Ultrasound Doppler system with swept frequency excitation

Author

Pedersen, P.C. ; Wilhjelm, J.E.

Author_Institution

Worcester Polytech. Inst., MA, USA

fYear

1991

fDate

4-5 Apr 1991

Firstpage

237

Lastpage

238

Abstract

A Doppler system based on frequency modulated excitation signals (FM Doppler) in the form of coherent linear sweeps is described. Both depth and velocity information can be extracted from the received signals by either of two processing schemes: phase shift measurement (PSM) and frequency (or spectral) shift measurement (FSM). The PSM is similar to the processing used in the conventional pulsed wave (PW) Doppler while the FSM is performed through cross-correlation of the magnitude frequency spectra of consecutive demodulated received signals. The FM Doppler system is characterized by low peak power, the possibility for spectral compensation of attenuation and transducer effects, and-for the FSM processing-no aliasing problems

Keywords

Doppler effect; biomedical equipment; biomedical ultrasonics; aliasing problems; attenuation; coherent linear sweeps; depth information; medical ultrasound; phase shift measurement; spectral compensation; swept frequency excitation; transducer effects; ultrasound Doppler system; velocity information; Attenuation; Chirp modulation; Data mining; Frequency measurement; Frequency modulation; Phase measurement; Signal processing; Ultrasonic imaging; Ultrasonic variables measurement; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Bioengineering Conference, 1991., Proceedings of the 1991 IEEE Seventeenth Annual Northeast

Conference_Location

Hartford, CT

Print_ISBN

0-7803-0030-0

Type

conf

DOI

10.1109/NEBC.1991.154662

Filename

154662