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Shear wave propagation speed has been regarded as an attractive indicator for quantitatively measuring the intrinsic mechanical properties of soft tissues. While most existing techniques use acoustic radiation force (ARF) excitation with focal spot region based on linear array transducers, we try to employ a special ARF with a focal line region and apply it to viscoelastic materials to create shear...
Model-based reconstruction algorithms have shown potentials over conventional strain-based methods in static elas-tographic image by using ”accurate” finite element(FE) or bio-mechanical models. Strictly speaking, however, the measurement noise are always exists and thus do not meet basic assumptions of these algorithms. In addition, the difficulty in determining the proper system response model also...
A strain-based elastography is developed to identify lesions from the phase information of ultrasonic radio frequency (RF) signals in this study: a phase shift method using prior estimates is first applied to recover the axial displacement from RF signals, followed by a meshfree method to compute a smooth strain field from estimated displacement. The numerical complexity of our phase shift method...
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