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Related Experiment Videos

Scatter in computed radiography

D M Tucker1, M Souto, G T Barnes

  • 1Department of Radiology, University of Alabama Hospitals and Clinics, Birmingham 35233.

Radiology
|July 1, 1993
PubMed
Summary
This summary is machine-generated.

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Scatter radiation significantly impacts computed radiography (CR) imaging plates (IPs), with higher forward scatter ratios compared to screen-film systems. Lead foil in CR cassettes is recommended to mitigate backscatter effects.

Area of Science:

  • Medical Imaging Physics
  • Radiological Science
  • Digital Radiography

Background:

  • Storage phosphor computed radiography (CR) utilizes imaging plates (IPs) for digital image acquisition.
  • Scatter radiation is a known artifact that can degrade image quality in radiography.
  • Understanding scatter effects is crucial for optimizing CR system performance.

Purpose of the Study:

  • To evaluate the impact of scatter radiation on CR imaging.
  • To quantify forward scatter and backscatter effects separately in CR imaging plates (IPs).
  • To compare scatter characteristics between CR IPs and conventional screen-film systems.

Main Methods:

  • Extended the scatter degradation factor to analyze forward and backscatter independently.
  • Measured ratios of forward scatter to primary radiation (sf/p) and backscatter to primary radiation (sb/p) across varying parameters.

Related Experiment Videos

  • Evaluated CR IPs and a standard screen-film system under diverse x-ray potentials, phantom thicknesses, and field sizes.

    • Main Results:

    • Backscatter to primary radiation (sb/p) values for IPs ranged from 0.05 to 3.80.
    • CR IPs exhibited 40%-70% higher forward scatter ratios (sf/p) than screen-film systems.
    • When backscatter was included, CR IPs showed 50%-120% higher scatter contributions compared to screen-film.

    Conclusions:

    • Standard CR cassettes lack lead foil, necessitating its inclusion to control backscatter.
    • Differences in K-absorption edges of barium and gadolinium contribute to higher scatter in IPs.
    • CR systems require specific strategies to manage scatter radiation effectively for improved image quality.