Preliminary examples of 3D vector flow imaging

Michael Johannes Pihl, Matthias Bo Stuart, Borislav Gueorguiev Tomov, Jens Munk Hansen, Morten Fischer Rasmussen, Jørgen Arendt Jensen

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    Abstract

    This paper presents 3D vector flow images obtained using the 3D Transverse Oscillation (TO) method. The method employs a 2D transducer and estimates the three velocity components simultaneously, which is important for visualizing complex flow patterns. Data are acquired using the experimental ultrasound scanner SARUS on a flow rig system with steady flow. The vessel of the flow-rig is centered at a depth of 30 mm, and the flow has an expected 2D circular-symmetric parabolic prole with a peak velocity of 1 m/s. Ten frames of 3D vector flow images are acquired in a cross-sectional plane orthogonal to the center axis of the vessel, which coincides with the y-axis and the flow direction. Hence, only out-of-plane motion is expected. This motion cannot be measured by
    typical commercial scanners employing 1D arrays. Each frame consists of 16 flow lines steered from -15 to 15 degrees in steps of 2 degrees in the ZX-plane. For the center line, 3200 M-mode lines are acquired yielding 100 velocity proles. At the center of the vessel, the mean and standard deviation of the estimated velocity vectors are (vx, vy, vz) = (-0.026, 95, 1.0)(8.8, 6.2, 0.84) cm/s compared to the expected (0.0, 96, 0.0) cm/s. Relative to the velocity magnitude this yields standard deviations of (9.1, 6.4, 0.88) %, respectively. Volumetric flow rates were estimated for all ten frames yielding 57.92.0 mL/s in comparison with 56.2 mL/s measured by a commercial magnetic flow meter. One frame of the obtained 3D vector flow data is presented and visualized using three
    alternative approaches. Practically no in-plane motion (vx and vz) is measured, whereas the out-of-plane motion (vy) and the velocity magnitude exhibit the expected 2D circular-symmetric parabolic shape. It shown that the ultrasound method is suitable for real-time data acquisition as opposed to magnetic resonance imaging (MRI). The results demonstrate that the 3D TO method is capable of performing 3D vector flow imaging.
    Original languageEnglish
    Title of host publicationProceedings of SPIE : Medical Imaging 2013: Ultrasonic Imaging, Tomography, and Therapy
    Number of pages12
    Volume8675
    PublisherSPIE - International Society for Optical Engineering
    Publication date2013
    Publication statusPublished - 2013
    EventSPIE Medical Imaging 2013 - Disney's Coronado Springs Resort, Lake Buena Vista, United States
    Duration: 9 Feb 201314 Feb 2013

    Conference

    ConferenceSPIE Medical Imaging 2013
    LocationDisney's Coronado Springs Resort
    Country/TerritoryUnited States
    CityLake Buena Vista
    Period09/02/201314/02/2013
    SeriesProceedings of SPIE - The International Society for Optical Engineering
    ISSN0277-786X

    Keywords

    • Medical ultrasound
    • Velocity estimation
    • Three-dimensional vector ow imaging
    • 3D velocities
    • Volumetric ow rate
    • Transverse oscillation method
    • Spatial quadrature

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