Embolic Doppler ultrasound signal detection using discrete wavelet transform

IEEE Transactions on Information Technology in Biomedicine : a Publication of the IEEE Engineering in Medicine and Biology Society
N AydinH S Markus

Abstract

Asymptomatic circulating emboli can be detected by Doppler ultrasound. Embolic Doppler ultrasound signals are short duration transient like signals. The wavelet transform is an ideal method for analysis and detection of such signals by optimizing time-frequency resolution. We propose a detection system based on the discrete wavelet transform (DWT) and study some parameters, which might be useful for describing embolic signals (ES). We used a fast DWT algorithm based on the Daubechies eighth-order wavelet filters with eight scales. In order to evaluate feasibility of the DWT of ES, two independent data sets, each comprising of short segments containing an ES (N = 100), artifact (N = 100) or Doppler speckle (DS) (N = 100), were used. After applying the DWT to the data, several parameters were evaluated. The threshold values used for both data sets were optimized using the first data set. While the DWT coefficients resulting from artifacts dominantly appear at the higher scales (five, six, seven, and eight), the DWT coefficients at the lower scales (one, two, three, and four) are mainly dominated by ES and DS. The DWT is able to filter out most of the artifacts inherently during the transform process. For the first data set, 98 ou...Continue Reading

References

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Citations

Sep 28, 2007·Annals of Biomedical Engineering·Andreas VossHans R Figulla
Sep 21, 2013·Medical & Biological Engineering & Computing·Gorkem Serbes, Nizamettin Aydin
Nov 13, 2014·Medical & Biological Engineering & Computing·Gorkem SerbesNizamettin Aydin
Feb 29, 2008·Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging·Him Shing NgPeter Johansen
Apr 12, 2013·International Journal for Numerical Methods in Biomedical Engineering·Ivo B GonçalvesM M M Moura
Jan 13, 2015·IEEE Journal of Biomedical and Health Informatics·Musa PekerDursun Delen
Jan 18, 2017·Computational and Mathematical Methods in Medicine·Maroun GeryesJean-Marc Girault
Jan 11, 2017·Australasian Physical & Engineering Sciences in Medicine·Karim FerroudjiAyache Bouakaz
Feb 17, 2017·Medical & Biological Engineering & Computing·Blaise Kévin GuépiéPhilippe Delachartre
Oct 17, 2007·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·H S NgP Johansen

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