Definition of a four-dimensional continuous planispheric transformation for the tracking and the analysis of left-ventricle motion.
Cardiologists assume that analysis of the motion of the heart (especially the left ventricle) can provide useful information about the health of the myocardium. A 4-D polar transformation is defined to describe the left-ventricle (LV) motion and a method is presented to estimate it from sequences of 3-D images. The transformation is defined in 3-D planispheric coordinates (3PC) by a small number of parameters involved in a set of simple linear equations. It is continuous and regular in time and space, and periodicity in time can be imposed. The local motion can be easily decomposed into a few canonical motions (radial motion, rotation around the long-axis, elevation). To recover the motion from original data, the 4-D polar transformation is calculated using an adaptation of the iterative closest-point algorithm. We present the mathematical framework and a demonstration of its feasability on a series of gated SPECT sequences.
Declerck
J
J
INRIA, Projet EPIDAURE, Sophia-Antipolis, France. jdecler@sophia.inria.fr
Feldmar
J
J
Ayache
N
N
D006801:Humans; D007091:Image Processing, Computer-Assisted; D008955:Models, Cardiovascular; D008962:Models, Theoretical; D009038:Motion; D009200:Myocardial Contraction; D015899:Tomography, Emission-Computed, Single-Photon; D016277:Ventricular Function, Left