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182 IEEE TRANSACTIONS ON INFORMATION TECHNOLOGY IN BIOMEDICINE, VOL. 8, NO. 2, JUNE 2004 Embolic Doppler Ultrasound Signal Detection Using
 

Summary: 182 IEEE TRANSACTIONS ON INFORMATION TECHNOLOGY IN BIOMEDICINE, VOL. 8, NO. 2, JUNE 2004
Embolic Doppler Ultrasound Signal Detection Using
Discrete Wavelet Transform
Nizamettin Aydin, Member, IEEE, Farokh Marvasti, Senior Member, IEEE, and Hugh 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 parame-
ters, 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 ( = 100), artifact ( =
100) or Doppler speckle (DS) ( = 100), were used. After ap-
plying 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 arti-
facts dominantly appear at the higher scales (five, six, seven, and

  

Source: Arslan, Tughrul - School of Engineering and Electronics, University of Edinburgh

 

Collections: Engineering