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Collimator based tracking with an add-on multileaf collimator: Moduleaf.

A Böhler1, H Weichenberger, C Gaisberger

  • 1Institute for Research and Development on Advanced Radiation Technologies, Paracelsus Medical University, Strubergasse 21, 5020 Salzburg, Austria.

Physics in Medicine and Biology
|April 1, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a modified Siemens Moduleaf collimator for real-time tracking in radiotherapy, significantly reducing penumbra width for moving targets. The developed system enables more precise radiation delivery for cancer treatment.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Biomedical Engineering

Background:

  • Radiotherapy is a cornerstone of cancer treatment.
  • Accurate irradiation of moving targets remains a significant challenge in modern radiotherapy.
  • Existing systems may require extensive modifications to linear accelerators.

Purpose of the Study:

  • To develop and verify a real-time tracking system for radiotherapy using a modified Siemens Moduleaf add-on collimator.
  • To assess the system's latency and its impact on dose delivery accuracy for moving targets.
  • To evaluate the potential of the system in reducing treatment margins.

Main Methods:

  • Modification of the Siemens Moduleaf collimator with software-based adaptations and component upgrades.
  • Independent operation from the linear accelerator (LinAc), requiring no LinAc modifications.
  • Latency measurement by comparing target and leaf positions.
  • Dose measurement using Gafchromic EBT2 film in a moving 4D phantom to assess penumbra width.

Main Results:

  • The modified Moduleaf system demonstrated a significant reduction in penumbra width from 23 mm to 4 mm for 0.1 Hz sinusoidal movements.
  • System latency was measured to be less than 50 ms.
  • The system achieved a maximum tracking speed of 20 mm/s.

Conclusions:

  • A tracking-capable add-on collimator, like the modified Moduleaf, is a valuable tool for improving radiotherapy precision.
  • The system effectively reduces margins required for treating small, slow-moving targets.
  • Software-based modifications to existing collimators offer a practical approach to advanced radiotherapy techniques.