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Development and evaluation of an exact fan‐beam reconstruction algorithm using an equal weighting scheme via locally compensated filtered backprojection (LCFBP)
Author(s) -
Chen GuangHong,
Tokalkanahalli Ranjini,
Zhuang Tingliang,
Nett Brian E.,
Hsieh Jiang
Publication year - 2006
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2165416
Subject(s) - weighting , algorithm , scheme (mathematics) , mathematics , iterative reconstruction , computer science , artificial intelligence , physics , mathematical analysis , acoustics
A novel exact fan‐beam image reconstruction formula is presented and validated using both phantom data and clinical data. This algorithm takes the form of the standard ramp filtered backprojection (FBP) algorithm plus local compensation terms. This algorithm will be referred to as a locally compensated filtered backprojection (LCFBP). An equal weighting scheme is utilized in this algorithm in order to properly account for redundantly measured projection data. The algorithm has the desirable property of maintaining a mathematically exact result for: the full scan mode ( 2 π ) , the short scan mode ( π + full fan angle), and the supershort scan mode [less than ( π + full fan angle)]. Another desirable feature of this algorithm is that it is derivative‐free. This feature is beneficial in preserving the spatial resolution of the reconstructed images. The third feature is that an equal weighting scheme has been utilized in the algorithm, thus the new algorithm has better noise properties than the standard filtered backprojection image reconstruction with a smooth weighting function. Both phantom data and clinical data were utilized to validate the algorithm and demonstrate the superior noise properties of the new algorithm.