A Method to Correct Organ Motion Artifacts in X-Ray CT Systems Based on Tracking of Motion Phase by the Spatial Overlap Correlator


  1. Dhanantwari, A.C.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Dhanantwar (Amar C), Toronto ONT (CAN)
This report describes a novel method to track organ motion and eliminate motion artifacts in x-ray Computed Tomography (CT) cardiac imaging applications with emphasis on the detection of cardiac blood vessel calcification. The method consists of a spatial overlap correlator scheme to track organ motion in x-ray CT systems. A coherent sinogram synthesis (CSS) method is then used to correct for ogan-motion artifacts. Since the spatial overlap correlator scheme tracks the cardiac motion, it identifies also the projection points associated with minimum amplitude cardiac motion effects. These points are used to identify a 180 degrees plus the fan angle sinogram for image reconstruction. This leads to a retrospective gating (RG) scheme that is based on the output results of the spatial overlap correlator. Performance comparison of the proposed methodology with the retrospective ECG-gating using real data sets with phantoms and human patients provides a performance assessment of the merits of the proposed methods. Real results demonstrate that the new methodology eliminates the requirement for ECG, the CSS method does not require breath-holding and that it is possible to be implemented in x-ray CT scanners to detect cardiac blood vessel calcification and image the heart's ventricles.
Medical Tomography Imaging;Adaptive Noise Cancellation;Spatial Overlap Correlator;Organ Motion Artifacts;Image Reconstruction Algorithms;X-Ray Scanners
Report Number
DCIEM-CR-2000-054 — Contractor Report (Final)
Date of publication
01 May 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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