Abstract
The quantitative evaluation of ultrasonic displacement in tissue under externally applied forces is a necessary step in the field of ultrasonic diagnostics. In this study, the speckle tracking method is used to investigate motion artifact produced by a rotating tissue. An analytic prediction of this motion artifact in relation to system characteristics (i.e., beam width, pulse duration, frequency and phase of the signal) is presented. The tissue is modeled as a random array of numerous point scatterers, and RF signals are computed based on the convolutions between the transmission pulse and the impulse response of each scanning line. The preliminary results show that the artifact resulting from the speckle tracking method depends on the beam width. The method is quite general and can be extended to study the effects of other tissue motion, in particular, the deformation of tissue.
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