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Technical Note: An efficient daily QA procedure for proton pencil beam scanning.

James E Younkin1, Jiajian Shen1, Martin Bues1

  • 1Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, 85259, USA.

Medical Physics
|February 3, 2018
PubMed
Summary

A new daily quality assurance (QA) program for pencil beam scanning (PBS) proton therapy uses a single field for efficient testing. This method achieves strict tolerances comparable to commissioning standards, enhancing treatment safety.

Keywords:
PBSdaily QAproton therapyquality assurancesingle field

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Pencil beam scanning (PBS) proton therapy requires rigorous daily quality assurance (QA) to ensure treatment accuracy and patient safety.
  • Current QA protocols can be time-consuming and may not always achieve the necessary precision for advanced techniques.

Purpose of the Study:

  • To develop and validate an efficient daily QA program for PBS proton radiotherapy.
  • To implement simultaneous dosimetric testing using a single, nonuniform field with strict tolerance levels.

Main Methods:

  • A nonuniform field was designed for delivery on a Sun Nuclear Daily-QA 3 device, measuring beam output, proton range, and spot position.
  • A custom acrylic block enabled simultaneous measurement of proton ranges and beam output.
  • Sensitivities and reproducibility were assessed to quantify device response and ensure QA procedure robustness.

Main Results:

  • Established strict daily tolerances: 1% for output, 0.5 mm for range, and 1.5 mm for spot position.
  • The automated procedure reduced daily QA time to 10 minutes per treatment room.
  • Minimized beam competition issues in multi-room facilities.

Conclusions:

  • An efficient daily QA procedure for PBS proton therapy is feasible using a single, nonuniform field on a standard QA device.
  • Quantifying device response and controlling uncertainties allowed daily tolerances to meet commissioning standards.
  • This streamlined QA enhances safety and efficiency in proton radiotherapy delivery.