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A direct reconstruction method with variable constraints
Author(s) -
Liu Li,
Wang Yuanmei
Publication year - 1999
Publication title -
international journal of imaging systems and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.359
H-Index - 47
eISSN - 1098-1098
pISSN - 0899-9457
DOI - 10.1002/(sici)1098-1098(1999)10:5<379::aid-ima2>3.0.co;2-5
Subject(s) - projection (relational algebra) , variable (mathematics) , computer science , upper and lower bounds , constant (computer programming) , iterative reconstruction , algorithm , image resolution , mathematics , computer vision , mathematical analysis , programming language
In this article, a direct method to reconstruct images from projections is presented. This method, having its origin in astrophysics to restore images from observed data, uses a constant upper bound and a variable lower bound to constrain the maximum and minimum values taken by the emission intensity during iteration. Computer‐simulated emission projection data from two phantoms are used for reconstruction. Comparison is made with other methods. The results show that a much better spatial resolution can be acquired by this method, especially for the sharp‐shaped emission sources. © 1999 John Wiley & Sons, Inc. Int J Imaging Syst Technol 10, 379–384, 1999