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Proton FLASH: passive scattering or pencil beam scanning?

Guoliang Zhang1, Junliang Wang2, Yuenan Wang3

  • 1Department of Medical Physics, Wuhan University, 430072, People's Republic of China.

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|December 9, 2020
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Summary

This study compared proton FLASH radiotherapy dose delivery efficiency between passive scattering and pencil beam scanning (PBS). PBS demonstrated significantly higher dose rates, crucial for achieving the FLASH effect in cancer treatment.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Particle Therapy

Background:

  • Proton FLASH radiotherapy offers potential advantages for cancer treatment due to ultra-high dose rates.
  • Optimizing dose delivery efficiency is critical for realizing the full benefits of FLASH therapy.
  • Understanding the performance of different delivery modes is essential for clinical implementation.

Purpose of the Study:

  • To directly compare the dose delivery efficiency of passive scattering and pencil beam scanning (PBS) for proton FLASH therapy.
  • To establish a benchmark for dose rate performance across various delivery scenarios and beam parameters.
  • To inform the selection of optimal delivery modes and beam currents for achieving therapeutically relevant dose rates.

Main Methods:

  • Monte Carlo simulations using the Geant4 package to model proton beamlines.
  • Investigation of two proton energies (63 and 230 MeV) and two field sizes (13x13 mm², 50x50 mm²).
  • Analysis of four delivery scenarios: passive scattering (Bragg peak, shoot-through) and PBS (Bragg peak, shoot-through), considering beamline components.

Main Results:

  • Pencil beam scanning (PBS) with shoot-through achieved significantly higher dose rates (e.g., 2.6 Gy/s at 230 MeV, 1 nA) compared to passive scattering (e.g., 0.05 Gy/s).
  • Dose rate varied considerably based on delivery mode, energy, field size, and beamline components.
  • A quantitative comparison provided a reference for dose rate performance across different proton FLASH delivery configurations.

Conclusions:

  • Pencil beam scanning (PBS) is a more efficient delivery mode for achieving the ultra-high dose rates required for proton FLASH radiotherapy.
  • The study provides crucial data for predicting beam current needs to achieve FLASH dose rate thresholds.
  • Results aid in optimizing proton therapy techniques for enhanced clinical outcomes.