Ultrasound imaging using transmit wavefront synthesis: Spatial and frequency diversity approach to compounding

Parker O'Brien, Dalong Liu, Emad S. Ebbini

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

Abstract

We have developed a modern array driver employing multi-channel arbitrary waveform generator and linear amplifiers for transmit wavefront synthesis. The system utilizes deep waveform memory that can be configured for switching between transmit patterns seamlessly thus allowing for the use of spatial and frequency diversity in image acquisition. In this paper, we present the first experimental results demonstrating dramatic reduction in sidelobe artifacts as well speckle reduction. Using a 3.5 MHz, 32-element concave array with 40-mm radius of curvature designed for dual-mode operation of therapy and imaging, Single Transmit Focus (STF) and Multiple Transmit Focus (MTF) patterns with varying spatial and frequency characteristics provided a reduction of these artifacts and greater source separation near the focus. Multiple embedded wire-target tissue mimicking phantoms and single leech ganglions in a saline bath were used as imaging targets to test sidelobe reduction; each with Synthetic Aperture (SA) imaging as a validation. Beamformed echo data was incoherently and coherently compounded to achieve sidelobe and incoherent speckle reduction.

Original languageEnglish (US)
Title of host publication2017 IEEE International Ultrasonics Symposium, IUS 2017
PublisherIEEE Computer Society
ISBN (Electronic)9781538633830
DOIs
StatePublished - Oct 31 2017
Event2017 IEEE International Ultrasonics Symposium, IUS 2017 - Washington, United States
Duration: Sep 6 2017Sep 9 2017

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Other

Other2017 IEEE International Ultrasonics Symposium, IUS 2017
CountryUnited States
CityWashington
Period9/6/179/9/17

Bibliographical note

Funding Information:
NIH Grant R01 NS098781 from the National Institute of Neurological Disorders and Stroke (NINDS).

Keywords

  • Coded Excitation
  • Sidelobe Reduction
  • Spatial Compounding
  • Transmit Waveform Synthesis

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