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CALIBRATION OF GAFCHROMIC EBT3 FILM FOR DOSIMETRY OF SCANNING PROTON PENCIL BEAM (PBS).

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Gafchromic EBT3 films offer precise 2D dose mapping in proton radiotherapy. An optimized protocol using AnalyseGafchromic software corrects film response for accurate clinical dose measurements.

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Area of Science:

  • Medical Physics
  • Radiotherapy Dosimetry

Background:

  • Gafchromic EBT3 films are utilized for 2D dose mapping in proton radiotherapy due to their sub-millimeter spatial resolution.
  • Accurate dose measurements are critical for clinical applications, necessitating correction of the film response.

Purpose of the Study:

  • To develop and validate an optimized protocol for evaluating Gafchromic EBT3 film response.
  • To implement corrections for film response using in-house software for enhanced dose accuracy.

Main Methods:

  • Utilized triple channel dose calibration, statistical scan-to-scan fluctuation analysis, and experimentally determined dose and LET dependence.
  • Developed and applied the AnalyseGafchromic software for analyzing and correcting Gafchromic EBT3 film response.
  • Applied the optimized protocol to determine dose profiles of a scanning therapy unit.

Main Results:

  • The developed protocol and software enable accurate correction of Gafchromic EBT3 film response.
  • The optimized evaluation method was successfully applied to measure large-area dose profiles.
  • Accurate 2D dose profiles were determined for a scanning therapy unit at CCB, Krakow.

Conclusions:

  • The optimized protocol provides a reliable method for accurate Gafchromic EBT3 film dosimetry in proton therapy.
  • AnalyseGafchromic software facilitates precise dose mapping essential for clinical radiotherapy.
  • This work contributes to improved quality assurance in proton beam therapy.