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Using opposite rays to detect organ motion in CT images

Motion artifacts have been identified as a problem in medical tomography systems. This paper describes an approach that isolates the motion in CT images. Using a fan-beam projection system with one source and equiangular rays, the algorithm combines information from projections that are opposite in space and separated in time to isolate and identify motion. The algorithm was evaluated using the Shepp-Logan (1974) phantom in which one of the interior elements was made to move in a physiologically relevant manner. A sinogram of differences was created and from this an image of the moving phantom element was reconstructed using a standard filtered backprojection reconstruction algorithm. A standard hardware configuration was simulated. The motion was isolated in the sinogram domain and an image of the moving phantom element was reconstructed with little error.