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Digital Tomography Incorporating a Priori Information

  • K. C. Tam
  • L. J. ThomasIII
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

The technique of tomography has long been used in radiography and in nuclear medicine to sharpen images of objects on the tomographic plane and to blur images of objects on the off-planes. The method is illustrated in Figure 1. Suppose one is interested in examining the plane T in the object. The x-ray source and the film are moved parallel to each other in the opposite directions with the plane of interest as the fulcrum. This is achieved by choosing the velocity v 1 of the x-ray source and the velocity v 2 of the film such that the ratio v 1/v 2 is equal to d 1/d 2, where dl is the source-to-plane distance, and d 2 is the plane-to-film distance. The objects on the plane of interest are in focus, whereas the objects on the other planes are out of focus and blurred. However, the blurrings could become quite serious in some cases and interfere with the objects of interest.

Keywords

Point Spread Function Copper Wire Angular Range Adjacent Plane Object Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    S.F. Buchele, “Quantitative Computerized Laminography”, in Review of Progress in Quantitative NDE, University of California, San Diego, July 31-August 5, 1988.Google Scholar
  2. 2.
    M. D. Barker, “Laminographic Reconstruction From Real-Time Radiographic Images”, in Review of Progress in Quantitative NDE, University of California, San Diego, July 31-August 5, 1988.Google Scholar
  3. 3.
    J.H. Stanley, J.L. Chambers, and Mi. Boyle, “A New NDE Capability For Thin-Shelled Structures”, AFWAL-TR-84–4120.Google Scholar
  4. 4.
    K.C. Tam, V. Perez-Mendez, and B. Macdonald, “3-D Object Reconstruction in Emission and Transmission Tomography with Limited Angular Input”, IEEE Trans. Nucl. Sci., NS-26, p. 2797, 1979.CrossRefGoogle Scholar
  5. 5.
    K.C. Tam and V. Perez-Mendez, “Tomographical Imaging with Limited-Angle Input”, J. Opt. Soc. Am., 71, p. 582, 1981.MathSciNetCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • K. C. Tam
    • 1
  • L. J. ThomasIII
    • 1
  1. 1.GE Corporate Research and DevelopmentSchenectadyUSA

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