Title

Exact Consideration Of Data Redundancies For Spiral Cone-Beam Ct

Keywords

Computed tomography; Cone-beam; Data redundancy; Filtered backprojection algorithm; Image reconstruction; Reduced pitch; Spiral CT; Theoretically exact

Abstract

In multi-slice spiral computed tomography (CT) there is an obvious trend in adding more and more detector rows. The goals are numerous: volume coverage, isotropic spatial resolution, and speed. Consequently, there will be a variety of scan protocols optimizing clinical applications. Flexibility in table feed requires consideration of data redundancies to ensure efficient detector usage. Until recently this was achieved by approximate reconstruction algorithms only. However, due to the increasing cone angles there is a need of exact treatment of the cone beam geometry. A new, exact and efficient 3-PI algorithm for considering three-fold data redundancies was derived from a general, theoretical framework based on 3D Radon inversion using Grangeat's formula. The 3-PI algorithm possesses a simple and efficient structure. This publication deals with a thorough evaluation of the performance of the 3-PI algorithm in comparison to the 1-PI method for non-redundant data. Image quality of the 3-PI algorithm is superior. The prominent spiral artifacts and other discretization artifacts are significantly reduced due to averaging effects when taking into account redundant data. Certainly signal-to-noise ratio is increased. The computational expense is comparable even to that of approximate algorithms. The 3-PI algorithm proves its practicability for applications in medical imaging.

Publication Date

10-27-2004

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

5370 III

Number of Pages

2034-2045

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.535249

Socpus ID

5644253035 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/5644253035

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