de Korte, Chris L.

Hansen, Hendrik H.G.

Jensen, Jørgen Arendt

Stuart, Matthias Bo

Villagómez Hoyos, Carlos Armando

Hendrik H.G. Hansen

Matthias B. Stuart

Carlos A. Villagomez Hoyos

Jorgen Arendt Jensen

Chris L. de Korte

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Performance evaluation of compounding and directional beamforming techniques for carotid strain imaging using plane wave transmissions

Carotid strain imaging in 3D is not possible with conventional focused imaging, because the frame rate is too low. Plane wave ultrasound provides sufficiently high frame rates, albeit at t he cost of image quality, especially in the off - axis direction due to the lack of focusing . Multiple techniques have been developed to cope with the low off - axis image quality when performing 2D (and in future 3D) motion estimation: cross correlation with directional beamforming (with or without RF (coherent) compounding) and displacement compounding. This study compares the precision of these techniques using linear array ultrasound data of a pulsating concentric homogeneous artery simulated using Field II . The transducer ( f c = 9 MHz, pitch = 197.9 μ m, 192 elements, f s = 180 MHz) transmitted plane waves at 3 sequentially alternating angles (0°, + θ , - θ ) at a PRF of 2 kHz. Simulations were repeated for θ ranging from 1° to 20° with increments of 1° . D isplacements were estimated for frame intervals of 1/15th s, tracked, and cumulated from diastole to systole using either displacement com pounding, or directional beamforming optionally enhanced b y RF compounding. 1D directional beamforming with RF compounding and 2D displacement compounding with θ = ~20 ° per formed equally and best with a relative root - mean - squared error of ~2% with respect to the analytical solution . The mean and standard deviation of the estimated motion direction for 2D displacement compounding with θ = 20 ° was 0 . 03 ° +/ - 1.43 °. Since displacement compounding requires no assumptions reg arding the motion direction, this tech nique seems the best option for plane wave carotid strain imaging

Online Research Database In Technology

http://orbit.dtu.dk/ws/files/99453899/2014_IEEEProceedings_Final.pdf

Performance evaluation of compounding and directional beamforming techniques for carotid strain imaging using plane wave transmissions

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Online Research Database In Technology