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Fourier rebinning algorithm for inverse geometry CT
Author(s) -
Mazin Samuel R.,
Pelc Norbert J.
Publication year - 2008
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 - 10.1118/1.2986155
Subject(s) - algorithm , geometry , iterative reconstruction , reconstruction algorithm , fourier transform , tomography , noise (video) , mathematics , computer science , optics , computer vision , physics , mathematical analysis , image (mathematics)
Inverse geometry computed tomography (IGCT) is a new type of volumetric CT geometry that employs a large array of x‐ray sources opposite a smaller detector array. Volumetric coverage and high isotropic resolution produce very large data sets and therefore require a computationally efficient three‐dimensional reconstruction algorithm. The purpose of this work was to adapt and evaluate a fast algorithm based on Defrise's Fourier rebinning (FORE), originally developed for positron emission tomography. The results were compared with the average of FDK reconstructions from each source row. The FORE algorithm is an order of magnitude faster than the FDK‐type method for the case of 11 source rows. In the center of the field‐of‐view both algorithms exhibited the same resolution and noise performance. FORE exhibited some resolution loss (and less noise) in the periphery of the field‐of‐view. FORE appears to be a fast and reasonably accurate reconstruction method for IGCT.