Implementation of swept synthetic aperture imaging

Nick Bottenus, Marko Jakovljevic, Emad Boctor, Gregg E. Trahey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ultrasound imaging of deep targets is limited by the resolution of current ultrasound systems based on the available aperture size. We propose a system to synthesize an extended effective aperture in order to improve resolution and target detectability at depth using a precisely-tracked transducer swept across the region of interest. A Field II simulation was performed to demonstrate the swept aperture approach in both the spatial and frequency domains. The adaptively beam-formed system was tested experimentally using a volumetric transducer and an ex vivo canine abdominal layer to evaluate the impact of clutter-generating tissue on the resulting point spread function. Resolution was improved by 73% using a 30.8 degree sweep despite the presence of varying aberration across the array with an amplitude on the order of 100 ns. Slight variations were observed in the magnitude and position of side lobes compared to the control case, but overall image quality was not significantly degraded as compared by a simulation based on the experimental point spread function. We conclude that the swept aperture imaging system may be a valuable tool for synthesizing large effective apertures using conventional ultrasound hardware.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2015
Subtitle of host publicationUltrasonic Imaging and Tomography
EditorsNeb Duric, Johan G. Bosch
PublisherSPIE
ISBN (Electronic)9781628415094
DOIs
StatePublished - Jan 1 2015
EventMedical Imaging 2015: Ultrasonic Imaging and Tomography - Orlando, United States
Duration: Feb 22 2015Feb 23 2015

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume9419
ISSN (Print)1605-7422

Other

OtherMedical Imaging 2015: Ultrasonic Imaging and Tomography
CountryUnited States
CityOrlando
Period2/22/152/23/15

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Keywords

  • Medical ultrasound
  • resolution
  • swept aperture
  • synthetic aperture
  • transducer motion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

Cite this

Bottenus, N., Jakovljevic, M., Boctor, E., & Trahey, G. E. (2015). Implementation of swept synthetic aperture imaging. In N. Duric, & J. G. Bosch (Eds.), Medical Imaging 2015: Ultrasonic Imaging and Tomography [94190H] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9419). SPIE. https://doi.org/10.1117/12.2081434