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Improved electron collimation system design for Elekta linear accelerators.

Garrett M Pitcher1, Kenneth R Hogstrom1,2, Robert L Carver1,2

  • 1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA, USA.

Journal of Applied Clinical Medical Physics
|August 13, 2017
PubMed
Summary
This summary is machine-generated.

This study redesigned electron collimator trimmers for the Elekta Infinity accelerator, significantly reducing weight while maintaining beam flatness and acceptable leakage dose. The new designs simplify handling for radiotherapy teams.

Keywords:
electron Monte Carloelectron collimationleakage dosetherapeutic electron beams

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Area of Science:

  • Medical Physics
  • Radiation Therapy
  • Accelerator Technology

Background:

  • Current electron collimator applicators for the Elekta Infinity accelerator (MLCi2 treatment head) are excessively heavy.
  • Reducing trimmer weight is crucial for improving handling and usability by radiotherapy teams.
  • Maintaining beam flatness (±3% major axes, ±4% diagonals) and IEC leakage dose is essential.

Purpose of the Study:

  • To design and optimize prototype electron collimators (10 × 10 and 20 × 20-cm²) for the Elekta Infinity accelerator.
  • To significantly reduce the trimmer weight of current applicators.
  • To ensure the redesigned collimators maintain acceptable beam flatness and IEC leakage dose.

Main Methods:

  • Initial design using tungsten trimmers with constant thickness and specific off-axis ratios (OARs).
  • Application of five design modifications incorporating analytical and Monte Carlo (MC) calculations.
  • Optimization involved beveling outer edges, adjusting distances from isocenter, optimizing jaw positions, and modifying trimmer shapes and thickness.

Main Results:

  • Trimmer weights were reduced from 6.87 kg to 3.73 kg (10 × 10-cm²) and 10.49 kg to 5.09 kg (20 × 20-cm²).
  • Further weight reduction up to 4 kg is achievable for larger applicators (e.g., 25 × 25-cm²).
  • MC simulations confirmed acceptable in-field flatness and IEC-specified leakage dose at relevant energies.

Conclusions:

  • The developed design modifications successfully reduced electron collimator trimmer weights.
  • The optimized designs maintain critical beam characteristics (flatness, leakage dose).
  • These findings enable the design of lighter collimation systems for a wider range of applicator sizes, improving clinical workflow.