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Frequency and Scale Domain Analysis of Complex Quadrature Embolic Doppler UltrasoundSignals
 

Summary: Frequency and Scale Domain Analysis of Complex Quadrature
Embolic Doppler UltrasoundSignals
Nizamettin Aydin, Tughrul Arslan
School of Engineering and Electronics, University of Edinburgh, Edinburgh, UK
naydin@ee.ed.ac.uk
Abstract
Early and accurate detection of emboli is important
for monitoring of preventive therap? in stroke-prone
patients. One of the problems in detection of emboli is
the identification of an embolic signal caused by very
small emboli. The amplitude of the embolic signal may
be so small that advanced processing methods are
required to distinguish these signals from Doppler
signals arising from red blood cells. The windowed
Fourier transform has been widely used by commercial
Doppler ultrasonic systems. An alternative approach is
the wavelet transform. Here, we present comparison of
time-frequency (based on complex fast Fourier
transform) and time-scale (based on, complex wavelet
transform) analj'sis. The results reveal thar the wavelet

  

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

 

Collections: Engineering