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Myocardial ischemia and infarction alter myocardial viability and contractility. We have hypothesized that contractility changes can be detected by ultrasound strain imaging. Current ultrasound strain imaging methods are mainly 1D and 2D. However, heart motion is complex and 3D. Previous studies showed that 3D speckle tracking on a left ventricular (LV) phantom and a 3D LV simulation reduced low dimensional...
Modern medical imaging techniques enable the acquisition of in-vivo high resolution images of the vascular system. Most common methods for the detection of vessels in these images, such as multiscale Hessian-based operators and matched filters, rely on the assumption that, at each voxel there is a single cylinder. Such an assumption is clearly violated at the multitude of branching points that are...
A significant obstacle in the advancement of ultrasound computed tomography has been the lack of efficient and precise methods for the tracing of the bent rays that result from the interaction of sound with refractive media. In this paper, we propose the use of the fast marching method (FMM) to solve the eikonal equation which governs the propagation of sound waves. The FMM enables us to determine...
A fast and accurate segmentation method is needed for quantification of regional myocardial surface deformation and volume changes from cine-3D cardiac magnetic resonance (MR) images, to analyze multiple cardiac phases rapidly. A software package was designed in C++ using Open Inventor 3D Graphics Toolkit on the Silicon Graphics platform. We use a deformable contour based segmentation to extract...
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