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Determining optimal spot delivery pattern using log file Derived dose discrepancy factor in pencil beam scanning

Kah Seng Lew1, Calvin Wei Yang Koh2, Kang Hao Lee2

  • 1Division of Radiation Oncology, National Cancer Centre Singapore, Singapore; Division of Physics and Applied Physics, Nanyang Technological University, Singapore.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
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Optimizing pencil beam scanning delivery patterns minimizes dose discrepancies in reference dosimetry. A log file analysis identified the Y fast scan (50MU) as the most optimal pattern for accurate measurements.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Spatial uncertainties in spot positioning during reference dosimetry measurements of pencil beam scanning systems cause fluctuations in the reference dosimetry curve.
  • Accurate reference dosimetry is crucial for ensuring effective and safe radiation therapy.

Purpose of the Study:

  • To develop a method for determining the optimal delivery pattern for reference dosimetry measurements.
  • To quantify the expected dose discrepancy caused by spot positioning errors using log file information.

Main Methods:

  • Delivered 7 different delivery patterns five times each, collecting log files for each delivery.
  • Introduced a dose discrepancy factor (DDF) calculated using a pencil beam algorithm and actual spot positions from log files.
  • Quantified Type A and B uncertainties of DDF to identify the most optimal delivery pattern.

Main Results:

  • Relative dose differences of up to 2% were observed with certain delivery patterns.
  • A moderate correlation (R²=0.56) was found between DDF and measured dose ratio.
  • Delivery patterns with repainting and X fast scan (50MU) showed the lowest average uncertainty, while Y fast scan (50MU) was identified as the most optimal pattern with the least discrepancy.

Conclusions:

  • Delivery patterns significantly impact reference dosimetry measurements.
  • A log file-based approach can determine optimal delivery patterns to minimize spot positioning errors.
  • This method enhances the accuracy and reliability of reference dosimetry in pencil beam scanning systems.