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Related Experiment Video

Updated: Jun 22, 2026

Use of Sacrificial Nanoparticles to Remove the Effects of Shot-noise in Contact Holes Fabricated by E-beam Lithography
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Electron beam quality control using an amorphous silicon EPID.

J A Beck1, G J Budgell, D A Roberts

  • 1North Western Medical Physics, Christie Hospital NHS Foundation Trust, Withington, Manchester M20 4BX, United Kingdom. james.beck@physics.cr.man.ac.uk

Medical Physics
|June 24, 2009
PubMed
Summary
This summary is machine-generated.

Amorphous silicon electronic portal imaging devices (EPIDs) are effective for linear accelerator electron beam quality control. They provide accurate daily constancy checks, showing good agreement with ion chamber measurements.

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Last Updated: Jun 22, 2026

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Imaging Technology

Background:

  • Quality control for linear accelerator electron beams is crucial for patient safety.
  • Electronic portal imaging devices (EPIDs) are increasingly used in radiation therapy.

Purpose of the Study:

  • To evaluate the suitability of an amorphous silicon EPID for quality control constancy measurements of linear accelerator electron beams.
  • To assess the EPID's linearity, profile measurement accuracy, and long-term stability.

Main Methods:

  • Investigated EPID grayscale response linearity with dose.
  • Analyzed beam profile alterations due to air scatter.
  • Compared EPID measurements with 2D diode array and ion chamber data.
  • Developed a Monte Carlo model of the EPID for validation.

Main Results:

  • EPID grayscale response showed high linearity with dose, with minor discrepancies at 6 MeV.
  • Air scatter significantly affected beam profiles, but relative changes in flatness/symmetry were linear.
  • Daily EPID output measurements closely matched ion chamber results (0.8% std dev).
  • Monte Carlo simulations confirmed EPID's accurate measurement of electron profiles in water.

Conclusions:

  • Amorphous silicon EPIDs are effective for daily constancy checks of electron beams.
  • The EPID provides accurate and reliable data for quality assurance in radiation therapy.
  • EPID measurements demonstrate good agreement with established dosimetry methods.