In Vivo High Frame Rate Vector Flow Imaging Using Plane Waves and Directional Beamforming

Jonas Jensen, Carlos Armando Villagómez Hoyos, Matthias Bo Stuart, Caroline Ewertsen, Michael Bachmann Nielsen, Jørgen Arendt Jensen

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Abstract

Directional beamforming (DB) estimates blood flowvelocities accurately when the flow angle is known. However, forautomatically finding the flow angle a computationally expensive approach is used. This work presents a method for estimating the flow angle using a combination of inexpensive transverse oscillation (TO) estimators and only 3 directional beamformed lines. The suggested DB vector flow estimator is employed with steered plane wave transmissions for high frame rate imaging.Two distinct plane wave sequences are used: a short sequence(3 angles) for fast flow and an interleaved long sequence (21angles) for both slow flow and B-mode. Parabolic flow with a peak velocity of 0.5 m/s is measured at beam-to-flow angles of60◦and 90◦. The DB method estimates the angle with a bias and standard deviation (STD) less than 2◦, and the STD of the velocity magnitude is 2.5 %. This is 7 - 8.5 % when using TO. The long sequence has a higher sensitivity, and when used forestimation of slow flow with a peak velocity of 0.04 m/s, the SDis 2.5 % and bias is 0.1 %. This is a factor of 4 better than ifthe short sequence is used. The carotid bifurcation was scanned on a healthy volunteer, and the short sequence was used with TO and DB to estimate velocity vectors. The STD of the velocity profile over a cardiac cycle was 6.1 % for TO and 4.9 % for DB.
Original languageEnglish
Title of host publicationProceedings of IEEE International Ultrasonics Symposium,
Number of pages4
PublisherIEEE
Publication date2016
ISBN (Print)978-1-4673-9897-8
DOIs
Publication statusPublished - 2016
Event2016 IEEE International Ultrasonics Symposium - Convention Center Vinci Tours, Tours, France
Duration: 18 Sep 201621 Sep 2016

Conference

Conference2016 IEEE International Ultrasonics Symposium
LocationConvention Center Vinci Tours
Country/TerritoryFrance
CityTours
Period18/09/201621/09/2016

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