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KMID : 0357520140370040323
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Journal of Radiological Science and Technology
2014 Volume.37 No. 4 p.323 ~ p.330
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Oh Oh-Sung
Lee Seung-Wook
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Abstract
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Image reconstruction is one of the most important processes in CT (Computed tomography) technology. For fast scanning and low dose to the objects, iterative reconstruction is becoming more and more important. In the implementation of iterative reconstruction, projection and backprojection processes are considered to be indispensable parts. However, many approaches for projection and backprojection may result severe image artifacts due to their discrete characteristics and affects the reconstructed image quality. Thus, new approaches for projection and backprojection are highly demanded these days. In this paper, distance-driven approach was evaluated and compared with other conventional methods. The numerical simulator was developed to make the phantoms, and projection and backprojection images were compared using these approaches. As a result, it turned out that there are less artifacts during projection and backprojection in parallel and fan beam geometry.
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KEYWORD
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System matrix, Projection, Backprojection, Reconstruction, Computed tomography
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