Effect of the beam-vessel angle on the received acoustic signal from blood

Katherine Whittaker Ferrara

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In order to explore the feasibility of algorithms to determine the three dimensional (3D) velocity magnitude from the received ultrasonic blood echo from a single line of sight, the signal from small sample volumes is studied as a function of beam-vessel angle. As opposed to previous treatments of the effect of the beam-vessel angle on the received acoustic signal, a wideband signal is transmitted and the returned signal in each sample volume is analyzed. High-resolution experimental M-mode images of radio-frequency (rf) echo signals are used to visualize the flow in individual regions of interest. These experiments confirm the predictions of a theoretical model for the signal and its second moment. It is shown that the two major effects limiting the correlated signal interval are the spread of axial velocities within the sample volume and the transit time across the lateral beam width. Particularly for small beam-vessel angles, the spread of velocities limits the correlated signal interval. In addition, the experimental results demonstrate that accurate velocity estimation for low volume flow rates and particularly for large beam-vessel angles may involve detection of changes in the correlation magnitude. For low volume flow rates, the shape of the correlation surface can be affected by small regions of blood with a strong scattering intensity located near the initial region of interest.

Original languageEnglish (US)
Pages (from-to)416-428
Number of pages13
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume42
Issue number3
DOIs
StatePublished - May 1995
Externally publishedYes

Fingerprint

blood
vessels
Blood
Acoustics
acoustics
Flow rate
echoes
flow velocity
Ultrasonics
Scattering
intervals
transit time
line of sight
radio frequencies
ultrasonics
Experiments
broadband
moments
high resolution
predictions

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics

Cite this

Effect of the beam-vessel angle on the received acoustic signal from blood. / Ferrara, Katherine Whittaker.

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 42, No. 3, 05.1995, p. 416-428.

Research output: Contribution to journalArticle

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