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Cone-beam CT from width-truncated projections. Comput Med Imaging Graph 1996 Jan-Feb;20(1):49-57

Date

01/01/1996

Pubmed ID

8891422

DOI

10.1016/0895-6111(96)00031-6

Scopus ID

2-s2.0-0029763942   49 Citations

Abstract

In this paper we report cone-beam CT techniques that permit reconstruction from width-truncated projections. These techniques are variants of Feldkamp's filtered backprojection algorithm and assume quasi-redundancy of ray integrals. Two methods are derived and compared. The first method involves the use of preconvolution weighting of the truncated data. The second technique performs post-convolution weighting preceded by non-zero estimation of the missing information. The algorithms were tested using the three-dimensional Shepp-Logan head phantom. The results indicate that given an appropriate amount of overscan, satisfactory reconstruction can be achieved. These techniques can be used to solve the problem of undersized detectors.

Author List

Cho PS, Rudd AD, Johnson RH

Author

Roger H. Johnson PhD Associate Professor in the Biophysics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Algorithms
Computer Simulation
Phantoms, Imaging
Radiographic Image Enhancement
Tomography, X-Ray Computed