet transform (CWT), electrocardiogram (ECG), isovolumic moment (IM), seismocardiogram (SCG)   


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