Numerical Simulations to Evaluate and Compare the Performances of Existing and Novel Degrader Materials for Proton Therapy

TL;DR

This study uses detailed GEANT4 simulations to evaluate and compare the performance of existing and novel degrader materials for proton therapy, focusing on beam emittance and transmission to optimize design and cost.

Contribution

It provides a comprehensive comparison of traditional and new degrader materials using simulations and semi-analytical models, highlighting potential improvements with novel materials.

Findings

Novel materials show potential for reduced beam emittance

Simulations identify differences in transmission efficiency

Comparison with semi-analytical models validates results

Abstract

The performance of the energy degrader in terms of beam properties directly impacts the design and cost of cyclotron-based proton therapy centers. The aim of this study is to evaluate the performances of different existing and novel degrader materials. The quantitative estimate is based on detailed GEANT4 simulations that analyze the beam-matter interaction and provide a determination of the beam emittance increase and transmission. Comparisons between existing (aluminum, graphite, beryllium) and novel (boron carbide and diamond) degrader materials are provided and evaluated against semi-analytical models of multiple Coulomb scattering. The results showing a potential in emittance reduction for novel materials are presented and discussed in detail.