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Comparative Analysis of the Weight Functions for the Reconstruction of a Gamma-ray CT based on the EM Technique  

Lee, Na-Young (Korea Atomic Energy Research Institute)
Jung, Sung-Hee (Korea Atomic Energy Research Institute)
Kim, Jong-Bum (Korea Atomic Energy Research Institute)
Kim, Jin-Sup (Korea Atomic Energy Research Institute)
Kim, Jae-Ho (Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.27, no.5, 2007 , pp. 449-458 More about this Journal
Abstract
In this paper, we reconstructed the cross-sectional images of two phantoms simulating a petrochemical process from gamma radiation measurements. Three different weight functions for EM image reconstruction algorithm were built and compared with histograms representing the variance of the homogeneity of the phantom material, The radiation source, $^{137}Cs$, collimated by a lead with 5 mm diameter aperture and the measurement was made with a lead shielded 1inch NaI detector. As a result, the method taking into account the beam area in each pixel for a weight function showed the best resolution among the three methods.
Keywords
Industrial Gamma-ray CT; Large Plant Diagnosis Image Reconstruction; EM(expectation maximization) Algorism; Weight Function; Histogram;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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