Title

Evaluation And Empirical Analysis Of An Exact Fbp Algorithm For Spiral Cone-Beam Ct

Keywords

Cone-beam data; Exact inversion; Filtered back-projection algorithm; Spiral tomography

Abstract

Recently one of the authors proposed a reconstruction algorithm, which is theoretically exact and has the truly shift-invariant filtering and backprojection structure. Each voxel is reconstructed using the theoretically minimum section of the spiral, which is located between the endpoints of the PI segment of the voxel. Filtering is one-dimensional, performed along lines with variable tilt on the detector, and consists of five terms. We will present evaluation of the performance of the algorithm. We will also discuss and illustrate empirically the contributions of the five filtering terms to the overall image. A thorough evaluation proved the validity of the algorithm. Excellent image results were achieved even for high pitch values. Overall image quality can be regarded as at least equivalent to the less efficient, exact, Radon-based methods. However, the new algorithm significantly increases efficiency. Thus, the method has the potential to be applied in clinical scanners of the future. The empirical analysis leads to a simple, intuitive understanding of the otherwise obscure terms of the algorithm. Identification and skipping of the practically irrelevant fifth term allows significant speed-up of the algorithm due to uniform distance weighting.

Publication Date

9-15-2003

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

5032 II

Number of Pages

663-674

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.481348

Socpus ID

0041874882 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0041874882

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