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Time resolved dose rate distributions in brachytherapy.

Vasiliki Peppa1, Eleftherios P Pappas1, Pantelis Karaiskos1

  • 1Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens, Greece.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|May 2, 2017
PubMed
Summary

Time-resolved dose rate distributions (TR-DRD) are crucial for accurate pulsed-dose-rate (PDR) brachytherapy effectiveness. TR-DRD significantly impacts tumor control probability (TCP) calculations, especially with short tissue repair times.

Keywords:
BrachytherapyDose rateRadiobiology

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Brachytherapy, a localized radiation therapy, often uses pulsed-dose-rate (PDR) techniques.
  • Accurate estimation of biological effectiveness in PDR brachytherapy is critical for optimal treatment outcomes.
  • Traditional methods may not fully capture the complexities of dose delivery in PDR treatments.

Purpose of the Study:

  • To investigate the biological significance of incorporating time-resolved dose rate distributions (TR-DRD) in brachytherapy.
  • To compare the accuracy of TR-DRD-based calculations with traditional analytical methods for PDR brachytherapy.

Main Methods:

  • Calculated TR-DRD using Monte Carlo methods for a head and neck patient's PDR brachytherapy plan.
  • Determined Biologically Effective Dose (BED) using both analytical (mean dose rate per pulse) and numerical (TR-DRD) approaches.
  • Compared Tumor Control Probabilities (TCP) for various PDR schemes and tissue repair half-times.

Main Results:

  • The analytical method underestimated BED by up to 2% compared to TR-DRD.
  • TCP underestimation by the analytical method was influenced by dose per pulse, pulse duration, period time, and total dose.
  • Tissue repair half-time significantly impacted TCP, with differences up to 39.1% for shorter repair times.

Conclusions:

  • TR-DRD data are essential for precise biological effectiveness estimations in PDR brachytherapy, particularly for short tissue repair half-times.
  • The findings suggest TR-DRD integration is necessary for accurate TCP calculations in PDR treatments.
  • TR-DRD did not significantly alter dose prescription for equivalent high-dose-rate (HDR) schedules in mobile tongue carcinoma.