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Related Experiment Videos

Lag correction model and ghosting analysis for an indirect-conversion flat-panel imager.

Noor Mail1, Peter O'Brien1, Geordi Pang1

  • 1Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada.

Journal of Applied Clinical Medical Physics
|August 23, 2007
PubMed
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Image lag artifacts in megavoltage cone-beam digital tomosynthesis (CBDT) can be corrected using a developed model for indirect-conversion flat-panel imagers (FPIs). Ghosting effects were found to be insignificant, improving CBDT implementation in radiotherapy.

Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Diagnostic Imaging

Background:

  • Cone-beam digital tomosynthesis (CBDT) offers rapid tomographic imaging for radiotherapy.
  • Image artifacts like lag and ghosting are potential issues with megavoltage (MV) X-ray detectors.
  • Indirect-conversion flat-panel imagers (FPIs) are used in MV-CBDT systems.

Purpose of the Study:

  • To develop a model for correcting image lag in FPIs used for MV-CBDT.
  • To analyze and quantify image lag in an indirect-conversion FPI under MV irradiation.
  • To assess the significance of ghosting effects in these FPIs.

Main Methods:

  • Developed a mathematical model for image lag correction.
  • Measured image lag using an indirect-conversion FPI irradiated with a 6-MV X-ray beam.

Related Experiment Videos

  • Quantified ghosting effects in the same FPI setup.

    • Main Results:

    • The developed model demonstrated effective correction of image lag.
    • Image lag in the indirect-conversion FPI was found to be correctable.
    • Ghosting effects were measured and determined to be insignificant.

    Conclusions:

    • Image lag in MV-CBDT using indirect-conversion FPIs can be successfully corrected.
    • The developed correction model enhances the feasibility of MV-CBDT.
    • Ghosting is not a significant concern for this imaging modality.