Improved Dynamic Cardiac Phantom Based on 4D NURBS and Tagged MRI
نویسندگان
چکیده
منابع مشابه
In-Vivo Validation of 4D B-Spline-based Motion Tracking Algorithm for Cardiac Tagged MRI
Introduction In cardiac MRI, tags move with the contracting heart, and their distortion in subsequent images provides useful qualitative and quantitative information about functional properties of underlying myocardium [1]. We have previously reported a method to derive the heart motion from one dimensional tag displacement information [2]. In this method, a final four-dimensional tensor produc...
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Non Uniform Rational B-splines (NURBs) are proved to be very promising for metamodeling in engineering problems, because they have unique properties such as local modification scheme, strong convex hull property, and infinitely differentiability, etc. Since NURBs are defined by control points, knot vector, and weights associated with control points, the precision of NURBs is influenced by all o...
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In this paper we introduce a tag separation method for better cardiac boundary segmentation and tag tracking. Our approach is based on two observations in the cardiac tagged MR images: 1) the tag patterns have a regular texture; 2) the cardiac images without tag patterns are piecewise smooth with sparse gradients. These observations motivate us to use two dictionaries, one based on the Discrete...
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ژورنال
عنوان ژورنال: IEEE Transactions on Nuclear Science
سال: 2009
ISSN: 0018-9499
DOI: 10.1109/tns.2009.2016196