A New Method for Reducing Metal Artifacts of Flat Workpiece in Cone-Beam CT
Metal artifacts of flat workpiece often exist in the horizontal direction in cone-beam Computed Tomography (CT) caused by beam-hardening, photon starvation, etc. In this paper, a novel method for reducing metal artifacts of flat workpiece is presented. In the proposed algorithm, firstly the 3-D image is reconstructed after normal scanning. Secondly, the flat workpiece which was rotated by ninety degrees is scanned again and the new 3-D reconstructed image is obtained. Thirdly, Scale- Invariant Feature Transform (SIFT) algorithmis adopted to match the slice image of the first reconstructed image with the slice image of the second one exactly. Finally, image fusion technique is applied to produce a fused image with less metal artifacts. The experiments have shown that the proposed method improves the reconstructed image quality greatly, and provides more detailed information compared to the current Metal Artifacts Reduction (MAR) algorithms.
KeywordsImage Fusion Metal Artifact Algebraic Reconstruction Technique Reduce Metal Artifact Image Fusion Technique
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