Abstract
A deterministic method for artifact-free reconstruction from truncated sets of fan-beam projections that extends the artifact-free zone of fan-beam scanners is presented. Truncated partial sets of projections are merged into a complete virtual set of projections before reconstruction through synthetic scanner arrays. The reconstruction from the virtual set of projections yields the artifact-free representation of the whole object needed for evaluation of its global structure. The extent of the artifact-free zone in reconstructions from cone-beam projections is evaluated. The concept of synthetic linear and circular scanner arrays for reconstruction from truncated sets of projections is extended to cone-beam geometry. It is shown that linear scanner arrays are not directly applicable to cone-beam geometry but yield reasonable approximations if the partial sets of projections are resorted into a virtual set of wedge-beam projections before reconstruction. The presented solution constitutes a practical and exact deterministic method of horizontally extending the artifact-free zone in cone-beam geometry. The extension of the vertical limits of the artifact-free zone is discussed. The proposed methods provide a practical low-cost approach to artifact-free reconstruction of large objects. Illustrative examples are provided.
© 1994 Optical Society of America
Full Article | PDF ArticleMore Like This
Martin Müller and Gonzalo R. Arce
J. Opt. Soc. Am. A 11(9) 2410-2428 (1994)
Martin Müller and Gonzalo R. Arce
Appl. Opt. 35(20) 3902-3914 (1996)
Nagaaki Ohyama, Soichi Inoue, Hideaki Haneishi, Jumpei Tsujiuchi, and Toshio Honda
Appl. Opt. 28(24) 5338-5341 (1989)