3 August 1984 Wiener Filtering For Deconvolution Of Geometric Artifacts In Limited-View Image Reconstruction
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Abstract
Computed Tomography (CT) images reconstructed using a limited number of projections, measured over a narrow angle range, are characterized by approximately elliptical distortion along the view angles used, and poor contrast at angles not used. This systematic geometric distortion is caused by the two dimensional point spread function of the reconstruction process. In this paper, we show that such geometric distortion and other artifacts introduced in the reconstruction process can be reduced substantially by deconvolution performed via Wiener filtering using a priori knowledge derived from the given projections. The two-dimensional system transfer function used in the deconvolution is obtained from the reconstruction of a test image by a linear reconstruction algorithm (unconstrained multiplicative Algebraic Reconstuction Technique).
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Atam P. Dhawan, Rangaraj M. Rangayyan, R. Gordon, "Wiener Filtering For Deconvolution Of Geometric Artifacts In Limited-View Image Reconstruction", Proc. SPIE 0515, Medical Images and Icons, (3 August 1984); doi: 10.1117/12.964749; https://doi.org/10.1117/12.964749
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