DocumentCode :
2267083
Title :
Theory of true-velocity duplex imaging using a single transducer
Author :
Kadah, Yasser M. ; Tewfik, Ahmed H.
Author_Institution :
Biomed. Eng. Program, Minnesota Univ., Minneapolis, MN, USA
Volume :
1
fYear :
1995
fDate :
23-26 Oct 1995
Firstpage :
629
Abstract :
We study the B-mode/Doppler duplex imaging problem. We begin by looking at the problem of determining the true velocity vector only. We develop a model for the power spectrum of a signal reflected by a line of point scatterers with a Poisson distribution. We show that with circularly symmetric apertures it is possible to use the expression of that power spectrum to determine the true velocity vector from a single excitation and two measurements. We also describe an illumination configuration that guarantees that the velocity estimation process is range-invariant. We conclude the paper by studying the problem of simultaneously estimating the range and true velocity of a flow. In particular, we show that this problem is completely characterized by a generalized range-2-D Doppler ambiguity function that depends on the excitation signal and the transducer geometry
Keywords :
Doppler measurement; Poisson distribution; flow measurement; spectral analysis; ultrasonic imaging; ultrasonic scattering; ultrasonic transducers; velocity measurement; B-mode/Doppler duplex imaging; Doppler ultrasound flowmeters; Poisson distribution; circularly symmetric apertures; generalized range 2D Doppler ambiguity function; illumination configuration; measurements; point scatterers; power spectrum; range estimation; range invariant velocity estimation; reflected signal; true velocity duplex imaging; true velocity vector; Apertures; Biomedical engineering; Biomedical imaging; Biomedical transducers; Equations; Frequency estimation; Transmitters; Ultrasonic imaging; Ultrasonic transducers; Velocity measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Image Processing, 1995. Proceedings., International Conference on
Conference_Location :
Washington, DC
Print_ISBN :
0-8186-7310-9
Type :
conf
DOI :
10.1109/ICIP.1995.531445
Filename :
531445
Link To Document :
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