Optimization of Synthetic Aperture Image Quality

Ramin Moshavegh, Jonas Jensen, Carlos Armando Villagómez Hoyos, Matthias Bo Stuart, Martin Christian Hemmsen, Jørgen Arendt Jensen

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    Abstract

    Synthetic Aperture (SA) imaging produces high-quality images and velocity estimates of both slow and fast flow at high frame rates. However, grating lobe artifacts can appear both in transmission and reception. These affect the image quality and the frame rate. Therefore optimization of parameters effecting the image quality of SA is of great importance, and this paper proposes an advanced procedure for optimizing the parameters essential for acquiring an optimal image quality, while generating high resolution SA images. Optimization of the image quality is mainly performed based on measures such as F-number, number of emissions and the aperture size. They are considered to be the most contributing acquisition factors in the quality of the high resolution images in SA. Therefore, the performance of image quality is quantified in terms of full-width at half maximum (FWHM) and the cystic resolution (CTR). The results of the study showed that SA imaging with only 32 emissions and maximum sweep angle of 22 degrees yields a very good image quality compared with using 256 emissions and the full aperture size. Therefore the number of emissions and the maximum sweep angle in the SA can be optimized to reach a reasonably good performance, and to increase the frame rate by lowering the required number of emissions. All the measurements are performed using the experimental SARUS scanner connected to a λ/2-pitch transducer. A wire phantom and a tissue mimicking phantom containing anechoic cysts are scanned using the optimized parameters for the transducer. Measurements coincide with simulations.
    Original languageEnglish
    Title of host publicationProceedings of SPIE
    EditorsNeb Duric, Brecht Heyde
    Number of pages9
    Volume9790
    PublisherSPIE - International Society for Optical Engineering
    Publication date2016
    Article number97900Z
    DOIs
    Publication statusPublished - 2016
    EventSPIE Medical Imaging 2016: Ultrasonic Imaging and Tomography - Town & Country Resort and Convention Cente, San Diego, United States
    Duration: 27 Feb 20163 Mar 2016
    Conference number: 9790
    https://spie.org/conferences-and-exhibitions/past-conferences-and-exhibitions/medical-imaging-2016

    Conference

    ConferenceSPIE Medical Imaging 2016
    Number9790
    LocationTown & Country Resort and Convention Cente
    Country/TerritoryUnited States
    CitySan Diego
    Period27/02/201603/03/2016
    Internet address

    Keywords

    • Synthetic aperture
    • FWHM
    • Cystic resolution
    • Grating lobes
    • Multi objective optimization
    • Pareto optimal
    • Ultrasound imaging

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