Patent ID: 8849005
Filing Date: 2014-09-30
Classification: G06K,G06T

Abstract:
1. A method of tracking coronary artery motion in a sequence of 2D images, comprising the steps of: constructing a centerline model of a segmented vascular structure in a base phase image in a sequence of 2D images of coronary arteries acquired over one or more cardiac phases; computing, for each pixel in a region-of-interest (ROI) in each subsequent image in the sequence of 2D images, a velocity vector that represent a change in position between the subsequent image and base phase image in the sequence of 2D images; calculating positions of control points i in each phase p using the velocity vectors applying PCA to a P×2N data matrix X where m p is a mean value of 2N control points positions (x, y) at phase p of the cardiac cycle, v i is an eigenvector of U=cov(XX T ), and the α p,i 's are determined for each phase p, wherein a centerline model for a new image at phase p+1 is estimated by adding {circumflex over (α)} p to each centerline control point of a previous frame at phase p.