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Two-dimensional (2-D) myocardial elastography is a radio-frequency (RF)-based speckle tracking technique that uses one-dimensional (1-D) cross-correlation and recorrelation methods in a 2-D search, and can estimate and image the 2-D transmural motion and deformation of the myocardium so as to characterize the cardiac function. Based on a three-dimensional (3-D) finite-element (FE) canine left-ventricular...
Using a retrospective ECG-gating technique, an extremely high frame rate (up to 8 kHz) was previously shown achievable for full-view (12times12 mm2) myocardial elastography in murine left ventricles. The purpose in this paper was to isolate the left ventricle from other structures for better displacement and strain visualization. In-vivo experiments were performed in anesthetized normal and infarcted...
The heart is a mechanical pump that is electrically driven. We have previously shown that the contractility of the cardiac muscle can reliably be used in order to assess the extent of ischemia. In this paper, in vivo imaging (35 MHz) was performed on anesthetized mice before and after left anterior descending (LAD) coronary artery ligation at high frame rates (Vevo 770, Visualsonics, Inc.) in order...
Myocardial elastography is a novel method for noninvasively assessing regional myocardial function, with the advantages of high spatial/temporal resolution, high signal-to-noise ratio and angle-independence. In this paper, in vivo experiments were performed in anesthetized normal and infarcted mice using a high-resolution ultrasound system. Radio-frequency signals were acquired at a high frame rate...
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