Free-form deformations with lattices of arbitrary topology
SIGGRAPH '96 Proceedings of the 23rd annual conference on Computer graphics and interactive techniques
Cardiac Motion Simulator for Tagged MRI
MMBIA '96 Proceedings of the 1996 Workshop on Mathematical Methods in Biomedical Image Analysis (MMBIA '96)
FIMH'03 Proceedings of the 2nd international conference on Functional imaging and modeling of the heart
Coronary Motion Modelling for Augmented Reality Guidance of Endoscopic Coronary Artery Bypass
ISBMS '08 Proceedings of the 4th international symposium on Biomedical Simulation
Image Guidance for Robotic Minimally Invasive Coronary Artery Bypass
MIAR '08 Proceedings of the 4th international workshop on Medical Imaging and Augmented Reality
Real time myocardial strain analysis of tagged MR cines using element space non-rigid registration
ACCV'10 Proceedings of the 10th Asian conference on Computer vision - Volume Part IV
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In this paper we present a new methodology for cardiac motion tracking in tagged MRI using nonrigid image registration based on subdivision surfaces and subdivision lattices. We use two sets of registrations to do the motion tracking. First, a set of surface registrations is used to create and initially align the subdivision model of the left ventricle with short-axis and long-axis MR images. Second, a series of volumetric registrations are used to perform the motion tracking and to reconstruct the 4D cardiac motion field from the tagged MR images. The motion of a point in the myocardium over time is calculated by registering the images taken during systole to the set of reference images taken at end-diastole. Registration is achieved by optimizing the positions of the vertices in the base lattice so that the mutual information of the images being registered is maximized. The presented method is validated using a cardiac motion simulator and we also present strain measurements obtained from a group of normal volunteers.