P4B-2 Beamforming Techniques for Motion Estimation in Ultrasound Elastography

In this paper, we will discuss about the interest and performance of synthetic aperture with transverse oscillations beamforming technique from the displacement estimation point of view. After the experimental validation of the combination of transmit and receive beamforming for transverse oscillations methods using synthetic aperture imaging performances in terms of displacement field accuracy are evaluated experimentally. Motion is estimated using a specific motion estimation method based on phase plane fittingThe quality of the estimation is evaluated by block wise correlation between the pre-deformation image and the registered post-deformation image. Results show that transmit and receive beamforming allow to increase by nearly a factor of 2 the transverse oscillations frequency increasing as well the transverse resolution by a factor of radic2 compared to receive beamforming only. This leads naturally to an increase in estimated displacement field accuracy.