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Related Experiment Videos

Proton dosimetry intercomparison based on the ICRU report 59 protocol.

S Vatnitsky1, M Moyers, D Miller

  • 1Loma Linda University Medical Center, California, USA.

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
|August 6, 1999
PubMed
Summary
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An international proton dosimetry intercomparison found that using the new International Commission on Radiation Units and Measurements (ICRU) report 59 protocol ensures patient absorbed dose consistency within +/-0.9%. This protocol is recommended for clinical proton beam calibration.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • The International Commission on Radiation Units and Measurements (ICRU) established a new proton beam calibration protocol in report 59.
  • An international proton dosimetry intercomparison was conducted to assess this new protocol.

Purpose of the Study:

  • To estimate the consistency of patient absorbed dose when using the ICRU report 59 protocol.
  • To evaluate dose determination differences arising from various 60Co-based ionization chamber calibration factors.

Main Methods:

  • Eleven institutions participated in the intercomparison.
  • Measurements were performed in a polystyrene phantom using a 155 MeV proton beam.
  • Ionization chambers with different calibration types (exposure, air kerma, absorbed dose-to-water) were used.
Keywords:
Non-programmatic

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Main Results:

  • Adherence to the ICRU report 59 protocol resulted in absorbed doses within +/-0.9% (one standard deviation).
  • The maximum difference in determined doses among participants was 2.9%.
  • Differences in proton dose depended on ionization chamber type and calibration method.

Conclusions:

  • The ICRU report 59 protocol, with traceable 60Co calibration factors, achieves proton absorbed dose distributions with less than 3% difference.
  • Clinical proton beam calibration should adopt the ICRU report 59 protocol.
  • Observed dose differences are not solely attributable to variations in 60Co calibration factors.