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Field output factors for small fields: A large multicentre study.

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Summary
This summary is machine-generated.

This study collected small field output factors for stereotactic radiotherapy (SRT) using various detectors and equipment. The findings provide crucial data to minimize errors in SRT implementation.

Keywords:
IAEA TRS-483Output factorsSmall field dosimetry

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Accurate output factor determination is vital for stereotactic radiotherapy (SRT).
  • Small field dosimetry presents unique challenges in clinical implementation.
  • A working group from the French medical physicist society (SFPM) addressed these challenges.

Purpose of the Study:

  • To gather and disseminate small field output factors for various clinical SRT equipment.
  • To analyze data based on different detectors and measurement configurations.
  • To establish a reliable dataset for SRT implementation.

Main Methods:

  • A survey collected data on SRT equipment, measurement conditions, and detectors used.
  • Participants reported output factors and correction factors per IAEA TRS-483.
  • Mean output factors and standard deviations were calculated for data from at least 3 linacs.

Main Results:

  • Data from 23 centers were analyzed.
  • Standard deviations were <1.5% for fields ≥1 cm and reached 5% for 0.5 cm fields.
  • Deviations from published data were <2%, except for a specific CyberKnife collimator (3.5%).

Conclusions:

  • The multicenter study provides validated output factor values for SRT.
  • These values serve as external cross-verification for new SRT programs.
  • The data aims to minimize systematic errors in small field dosimetry.