A new motion estimation and compensation method for cardiac computed tomography (CT) was developed. By
combining two motion estimation (ME) approaches the proposed method estimates the local and global cardiac motion
and then preforms motion compensated reconstruction. The combined motion estimation method has two parts: one is
the local motion estimation, which estimates the coronary artery motion by using coronary artery tree tracking and
registration; the other one is the global motion estimation, which estimates the entire cardiac motion estimation by image
registration. The final cardiac motion is the linear combination of the coronary artery motion and entire cardiac motion
the. We use the backproject-then-warp method proposed by Pack et al. to perform motion compensation reconstruction
(MCR). The proposed method was evaluated with 5 patient data and improvements in sharpness of both coronary
arteries and heart chamber boundaries were obtained.
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