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Theoretical analysis of angular distribution of scattering in nozzle components using a response-function method for
Hideaki Ueda1, Michihiro Furusaka, Taeko Matsuura
1Faculty of Engineering, Hokkaido University, Sapporo, Japan. Author to whom any correspondence should be addressed.
Physics in Medicine and Biology
|December 14, 2017
Summary
A new method using triple Gaussian analysis quantifies proton beam divergence in spot-scanning proton therapy nozzles. This approach accurately characterizes beam broadening from individual components, improving treatment precision.
Area of Science:
- Medical Physics
- Radiation Oncology
- Particle Accelerator Technology
Background:
- Precise proton beam control is crucial in spot-scanning proton therapy to prevent beam spread.
- Nozzle components can induce beam divergence, affecting treatment accuracy.
Purpose of the Study:
- To develop and evaluate a novel method for calculating proton beam angular divergence within therapy nozzles.
- To systematically analyze beam broadening effects caused by individual nozzle components.
Main Methods:
- Utilized Monte Carlo simulations (Geant4) to calculate proton beam angular divergence.
- Fitted divergence profiles from nozzle components using triple Gaussian distributions.
- Applied convolution theorem for systematic calculation of overall nozzle divergence profiles.
Main Results:
- The triple Gaussian analysis effectively characterizes beam profiles and identifies scattering sources.
- Primary Gaussian component linked to air and dose monitors; secondary/tertiary to spot monitors and metal components.
- Quantitatively evaluated angular distributions from small to large angles.
Conclusions:
- The developed method provides a simple, generalized approach to understanding nozzle component effects on beam broadening.
- This analysis aids in optimizing nozzle design for improved proton therapy precision.
