NDLI: Modified wavelet bicoherence as a diagnostic tool for very high frequency peaks in cardiovascular signals of normal and heart transplant subjects

Content Provider	IEEE Xplore Digital Library
Author	Keissar, K. Gilad, O. Akselrod, S.
Copyright Year	2009
Description	Author affiliation: Deceased 2008, USA (Akselrod, S.) \|\| Abramson Center for Medical Physics, Sakler Faculty of Exact Sciences, Tel-Aviv University, Israel (Keissar, K.; Gilad, O.)
Abstract	Wavelet bicoherence (WB) provides insight into nonlinear interactions and can provide information about interacting oscillations in the cardiovascular system, especially in the very high frequency (VHF) band. We suggest a new normalization for the WB estimator which enables a combined threshold criteria reducing false positive error from 5% to below 1%. Alternatively, we suggest a modified wavelet bicoherence (MWB) based on frequency shifts using Hilbert transform and a mixer which enables an optimal time resolution. Simulations were performed to assess the threshold values and to support the usability of the proposed methods. Implementation on heart rate signals of heart transplant (HT) and normal subjects indicated improved sensitivity as compared to Fourier based bicoherence. Significant peaks were found in the VHF band in 60% of the HT group and, for the first time, in normal subjects, in 40% of the control group.
Starting Page	677
Ending Page	680
File Size	275819
Page Count	4
File Format	PDF
ISBN	9781424472819
ISSN	02766547
e-ISBN	9781424472826
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Computers in Cardiology(CinC)
Subject Keyword	Cardiology Frequency estimation Continuous wavelet transforms Heart rate Wavelet transforms Wavelet analysis Medical diagnostic imaging Physics Cardiovascular system Wavelet domain
Content Type	Text
Resource Type	Article

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