Directional wavelet transform in the context of complex quadrature Doppler signals

Author

Aydin, Nizamettin ; Markus, Hugh S.

Author_Institution

Div. of Clinical Neurosci., St. Georges Hosp. Med. Sch., London, UK

Volume

7

Issue

10

fYear

2000

Firstpage

278

Lastpage

280

Abstract

Most Doppler ultrasound systems employ quadrature demodulation techniques at the detection stage. The information concerning flow direction encoded in the phase relationship between in-phase and quadrature phase channels is not obvious at this stage. A method based on the utilization of complex wavelets and negative scales has been described. It eliminates the intermediate processing stages by mapping directional information in the scale domain.

Keywords

Doppler effect; acoustic signal processing; biomedical ultrasonics; demodulation; medical signal processing; wavelet transforms; Doppler ultrasound systems; complex quadrature Doppler signals; directional information; directional wavelet transform; flow direction; in-phase channels; negative scales; phase relationship; quadrature demodulation techniques; quadrature phase channels; scale domain; Fourier transforms; Frequency domain analysis; RF signals; Signal analysis; Signal processing; Signal resolution; Time frequency analysis; Ultrasonic imaging; Wavelet analysis; Wavelet transforms;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/97.870680

Filename

870680