Experimental investigation of synthetic aperture flow angle estimation

Niels Oddershede, Jørgen Arendt Jensen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    Currently synthetic aperture flow methods can find the correct velocity magnitude, when the flow direction is known. To make a fully automatic system, the direction should also be estimated. Such an approach has been suggested by Jensen (2004) based on a search of the highest cross-correlation as a function of velocity and angle. This paper presents an experimental investigation of this velocity angle estimation method based on a set of synthetic aperture flow data measured using our RASMUS experimental ultrasound system. The measurements are performed for flow angles of 60, 75, and 90 deg. with respect to the axial direction, and for constant velocities with a peak of 0.1 m/s and 0.2 m/s. The implemented synthetic aperture imaging method uses virtual point sources in front of the transducer, and recursive imaging is used to increase the data rate. A 128 element linear array transducer is used for the experiments, and the emitted pulse is a 20 micro sec. chirp, linearly sweeping frequencies from approximately 3.5 to 10.5 MHz. The flow angle could be estimated with an average bias up to 5.0 deg., and a average standard deviation between 0.2 deg. and 5.2 deg. Using the angle estimates, the velocity magnitudes were estimated with average standard deviations no higher than 6.5% relative to the peak velocity.
    Original languageEnglish
    Title of host publicationProceedings of SPIE Medical Imaging meeting : Ultrasonic Imaging and Signal Processing
    Volume5750
    PublisherSPIE - International Society for Optical Engineering
    Publication date2005
    Pages417-426
    DOIs
    Publication statusPublished - 2005
    EventSPIE Medical Imaging 2005: Ultrasonic Imaging and Signal Processing - San Diego, United States
    Duration: 12 Feb 200517 Feb 2005
    Conference number: 5750
    http://proceedings.spiedigitallibrary.org/volume.aspx?volumeid=2934

    Conference

    ConferenceSPIE Medical Imaging 2005
    Number5750
    Country/TerritoryUnited States
    CitySan Diego
    Period12/02/200517/02/2005
    Internet address

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