Cardiac Motion Estimation in Gated Emission Computer Tomography Imagery
Jing Tang, W. Paul Segars, Benjamin M. W. Tsui
METHODS AND MATERIALS:
The overall estimation problem is to find a motion
field consistent with elastic properties of the cardiac tissue that best
matches the heart voxels in one frame to those in the other frame. The motion
estimation is implemented through searching for the vector field that
minimizes the cost function made of an image matching error term and a strain
energy term serving as the regularization constraint. Minimizing the overall
cost function is achieved by using a
Two slices of frame 1 from an 8-gate cardiac phantom are shown here with the estimated and true motion fields superimposed. As seen in the figures, the motion estimation algorithm functions reasonably well in catching the radial component of the cardiac motion but has difficulties in resolving the tangential component.
More work needs to be done in tracking the cardiac twisting motion. Possible directions to go would include adding prior or using initialization with the twist involved and adding features in the cardiac wall so that twist motion is easier for the algorithm detect.
Corrective Image Reconstruction Methods For ECT, NIBIB
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