Estimación del Movimiento Cardiaco en Imágenes de Resonancia Magnética usando Flujo Óptico (Cardiac Motion Estimation in Magnetic Resonance Images Using Optical Flow)

Ruben Medina (ruben.medina@ucuenca.edu.ec)2, Emiro Ibarra (emiroji@gmail.com)1, Villie Morocho (villie.morocho@ucuenca.edu.ec)2, Pablo Vanegas (pablo.vanegas@ucuenca.edu.ec)2


1Universidad de Los andes
2Universidad de Cuenca

This paper appears in: Revista IEEE América Latina

Publication Date: June 2016
Volume: 14,   Issue: 6 
ISSN: 1548-0992


Abstract:
This paper reports an optical based method for quantification of cardiac motion in MRI images. The cardiac motion is quantified in a Short-Axis (SAX) slice located at the mid-cavity of the left ventricle. In this slice, the left ventricle wall is segmented for extracting the endocardium, the epicardium and the mid‑wall. The velocity field for these contours is available after performing the optical flow estimation for the given slice. Post-processing of this motion field enables estimation of the radial displacement. The core of this cardiac motion quantification method is a sparse based algorithm for optical flow estimation. This algorithm is presented and compared with several classical optical flow estimation algorithms. The comparison is performed using several video sequences available from the Middlebury benchmark where the ground truth optical flow is known. The algorithms with better performance are also tested using a 4‑ D cardiac Magnetic Resonance Image (MRI) sequence. Results show that he sparse algorithm estimates an optical flow field that represents the motion of contraction during the systole interval. Moreover, results about radial displacement estimation on real MRI sequences for a normal subject and a patient with hypertrophy show that the proposed quantification method could be useful for quantification of left ventricle motion.

Index Terms:
Optical flow, Cardiac motion, Medical Imaging, Sparse methods, Left ventricle, Magnetic Resonance Imaging   


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