Browse > Article

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)
연도 인용수 순위
1 Glenn F. Knoll, 'Radiation Detection and Measurement,' John Wiley & Sons, Inc., New York, USA, (1989)
2 A. Kak and M. Slaney, 'Principles of Computerized Tomographic Imaging,' Electric Copy. IEEE Press, (1999)
3 김성수, 강지혜, '새로운 고속 EM 알고리즘', 한국정보과학회논문지, Vol. 31, No. 10, pp. 575-587, (2004)
4 한학용, '패턴인식 개론 - MATLAB 실습을 통입체적학습', 한빛미디어, (2005)
5 K. Lange and R. Carson, 'EM reconstruction algorithms for emission and transmission tomography,' Journal of Computer Assisted Tomography, Vol 8, No 2, pp. 306-316, (1984)   PUBMED
6 G. A Johansen, 'Gamma ray tomography software and image reconstruction,' IAEA/RCA Regional Training Course on Industrial Process Gamma Tomography, Korea, (2004)
7 김영환 외, '고에너지 방사선을 이용한 공업용 CT 시스템 개발', 한국원자력연구소 최종보고서, (2000)
8 J. B. Kim, S. H. Jung and J. S. Kim, 'The comparison of the iterative and filtered back projection method for a gamma-ray CT,' KNS Spring Conference, Korea (2006)
9 J. B. Kim, S. H. Jung and J. S. Kim, 'A study on an industrial CT by using a high energy gamma-ray,' ICEE, Korea (2006)
10 K. Anil, Jain, 'Fundamentals of Digital Image Processing,' Prentice Hall, Englewood Cliffs, pp. 431-475, (1989)
11 B. D. Cullity, 'Elements of X-ray Diffraction,' 2nd Ed. Addison-Wesley Pub. pp.33 3-31, (1978)
12 J. B. Kim, S. H. Jung and J. S. Kim, 'A study on industrial gamma-ray CT with a single source and detector pair,' Journal of Korean Nuclear Society, Vol. 38, No.4, (2006)   과학기술학회마을