Dense Nonrigid Motion Tracking from a Sequence of Velocity Fields

We have addressed the problem of tracking the non-rigid motion of the heart using a sequence of velocity elds and a sequence of contours. The information from both the contours and the dense velocity elds is integrated into a deforming mesh that is placed over the myocardium at one time frame and then tracked over the entire cardiac cycle. The deformation is guided by a smoothing lter that provides a compromise between (i) believing the dense eld velocity and the contour data when it is crisp and coherent in a local spatial and temporal sense and (ii) employing a temporally smooth cyclic model of cardiac motion when contour and velocity data are not trustworthy. The method has been carefully evaluated with simulated data and phantom data. Experiments with in vivo data have also been conducted.