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Related Experiment Videos

Tomographic imaging of the angular-dependent coherent-scatter cross section

M S Westmore1, A Fenster, I A Cunningham

  • 1Imaging Research Laboratories, John P. Robarts Research Institute, London, Ontario, Canada.

Medical Physics
|January 1, 1997
PubMed
Summary

A novel computed tomographic (CT) imaging system captures coherent X-ray scatter patterns to create material-specific images. This coherent-scatter CT (CSCT) technology accurately maps material properties, potentially aiding in bone-mineral content measurement.

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Area of Science:

  • Medical Imaging
  • Materials Science
  • Physics

Background:

  • X-ray diffraction provides insights into material properties.
  • Coherent scatter dominates low-angle X-ray scatter in the diagnostic energy range.
  • Current CT imaging primarily relies on X-ray attenuation, lacking detailed material characterization.

Purpose of the Study:

  • To introduce a new computed tomographic (CT) imaging system utilizing low-angle X-ray diffraction.
  • To demonstrate the capability of coherent-scatter CT (CSCT) in imaging material-specific properties.
  • To assess the accuracy of CSCT in reconstructing angular-dependent coherent-scatter cross sections.

Main Methods:

  • Developed a special-purpose CT system to measure low-angle (0-10 degrees) X-ray diffraction.

Related Experiment Videos

  • Employed first-generation CT geometry to acquire diffraction patterns for each pencil beam.
  • Reconstructed images representing coherent-scatter intensity at various angles to generate cross sections per pixel.

    • Main Results:

    • Successfully imaged a phantom with various materials (polyethylene, Lucite, polycarbonate, nylon) using CSCT.
    • Generated coherent-scatter cross sections for each pixel and compared them with separately measured values.
    • Achieved excellent agreement between CSCT-derived and measured cross sections, validating the imaging accuracy.

    Conclusions:

    • The developed CSCT system accurately images angular-dependent coherent-scatter cross sections within a tomographic slice.
    • CSCT provides material-specific information, distinguishing between different materials based on their scatter properties.
    • This technology holds long-term potential for applications like precise bone-mineral content measurement.