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<p>This study introduces a novel daily quality assurance (QA) method for pencil beam scanning (PBS) proton therapy that simplifies conventional complex procedures while maintaining high accuracy. Two custom-designed pattern phantoms were developed using GafChromic EBT3 films: a Range Verification phantom featuring a spiral staircase structure (PMMA, 2–12&#xa0;mm thickness) for simultaneous multi-depth measurements, and a Spot Position Verification phantom with concentric circular patterns (alternating PMMA/Pb layers) for position monitoring. In comprehensive testing, the Range Verification phantom demonstrated precise detection of ± 1&#xa0;mm range variations across proton energies from 103 to 200&#xa0;MeV, evidenced by distinctive film darkening patterns. Notably, at 103&#xa0;MeV, −&#xa0;1&#xa0;mm range errors produced characteristic darkening at 10&#xa0;mm depth, clearly distinguishable from reference patterns. The Spot Position phantom achieved accurate visualization of position variations within ± 2&#xa0;mm at 125&#xa0;MeV through pattern asymmetry analysis. This QA method successfully meets AAPM TG-224 tolerance requirements for both range (± 1&#xa0;mm) and spot position (± 2&#xa0;mm). Its key advantages include immediate visual verification through reference film comparison and simplified daily implementation, making it a practical solution for clinical proton therapy QA.</p>

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A simple daily QA method for PBS proton therapy using patterned phantoms and EBT3 film

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Young Kyu Lee,
  • Wonjoong Cheon,
  • Haksoo Kim,
  • Se Byeong Lee,
  • Young Kyung Lim,
  • Jong Hwi Jeong,
  • Chankyu Kim,
  • Young-Nam Kang,
  • Dongho Shin

摘要

This study introduces a novel daily quality assurance (QA) method for pencil beam scanning (PBS) proton therapy that simplifies conventional complex procedures while maintaining high accuracy. Two custom-designed pattern phantoms were developed using GafChromic EBT3 films: a Range Verification phantom featuring a spiral staircase structure (PMMA, 2–12 mm thickness) for simultaneous multi-depth measurements, and a Spot Position Verification phantom with concentric circular patterns (alternating PMMA/Pb layers) for position monitoring. In comprehensive testing, the Range Verification phantom demonstrated precise detection of ± 1 mm range variations across proton energies from 103 to 200 MeV, evidenced by distinctive film darkening patterns. Notably, at 103 MeV, − 1 mm range errors produced characteristic darkening at 10 mm depth, clearly distinguishable from reference patterns. The Spot Position phantom achieved accurate visualization of position variations within ± 2 mm at 125 MeV through pattern asymmetry analysis. This QA method successfully meets AAPM TG-224 tolerance requirements for both range (± 1 mm) and spot position (± 2 mm). Its key advantages include immediate visual verification through reference film comparison and simplified daily implementation, making it a practical solution for clinical proton therapy QA.