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Radiation leakage dose from Elekta electron collimation system.

Garrett M Pitcher1, Kenneth R Hogstrom, Robert L Carver

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This study measured and calculated electron beam leakage doses for an Elekta Infinity accelerator, validating a Monte Carlo model. Results confirm the system meets International Electrotechnical Commission leakage dose criteria for improved electron collimator design.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Accelerator Technology

Background:

  • Accurate characterization of out-of-field radiation dose is crucial for patient safety and treatment planning in radiotherapy.
  • Developing lighter electron applicators with reduced leakage dose is a key objective for advanced radiotherapy systems.

Purpose of the Study:

  • To evaluate and document out-of-field leakage dose in the patient plane for an Elekta Infinity accelerator with MLCi2 treatment head.
  • To validate the accuracy of BEAMnrc Monte Carlo (MC) simulations for predicting out-of-field dose profiles.

Main Methods:

  • Off-axis dose profiles were measured in a water phantom using an ionization chamber for various beam energies and applicator sizes.
  • BEAMnrc MC simulations were performed for the same conditions and compared against experimental measurements.
  • EGSnrc LATCH bit filtering was used to analyze components of the leakage dose.

Main Results:

  • Measured in-field beam flatness met acceptance criteria on major and diagonal axes.
  • Out-of-field leakage doses met International Electrotechnical Commission (IEC) criteria, with cross-plane profiles showing higher leakage than in-plane.
  • MC calculations accurately predicted measured doses, with discrepancies mainly due to applicator component modeling.

Conclusions:

  • The Elekta Infinity accelerator with MLCi2 treatment head meets IEC leakage dose criteria in the patient plane.
  • The validated MC model is sufficiently accurate for designing a new, improved electron collimation system.
  • Collimator scatter contributes significantly to leakage dose, increasing with beam energy.