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Cross-sectional imaging system using a polychromatic x-ray source

  • US 3,965,358 A
  • Filed: 12/06/1974
  • Issued: 06/22/1976
  • Est. Priority Date: 12/06/1974
  • Status: Expired due to Term
First Claim
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1. An improved cross-sectionsl imaging apparatus of the type wherein a polychromatic x-ray beam is projected through a cross-section of an object at a plurality of angles and wherein the resultant transmitted beam is detected and applied to a reconstruction computer where the detected transmission data is used to reconstruct the density of the cross-section and the reconstructed image information is applied to a display, wherein the improvement comprises:

  • means for detecting a plurality of x-ray transmission signals representing the intensity of different energy spectra of the transmitted polychromatic x-ray beam;

    means for deriving the logarithm of each of the x-ray transmission signals; and

    means for deriving a weighted sum of each of the logarithms of the x-ray transmission signals and applying the weighted sum signal to the reconstruction computer.

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