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Technical Note: Optimization of spot and trimmer position during dynamically collimated proton therapy.

Blake R Smith1, Daniel E Hyer2, Ryan T Flynn2

  • 1Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, 53705, USA.

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A new optimization method for dynamically collimated proton therapy (DCPT) improves treatment planning. This direct parameter optimization (DPO) enhances target conformity and spares healthy tissue compared to conventional methods.

Keywords:
dynamic collimationoptimizationproton therapy

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Computational Biology

Background:

  • Dynamically collimated proton therapy (DCPT) is an emerging technology for precise cancer treatment.
  • Previous DCPT optimization methods relied on fixed trimmer positions, potentially limiting treatment plan quality.
  • A need exists for advanced optimization strategies to fully leverage DCPT capabilities.

Purpose of the Study:

  • To introduce and evaluate a novel theoretical optimization design for DCPT.
  • This design integrates beam spot and trimmer positioning with beamlet weighting.
  • To compare the performance of the new design against existing DCPT plan optimization methods.

Main Methods:

  • A direct parameter optimization (DPO) method was developed for cohesive optimization of beam spot, trimmer positions, and beamlet weights.
  • Numerical gradients were used to quantify parameter impacts on an objective function.
  • DPO was compared to the conventional trimmer selection algorithm (TSA) using brain treatment plans.

Main Results:

  • The DPO method demonstrated improved target conformity and healthy tissue sparing compared to TSA.
  • An average conformity index improvement of 5.5% was observed with DPO.
  • DPO also resulted in reduced radiation dose to organs at risk.

Conclusions:

  • Both TSA and DPO can achieve highly conformal treatments with dynamic collimation system (DCS) technology.
  • Simultaneous optimization of beam spot position, trimmer location, and beamlet weights using DPO offers superior target conformity and healthy tissue sparing.
  • The DPO method represents a significant advancement in DCPT treatment planning optimization.