Share Email Print
cover

Proceedings Paper

Sampling The Radon Transformation In Conventional Computed Tomography
Author(s): Dennis L. Parker; Vernon Smith; Kristian R. Peschmann; John L. Couch
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

The sampling geometry for conventional, multidetector, computed tomography is illustrated in terms of the Radon transformation for both rotate-rotate (3rd generation fan beam) and rotate-stationary (4th generation fan beam) scanners. By deriving an expression for the outline of the sampling region in the Radon transformation for each detector measurement it is demonstrated that the entire Radon transformation can be covered by non-overlapping sampling regions with the assumption of negligible detector dead space. An expression for angular aliasing is derived which demonstrates that object dependent artifacts can occur if the angular width of the sampling regions in conjunction with the angular sampling increment does not provide sufficient suppression of the high order angular harmonics in the representation of the scanned object. The number of views necessary to suppress angular aliasing, as well as the potential spatial resolution and general image quality are shown to be fundamentally related to the size, shape, and relative orientation of the Radon transformation sampling regions.

Paper Details

Date Published: 16 July 1981
PDF: 12 pages
Proc. SPIE 0273, Application of Optical Instrumentation in Medicine IX, (16 July 1981); doi: 10.1117/12.931820
Show Author Affiliations
Dennis L. Parker, University of California at San Francisco (United States)
Vernon Smith, University of California at San Francisco (United States)
Kristian R. Peschmann, University of California at San Francisco (United States)
John L. Couch, University of California at San Francisco (United States)


Published in SPIE Proceedings Vol. 0273:
Application of Optical Instrumentation in Medicine IX
James A. Mulvaney; Joel E. Gray; Arthur G. Haus; William S. Properzio, Editor(s)

© SPIE. Terms of Use
Back to Top