NDLI: True velocity estimation using the correlation technique [blood flow]

Content Provider	IEEE Xplore Digital Library
Author	Kadah, Y.M. Tewfik, A.H.
Copyright Year	1995
Description	Author affiliation: Biomed. & Electr. Eng. Programs, Minnesota Univ., Minneapolis, MN, USA (Kadah, Y.M.)
Abstract	One of the most important biomedical applications of ultrasound is its use in the detection, measurement and mapping of blood flow. The correlation technique has been shown to give a better accuracy velocity estimation than the conventional frequency domain methods. This technique requires two consecutive echo signals in addition to the flow angle to produce the magnitude of the velocity vector based on transit-time calculations. The effect of the lateral beam pattern on the results has not been sufficiently treated in the literature. In this work, we present a new generalized formulation of the correlation technique that incorporates both axial and lateral beam characteristics. We show that the location of the correlation function peak given in the literature is a special case of this model when the field is a plane wave. Also, we show that for other practical beam forms, the lateral beam form introduces an angle-dependent bias to the axial velocity measurements obtained with the classical formula. By properly choosing the source aperture and excitation signal, we derive a formula for lateral displacement estimation from correlation peak locations and magnitudes. This displacement can be used directly to estimate the lateral velocity component and allow the calculation of the complete velocity vector.
Starting Page	1545
Ending Page	1548
File Size	279681
Page Count	4
File Format	PDF
ISBN	0780329406
ISSN	10510117
DOI	10.1109/ULTSYM.1995.495849
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Blood flow Velocity measurement Biomedical measurements Signal resolution Doppler shift Spatial resolution Ultrasonic imaging Apertures Fluid flow measurement Image resolution
Content Type	Text
Resource Type	Article

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