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Ultrasonic elastography is an imaging technique providing information about the relative stiffness of biological tissues. In general, elastography suffers from noise artifacts, which degrade lesion detectability and increase the likelihood of misdiagnosis. This paper proposes a method called transmit- side frequency compounding for elastography (TSFC). Beamforming is modified to transmit frames with...
Abstract-Elastography is a non-invasive method in which stiffness of soft tissue is displayed as strain images to assist in detecting or classifying tumors. External tissue compression causes axial displacements which are subsequently computed and converted to strain. However, in this processing, periodic artifacts often corrupt the image quality severely. This paper presents a 2-D FFT removal algorithm...
The axial- and the lateral- guidance motion tracking are efficient approaches for real-time strain imaging; however, they are suffering from error propagation. This paper introduces a novel multi-direction guidance (MDG) motion tracking algorithm which selects higher quality previous estimations from multi-directions as seed displacement of the next estimated location. Experiment results show that...
Ultrasound elastography is the technique of obtaining the tissue relative stiffness information, which plays an important role in early diagnosis. Conventional elastography computes the strain from the gradient of the displacement estimates between gated pre- and post-compression echo signals. Although elastography has been proven to be a potential diagnosis tool for breast/prostate tumor, vascular...
We first designed two chirp-coded excitation/ compression schemes which were applied to ultrasound elasticity imaging in simulation method using Field II. The simulation results demonstrate that in low echo-signal-to-noise ratio (eSNR) conditions, the performance of chirp-coded pulse for elasticity imaging is much better than the conventional short pulse, and indicate that elastographic signal-to-noise...
In ultrasound strain imaging, random fluctuations of the signal amplitude result in a match only occurred at certain regions from pre- and post-compression window pairs. This produces amplitude modulation (AM) strain noise. In this paper a new suppressing amplitude modulation method called displacement filed correction (DFC) is presented. Both simulation and phantom experiment demonstrate that the...
Ultrasound elastography has been well applied in medical detection as a tool to aid diagnosis. However, in conventional ultrasound elastograms, there are patterned artifacts from non-white estimation errors. In this paper, we investigate spatial angular compounding methods to reduce the errors. The method involves averaging ultrasound angular elastograms around the same region-of-interest but from...
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