Tracking the Left Ventricular Motion by Harmonic State Model

We developed a new method of tracking closed contour which is based on a harmonic state model (HSM), in order to carry out the tracking of the left ventricle (LV) during all the cardiac cycle. This method provides us the trajectories of the LV contour, and information necessary to the analysis of the cardiac motion. The state vector generated by the HSM, who is local descriptor of LV, allows a robust and correct modeling of closed contour. The tracking of motion is carried out by a search for similar state vectors during all the cardiac cycle. The application in simulation of our method gives satisfactory results. On the real data extracted from MRI sequences, the calculated trajectories, points of the LV contour throughout the cardiac cycle, allow us to have a clearly visible difference between a healthy heart and a pathological heart.