Improved plane-wave high frame rate imaging using retrospective transmitfocusing and filter-derived coherence-index weighting

Chang Lin Hu*, Geng Shi Jeng, Yu Hsin Wang, Pai Chi Li, Meng Lin Li

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


Recently, a wide spectrum of new applications in biomedical ultrasound suchas real time 3D ultrasound and transient elastography has triggered the need ofhigh frame-rate imaging. One of the methods to achieve high frame-rate imagingis to use plane wave excitation (PWE) with which a single insonification issufficient to form an image. However, due to the lack of transmit focusing, thesignal-to-noise-ratio (SNR), contrast, and spatial resolution of the resultantimages are lower compared with a conventional focused transmission. To solvethis problem, we propose a filter-based retrospective focusing techniquecombined with filter-derived coherence-index weighting (FRFFCI weighting) forhigh frame-rate imaging with PWE. A 2-D filter is designed and applied tobeamformed baseband data to retrieve transmit focusing. Then a filter-derivedcoherence index (FCI) at each imaging point is used as a weighting factor tofurther improve the filter-retrieved focusing quality. Here FCI is a coherencemeasure of the filtered signal samples in the sliding filter kernel, Due to thesidelobe-suppression nature of the designed 2-D filter, FCIs are low atsidelobes; thus FCI weighting can further suppress the sidelobes in the filteredsignal samples. Simulation results demonstrated that our proposed FRFFCIweighting technique can enhance the image quality of high frame-rate imagingwith single PWE reducing the sidelobes, and improving the SNR and spatialresolution while being capable of retaining the high frame rate. Since it isapplied over high frame-rate imaging with single PWE, FRFFCI weighting performedafter beamforming is inherently insusceptible to motion artifacts. In addition,coded excitation techniques can be integrated into our technique to furtherimprove SNR.

Original languageEnglish
Title of host publication2010 IEEE International Ultrasonics Symposium, IUS 2010
Number of pages4
StatePublished - 2010
Event2010 IEEE International Ultrasonics Symposium, IUS 2010 - San Diego, CA, United States
Duration: 11 Oct 201014 Oct 2010

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117


Conference2010 IEEE International Ultrasonics Symposium, IUS 2010
Country/TerritoryUnited States
CitySan Diego, CA


  • coherence weighting
  • High frame rate imaging
  • plane wave excitation
  • retrospective focusing


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