Mr. Guy A. Lavi Profile

Guy A. Lavi

Algorithms Developer at Philips Medical Systems Technologies Ltd

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Proceedings Article | 12 May 2004 Paper

Fast automatic delineation of cardiac volume of interest in MSCT images

Cristian Lorenz, Jonathan Lessick, Guy Lavi, Thomas Bulow, Steffen Renisch

Proceedings Volume 5370, (2004) https://doi.org/10.1117/12.533463

KEYWORDS: Tissues, Heart, Chest, Arteries, Image processing, Bone, Computed tomography, Lung, Visualization, Volume rendering

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Computed Tomography Angiography (CTA) is an emerging modality for assessing cardiac anatomy. The delineation of the cardiac volume of interest (VOI) is a pre-processing step for subsequent visualization or image processing. It serves the suppression of anatomic structures being not in the primary focus of the cardiac application, such as sternum, ribs, spinal column, descending aorta and pulmonary vasculature. These structures obliterate standard visualizations such as direct volume renderings or maximum intensity projections. In addition, outcome and performance of post-processing steps such as ventricle suppression, coronary artery segmentation or the detection of short and long axes of the heart can be improved. The structures being part of the cardiac VOI (coronary arteries and veins, myocardium, ventricles and atria) differ tremendously in appearance. In addition, there is no clear image feature associated with the contour (or better cut-surface) distinguishing between cardiac VOI and surrounding tissue making the automatic delineation of the cardiac VOI a difficult task. The presented approach locates in a first step chest wall and descending aorta in all image slices giving a rough estimate of the location of the heart. In a second step, a Fourier based active contour approach delineates slice-wise the border of the cardiac VOI. The algorithm has been evaluated on 41 multi-slice CT data-sets including cases with coronary stents and venous and arterial bypasses. The typical processing time amounts to 5-10s on a 1GHz P3 PC.

Proceedings Article | 5 May 2004 Paper

Mapping the coronary arteries on a sphere in CT angiography

Guy Lavi

Proceedings Volume 5367, (2004) https://doi.org/10.1117/12.534571

KEYWORDS: Visualization, Arteries, Optical spheres, Angiography, Spherical lenses, Heart, Computed tomography, Inspection, Scanners, Natural surfaces

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Current approaches for coronary artery inspection using cardiac CT angiography scans include curved planar reformation (CPR), slab maximum-intensity projection (MIP) and volume rendering (VR) techniques. While the first two allow a detailed examination of only one vessel or a few segments of the coronary artery tree at a time, the VR techniques are not considered suitable for a thorough clinical assessment. An innovative concept of visualization aimed at revealing the entire coronary tree in a CPR-type environment is presented. The new approach uses a sphere or an ellipsoid as a base surface to map the coronary tree. Using the spherical (or ellipsoidal) coordinate system a “true” surface running through the centerlines of all the vessels is defined. Resampling the volume data with this (preferably thick) surface and using a maximum-intensity projection will produce three possible modes of visualization. In one mode the “true form” surface is texture-mapped with the resampled volume data, while in another the data is projected onto the sphere that served as a base surface, forming the “Globe” mode of visualization. Peeling the data to form a 2D “map” of the entire coronary tree in its context in the heart constitutes the third mode.

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