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Community approach for reducing small field measurement errors: Experience over 24 centres.

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This study established consistent small field dosimetry across 24 centers using the IBA Razor diode for Stereotactic Body Radiation Therapy (SBRT). It provides a method to detect and correct dosimetry errors, ensuring patient safety.

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Crowd knowledge methodMulticentre evaluationSilicon diode detectorSmall field output factor

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Modern Stereotactic Body Radiation Therapy (SBRT) demands rigorous quality assurance.
  • Accurate dosimetry in small radiation fields presents a significant challenge for radiotherapy centers.
  • Standard recommendations require detailed measurement procedures and cross-checks for small field dosimetry.

Purpose of the Study:

  • To minimize systematic errors in output factor measurements across multiple Italian radiotherapy centers.
  • To establish a standardized method for small field dosimetry using the IBA Razor silicon diode.
  • To ensure accurate dose delivery in Stereotactic Body Radiation Therapy.

Main Methods:

  • Involved 24 Italian radiotherapy centers.
  • Utilized the unshielded silicon diode IBA Razor.
  • Created reference curves for relative signal ratio (RSR) as a function of beam size for each Linac family.

Main Results:

  • Demonstrated consistency in small field dosimetry across all participating centers.
  • Enabled comparison of measurements among centers using the IBA Razor diode.
  • Identified critical issues in two centers' RSR measurements, potentially causing overdosage >5% if uncorrected.

Conclusions:

  • The proposed approach ensures consistent small field dosimetry, crucial for SBRT quality assurance.
  • Facilitates knowledge sharing between experienced and less experienced radiotherapy centers.
  • Crowd knowledge methods can be applied to enhance radiation dosimetry practices and implement new technologies effectively.