Effect of element directivity on adaptive beamforming applied to high-frame-rate ultrasound

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Hideyuki Hasegawa, Hiroshi Kanai

Abstract

High-frame-rate ultrasound is a promising technique for measurement and imaging of cardiovascular dynamics. In high-frame-rate ultrasonic imaging, unfocused ultrasonic beams are used in transmit and multiple focused receiving beams are created by parallel beamforming using the delay and sum (DAS) method. However, the spatial resolution and contrast are degraded compared with conventional beamforming using focused transmit beams. In the present study, the minimum variance beamformer was examined for improvement of the spatial resolution in high-frame-rate ultrasound. In conventional minimum variance beamforming, the spatial covariance matrix of ultrasonic echo signals received by individual transducer elements is obtained without considering the directivity of the transducer element. By omitting the element directivity, the error in estimation of the desired signal (i.e., the echo from the focal point) increases, and as a result, the improvement of the spatial resolution is degraded. In the present study, the element directivity was taken into account in estimation of the spatial covariance matrix used in minimum variance beamforming. The effect of the element directivity on adaptive beamforming was evaluated by computer simulat...Continue Reading

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Citations

Nov 13, 2015·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Hideyuki Hasegawa, Hiroshi Kanai
Jul 23, 2016·Journal of Medical Ultrasonics·Hideyuki Hasegawa
Jan 14, 2017·Journal of Medical Ultrasonics·Hideyuki Hasegawa

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