Transverse flow imaging using synthetic aperture directional beamforming

Jørgen Arendt Jensen, Svetoslav Nikolov

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

Current ultrasound scanners only determine the velocity along the ultrasound beam, since data is only focused along the emitted beam. Synthetic aperture ultrasound systems have the capability of focusing simultaneously in all directions. This is used here to focus along the flow direction and then cross-correlate these measurements to obtain the correct velocity magnitude. The approach was investigated in a flow system with a laminar flow. ne flow profile was measured with a B-K Medical 8804 7.5 MHz linear array transducer. A plastic tube with an entrance length of 1 m and a diameter of 17 nm was used with an EcoWatt 1 pump generating a laminar, stationary flow. The velocity profile was measured for flow angles of 90 and 60 degrees. The RASMUS research scanner was used for acquiring RF data from 128 elements of the array using 8 emissions with 11 elements in each emission. A 20μs chirp was used during emission. The RF data were subsequently beamformed off-line and stationary echo canceling was performed. The 60 degrees flow was determined using 16 groups of 8 emissions and the relative standard deviation was 0.36 % (0.65 mm/s). Using the same setup for the purely transverse flow gave a std. of 1.2 % (2.1 mm/s). An in-vivo image of the carotid artery and jugular vein of a healthy 29 years old volunteer. A full color flow image using only 128 emissions could be made with a high velocity precision.
Original languageEnglish
Title of host publication2002 IEEE Ultrasonics Symposium Proceedings
PublisherIEEE
Publication date2002
Pages1488-1492
ISBN (Print)0-7803-7582-3
DOIs
Publication statusPublished - 2002
Event2002 IEEE Ultrasonics Symposium - Munich, Germany
Duration: 8 Oct 200211 Oct 2002
http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8480

Conference

Conference2002 IEEE Ultrasonics Symposium
Country/TerritoryGermany
CityMunich
Period08/10/200211/10/2002
Internet address

Bibliographical note

Copyright: 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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