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Ultrasound strain imaging has been proposed to quantitatively assess myocardial contractility. Cross-correlation based 2D speckle tracking (ST) and auto-correlation based Doppler tissue imaging (DTI) are competitive ultrasound techniques for this application. Unlike ST, DTI is limited by angle dependency and suffers from low signal-to-noise ratio because a high pulse repetition frequency (PRF) is...
Large interframe strain in speckle tracking based myocardial strain imaging causes significant peak hopping artifacts. In this paper, an algorithm combining Viterbi search with an improved correlation coefficient filter is proposed to reduce peak hopping artifacts. A 2-D simulation with average 8% compression and in-vivo data from a rabbit experiment were performed to validate the proposed algorithm...
Internal strain resulting from tissue deformation can be estimated by correlation of speckle patterns within radio frequency (RF) ultrasound images. For large deformations, random correlations between speckle kernels may exceed the true peak. In this study, we use the Viterbi algorithm to overcome peak hopping artifacts. RF data were generated for an average strain of 5%. Simulations were performed...
Very large, two-dimensional, conformal arrays have been proposed to improve ultrasound's ability to detect cancer. These arrays are undersampled in elevation to reduce total channel number while maintaining full three-dimensional focusing capability. Due to limited acoustic windows into the body, however, a fraction of the aperture might be blocked and produce undesired imaging artifacts. In addition,...
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