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Quantifying radiotherapy beam quality: an analysis using gamma passing rates.

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Gradient Power Ratio (GPR) analysis offers a more sensitive method for machine quality assurance (QA) in accelerators compared to traditional techniques. This advanced approach provides better insights into accelerator beam status and radiation quality.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Accelerator Physics

Background:

  • Percentage Depth Dose (PDD) and profile curves are essential for evaluating accelerator beam quality and energy stability.
  • Traditional methods for machine Quality Assurance (QA) may not capture subtle variations in dose outputs.

Purpose of the Study:

  • To evaluate the effectiveness of Gradient Power Ratio (GPR) analysis for machine QA.
  • To compare GPR analysis with traditional methods for assessing accelerator dose outputs.

Main Methods:

  • GPRs were used to analyze 1D and 2D Profile metrics and PDD data against commissioning data from water tank ASCII files.
  • A 10% lower percentage dose cutoff was applied for GPR calculations.
  • A 1%/1 mm criterion was adopted for both 1D and 2D GPR analyses, with comparisons made to traditional QA checks.

Main Results:

  • GPR analysis demonstrated superior capability in comprehensive data analysis over traditional methods.
  • 1D curve passing rates (γ ≤ 1) were 96.19%, 100%, and 93.46%.
  • The 2D PDD image passing rate was 99.57%, revealing significant dose differences at the open field corners.

Conclusions:

  • GPRs are more sensitive to subtle data changes than traditional methods, offering valuable insights into accelerator beam status.
  • GPR analysis enhances the precision of machine QA in radiation therapy.