Abstract
In some x-ray CT situations, the x-ray data of the object are available only in a limited angular range. Limited-angle imaging occurs, for example, when scanning in an angular range is obstructed by other physical objects, or when the x-ray is attenuated too much in a particular angular range to serve any useful purpose. These situations are illustrated in Fig. 1. Under such circumstances limited-angle image reconstruction techniques could be employed to reconstruct the object from the x-ray data and other information about the object, such as (1) exterior boundary of the object; (2) upper bound of the object density; (3) lower bound of the object density. It has been shown that by using this information in addition to the limited-angle x-ray data, the object can be reconstructed uniquely [1]. The limited-angle reconstruction algorithm developed in the above reference is shown in Fig. 2; the image is transformed back and forth between the object space by filtered backprojection, and the projection space by projection, with corrections by the a priori information in the object space and the limited-angle known projections in the projection space.
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References
K.C. Tam and V. Perez-Mendez, “Principles of Tomographical Imaging with Limited Angle Input,” J. Opt. Soc. Am 71, 582(1984).
K.C. Tam, “The Construction and The Use of Convex Hulls in Limited-Angle Computerized Tomography,” to be published in the Journal of Nondestructive Evaluation.
R.H. Huesman, G.T. Gullberg, W.L. Greenberg, and T.F. Budinger, Donner Algorithms for Reconstruction Tomography, 1977, Lawrence Berkeley Laboratory, University of California, Berkeley.
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© 1989 Springer Science+Business Media New York
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Tam, K.C. (1989). The Application of Convex Hull in Industrial X-Ray Computerized Tomography. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0817-1_50
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DOI: https://doi.org/10.1007/978-1-4613-0817-1_50
Publisher Name: Springer, Boston, MA
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