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/MI/conferencedetails/ultrasonic-imaging

Conference

ConferenceSPIE Medical Imaging 2016
Number9790
LocationTown & Country Resort and Convention Cente
CountryUnited 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

Cite this

Moshavegh, R., Jensen, J., Villagómez Hoyos, C. A., Stuart, M. B., Hemmsen, M. C., & Jensen, J. A. (2016). Optimization of Synthetic Aperture Image Quality. In N. Duric, & B. Heyde (Eds.), Proceedings of SPIE (Vol. 9790). [97900Z] SPIE - International Society for Optical Engineering. https://doi.org/10.1117/12.2216506