Velocity estimation using recursive ultrasound imaging and spatially encoded signals

Svetoslav Nikolov, Kim Gammelmark, Jørgen Arendt Jensen

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Previously we have presented a recursive beamforming algorithm for synthetic transmit aperture focusing. At every emission a beamformed low-resolution image is added to an existing high-resolution one, and the low-resolution image from the previous emission with the current active element is subtracted yielding a new frame at every pulse emission. In this paper the method is extended to blood velocity estimation, where a new color flow mapping (CFM) image is created after every pulse emission. The underlying assumption is that the velocity is constant between two pulse emissions and the current estimates can therefore be used for compensation of the motion artifacts in the data acquired in the next emission. Two different transmit strategies are investigated in this paper: (a) using a single defocused active aperture in transmit, and (b) emitting with all active transmit sub-apertures at the same time using orthogonal spatial encoding signals. The method was applied on data recorded by an experimental system. The estimates of the blood velocity for both methods had a bias less than 3% and a standard deviation around 2% making them a feasible approach for blood velocity estimations
Original languageEnglish
Title of host publicationUltrasonics Symposium, 2000 IEEE
Publication date2000
ISBN (Print)0-7803-6365-5
Publication statusPublished - 2000
Event2000 IEEE Ultrasonics Symposium - San Juan, Puerto Rico
Duration: 22 Oct 200025 Oct 2000


Conference2000 IEEE Ultrasonics Symposium
CountryPuerto Rico
CitySan Juan
Internet address

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Nikolov, S., Gammelmark, K., & Jensen, J. A. (2000). Velocity estimation using recursive ultrasound imaging and spatially encoded signals. In Ultrasonics Symposium, 2000 IEEE (pp. 1473-1477). IEEE.