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Fast implementation of the image reconstruction algorithm OPED.
Proc. SPIE 7258:72585F (2009)
OPED is a reconstruction algorithm for Radon data based on orthogonal polynomial expansion on the disk. The algorithm involves a sum of N terms, which is determined by the number of view angles in the data. Evaluating on a rectangular grid of M×M pixels, the algorithm can be implemented with roughly O(N3) evaluations, if we assume M [approximate] N, and the constant is rather large. The new implementation uses a particular polar grid, so that the evaluation operation is reduced to 2N3 + O(N2 logN), a reduction of the evaluation time by a factor of more than 20 times. Linear interpolation on triangle is used to reduce our particular polar grid to the rectangular grid. Numerical experiments are presented to demonstrate the results.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Herausgeber
Samei, E.* ; Hsieh, J.*
Sprache
englisch
Veröffentlichungsjahr
2009
HGF-Berichtsjahr
0
ISSN (print) / ISBN
0277-786X
e-ISSN
1996-756X
Zeitschrift
Proceedings of SPIE
Quellenangaben
Band: 7258,
Artikelnummer: 72585F
Reihe
Proceedings of SPIE
Verlag
SPIE
Verlagsort
Bellingham, WA
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Radiation Protection (ISS)
POF Topic(s)
30504 - Mechanisms of Genetic and Environmental Influences on Health and Disease
Forschungsfeld(er)
Radiation Sciences
PSP-Element(e)
G-501100-008
Scopus ID
66749188429
Erfassungsdatum
2009-11-24