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Acoustic radiation force impulse (ARFI) imaging generates localized small displacements (typically less than 20 microns) in soft tissues and would induce shear waves. The shear wave speed (SWS), which is determined by the tissue elastic properties and can offer quantitative tissue stiffness, can be monitored from the displacement field. Therefore, precise tracking of small displacements is of great...
Important soft tissue parameters such as elasticity can be obtained by ultrasonic elastic imaging. Nonetheless, the radio frequency (RF) data received by ultrasonic transducer are always mixed up with noises. In this paper, we develop a new adaptive signal processing method for ultrasonic elastography. The key part of the method is the empirical mode decomposition (EMD) which a method associated with...
Elastography is an emerging ultrasonic imaging technique. A system based on transient elastography is built to measure biological tissues' stiffness in the paper. Then, wavelet de-noising of the displacement estimatation to reduce artifacts due to high overlap in transient elastography is presented. High overlap between data segments is essential to improve axial resolution in transient elastography...
A novel imaging processing method using gray level co-occurrence matrix (GLCM) to evaluate microbubble concentration in ultrasonic particle image velocimetry (echo PIV) technique is presented in this paper. The image processing method is used to study the optimum microbubble concentration in Echo PIV imaging of a two dimensional blood flow field. It is found that for the GLCM correlation values for...
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