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• W3002939424 endingPage "e03279" @default.
• W3002939424 startingPage "e03279" @default.
• W3002939424 abstract "The system matrix (SM) being a main part of statistical image reconstruction algorithms establishes relationship between the object and projection space. The aim was to determine it in a short duration time, towards obtaining the best quality of contrast images. In this study, a new analytical method based on Cavalieri's principle as subdividing common regions has been proposed in which the precision of the amounts of estimated areas was improved by increasing the number of divisions (NOD), and consequently the total SM's time was increased. An important issue is the tradeoff between the NODs and computational time. For this purpose, a Monte Carlo simulated Jaszczak phantom study was performed by the Monte Carlo N-Particle transport code version 5 (MCNP5) in which the tomographic images of resolution and contrast phantoms were reconstructed by maximum likelihood expectation maximization (MLEM) algorithm, and the influence of NODs variations was investigated. The results show that the lowest and best quality have been obtained at the NODs of 0 and 8, respectively and in the optimum case, the SM's total time at NOD of 8 was 925 s, which was much lower than those of the conventional Monte Carlo simulations and experimental test." @default.
• W3002939424 created "2020-01-30" @default.
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• W3002939424 date "2020-01-01" @default.
• W3002939424 modified "2023-10-01" @default.
• W3002939424 title "Estimation of optimized timely system matrix with improved image quality in iterative reconstruction algorithm: A simulation study" @default.
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• W3002939424 doi "https://doi.org/10.1016/j.heliyon.2020.e03279" @default.
• W3002939424 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6976947" @default.
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