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Radiochromic film dosimetry for prostate cancer radiotherapy requires careful evaluation. The Rcor and RGB methods, combined with specific scanners, yield the highest gamma analysis passing rates for dose verification.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Dosimetry

Background:

  • Radiochromic films are utilized for verifying dose distributions in radiotherapy.
  • Accurate dose verification is crucial for effective prostate cancer treatment planning.

Purpose of the Study:

  • To compare three distinct evaluation techniques for dose distributions using radiochromic EBT3 films in prostate cancer treatment plans.
  • To assess the impact of scanner models on gamma analysis passing rates.
  • To compare film measurements with MatriXX detector measurements.

Main Methods:

  • Evaluation of dose distributions using three techniques: R (red channel only), Rcor (corrected red channel), and RGB (multichannel in FilmQA software).
  • Digitization of radiochromic EBT3 films using Epson V750 and Epson 11000XL scanners.
  • Gamma analysis comparing calculated and measured dose distributions.

Main Results:

  • Gamma analysis passing rates are significantly influenced by the chosen evaluation technique and scanner model.
  • The Rcor technique with an Epson V750 scanner and the RGB technique with an Epson 11000XL scanner demonstrated the highest gamma passing rates.
  • Discrepancies were observed between film and MatriXX measurements, highlighting the importance of the evaluation method.

Conclusions:

  • The selection of an appropriate evaluation technique and scanner is critical for accurate dose verification in radiotherapy using radiochromic films.
  • The Rcor and RGB methods offer improved accuracy for dose distribution verification in prostate cancer treatment planning compared to the R method.
  • Further investigation into scanner-specific corrections and inter-detector comparisons is warranted.