Consistent estimation of cardiac motions by 4D image registration

Authors:
Dinggang Shen;Hari Sundar;Zhong Xue;Yong Fan;Harold Litt
Affiliations:
Section of Biomedical Image Analysis, Department of Radiology, University of Pennsylvania, Philadelphia, PA;Section of Biomedical Image Analysis, Department of Radiology, University of Pennsylvania, Philadelphia, PA;Section of Biomedical Image Analysis, Department of Radiology, University of Pennsylvania, Philadelphia, PA;Section of Biomedical Image Analysis, Department of Radiology, University of Pennsylvania, Philadelphia, PA;Section of Biomedical Image Analysis, Department of Radiology, University of Pennsylvania, Philadelphia, PA
Venue:
MICCAI'05 Proceedings of the 8th international conference on Medical image computing and computer-assisted intervention - Volume Part II
Year:
2005

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Abstract

A 4D image registration method is proposed for consistent estimation of cardiac motion from MR image sequences. Under this 4D registration framework, all 3D cardiac images taken at different time-points are registered simultaneously, and motion estimated is enforced to be spatiotemporally smooth, thereby overcoming potential limitations of some methods that typically estimate cardiac deformation sequentially from one frame to another, instead of treating the entire set of images as a 4D volume. To facilitate our image matching process, an attribute vector is designed for each point in the image to include intensity, boundary and geometric moment invariants (GMIs). Hierarchical registration of two image sequences is achieved by using the most distinctive points for initial registration of two sequences and gradually adding less-distinctive points for refinement of registration. Experimental results on real data demonstrate good performance of the proposed method in registering cardiac images and estimating motions from cardiac image sequences.