Assessment of Left Ventricular Function in Cardiac MSCT Imaging by a 4D Hierarchical Surface-Volume Matching Process

摘要

Multislice computed tomography (MSCT) scanners offer newperspectives for cardiac kinetics evaluation with 4D dynamicsequences of high contrast and spatiotemporal resolutions. A newmethod is proposed for cardiac motion extraction in multislice CT.Based on a 4D hierarchical surface-volume matching process, itprovides the detection of the heart left cavities along theacquired sequence and the estimation of their 3D surface velocityfields. A Markov random field model is defined to find, accordingto topological descriptors, the best correspondences between a 3Dmesh describing the left endocardium at one time and the 3Dacquired volume at the following time. The global optimization ofthe correspondences is realized with a multiresolution process.Results obtained on simulated and real data show the capabilitiesto extract clinically relevant global and local motion parametersand highlight new perspectives in cardiac computed tomographyimaging.