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- Augustin, XeniaSwiss Fed Inst Technol, Comp Assisted Applicat Med, Zurich, Switzerland. (author)
Estimating Mean Speed-of-Sound from Sequence-Dependent Geometric Disparities
- Article/chapterEnglish2021
Publisher, publication year, extent ...
- Institute of Electrical and Electronics Engineers (IEEE),2021
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Numbers
- LIBRIS-ID:oai:DiVA.org:uu-482388
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-482388URI
- https://doi.org/10.1109/IUS52206.2021.9593742DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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- In ultrasound beamforming, focusing time delays are typically computed with a spatially constant speed-of-sound (SoS) assumption. A mismatch between beamforming and true medium SoS then leads to aberration artifacts. Other imaging techniques such as spatially-resolved SoS reconstruction using tomographic techniques also rely on a good SoS estimate for initial beamforming. In this work, we exploit spatially-varying geometric disparities in the transmit and receive paths of multiple sequences for estimating a mean medium SoS. We use images from diverging waves beamformed with an assumed SoS, and propose a model fitting method for estimating the SoS offset. We demonstrate the effectiveness of our proposed method for tomographic SoS reconstruction. With corrected beamforming SoS, the reconstruction accuracy on simulated data was improved by 63% and 29%, respectively, for an initial SoS over- and under-estimation of 1.5%. We further demonstrate our proposed method on a breast phantom, indicating substantial improvement in contrast-to-noise ratio for local SoS mapping.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Signalbehandling hsv//swe
- ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Signal Processing hsv//eng
- Beamforming
- speed-of-sound imaging
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- Zhang, LinSwiss Fed Inst Technol, Comp Assisted Applicat Med, Zurich, Switzerland. (author)
- Göksel, OrcunUppsala universitet,Avdelningen för visuell information och interaktion,Swiss Fed Inst Technol, Comp Assisted Applicat Med, Zurich, Switzerland.(Swepub:uu)orcgo786 (author)
- Swiss Fed Inst Technol, Comp Assisted Applicat Med, Zurich, Switzerland.Avdelningen för visuell information och interaktion (creator_code:org_t)
Related titles
- In:INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS 2021): Institute of Electrical and Electronics Engineers (IEEE)9780738112091
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