Speckle Tracking Performance in High Frame-Rate Ultrasound Imaging
Date Issued
2009
Date
2009
Author(s)
Wu, Shih-Ying
Abstract
High frame-rate imaging has the potential to improve performance of speckle tracking. Compared with Doppler techniques, with which the maximum detectable velocity is limited and it is flow angle dependent, speckle tracking does not suffer from these limitations. With high frame rate region, it is possible that the computational complexity can be reduced and the estimation accuracy can be improved, both due to the fact that the motion between two high frame-rate images is relatively smaller. It is therefore the purpose of this study to test this hypothesis and to evaluate performance of high frame-rate speckle tracking.ain factors affecting performance of high frame-rate speckle tracking include image signal-to-noise ratio (SNR), velocity and velocity gradient. Two sets of experiments and one set of simulations (bulk motion and motion with gradient) are conducted to evaluate the influences of the factors mentioned above. Speckle tracking using the sum-absolute-difference algorithm was adopted in this study. Plane-wave excitation was adopted to achieve high frame-rate imaging.he results for this method show that high accuracy can be achieved under sufficiently high SNRs. In addition, computational complexity of speckle tracking is reduced when frame rate is increased. Efficient and accurate high frame-rate speckle tracking is thus feasible.
Subjects
Speckle tracking
Angle-independent motion estimation
Motion tracking
High frame-rate ultrasound imaging
Type
thesis
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