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Related Experiment Videos

Lubberts effect in columnar phosphors.

Aldo Badano1, Robert M Gagne, Brandon D Gallas

  • 1Laboratory for the Assessment of Medical Imaging Systems, Center for Devices and Radiological Health (FDA) and National Institute of Biomedical Imaging and Bioengineering (NIH), Rockville, Maryland 20857, USA. aldo.badano@fda.hhs.gov

Medical Physics
|December 14, 2004
PubMed
Summary
This summary is machine-generated.

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The Lubberts effect in x-ray imaging was studied in columnar phosphors for digital mammography. Noise transfer in columnar screens was found to be similar to granular screens, challenging previous assumptions.

Area of Science:

  • Medical Physics
  • Image Science
  • Materials Science

Background:

  • Noise transfer in granular x-ray imaging phosphor screens is not proportional to the square of the signal transfer magnitude.
  • This phenomenon, known as the Lubberts effect, has not been studied in columnar structured screens due to a lack of generalized depth-dependent light transport descriptions.
  • Columnar phosphors are crucial in digital mammography detectors.

Purpose of the Study:

  • To investigate the signal and noise transfer characteristics of columnar phosphors in digital mammography detectors.
  • To analyze the Lubberts effect in columnar screens using optical Monte Carlo simulations.
  • To compare the Lubberts fraction of columnar phosphors with granular phosphors.

Main Methods:

  • Utilized DETECT-II, an optical Monte Carlo light transport simulation code.

Related Experiment Videos

  • Validated optical parameters using published normalized modulation transfer function (MTF) experimental data for granular and columnar screens.
  • Calculated signal and noise transfer functions, and the Lubberts fraction for various screen thicknesses.

    • Main Results:

    • Simulated MTFs for granular and columnar screens matched empirically measured data.
    • The Lubberts fraction for an 85 micrometer granular screen model (Gd2O2S:Tb) was found to be similar to that of a 100 micrometer columnar CsI:Tl screen.
    • Demonstrated the applicability of the Lubberts effect analysis to columnar phosphors.

    Conclusions:

    • The study provides a generalized description of depth-dependent light transport in columnar phosphors.
    • The Lubberts effect is comparable between granular and columnar phosphor screens used in digital mammography.
    • Findings contribute to a better understanding of noise transfer in advanced digital x-ray imaging systems.