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Image-guided high dose rate endorectal brachytherapy.

Slobodan Devic1, Té Vuong, Belal Moftah

  • 1Department of Medical Physics, McGill University Health Centre, Montréal, Québec, H3G 1A4, Canada. devic@medphys.mcgill.ca

Medical Physics
|December 13, 2007
PubMed
Summary

Fractionated high dose rate endorectal brachytherapy (HDR-EBT) ensures accurate rectal cancer treatment. Image guidance procedures maintain daily dose consistency, crucial for successful preoperative therapy.

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Area of Science:

  • Oncology
  • Medical Physics
  • Radiotherapy

Background:

  • Advanced rectal adenocarcinomas require preoperative treatment for downsizing and downstaging.
  • Fractionated high dose rate endorectal brachytherapy (HDR-EBT) offers an alternative therapeutic approach.
  • Accurate dose delivery is essential for the efficacy of fractionated brachytherapy.

Purpose of the Study:

  • To present an image guidance procedure for ensuring daily dose reproducibility in fractionated HDR-EBT.
  • To develop and illustrate methods for applicator rotational alignment and longitudinal dwell position shifts.
  • To assess the impact of applicator shifts on treatment delivery in a clinical cohort.

Main Methods:

  • CT-based treatment planning for HDR-EBT.
  • Development of an image guidance procedure comparing daily radiographs with digitally reconstructed radiographs (DRRs).

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  • Determination of necessary applicator shifts (rotational and longitudinal) for daily treatment fractions.
  • Assessment of longitudinal applicator shift impact in 62 patients.

    • Main Results:

    • A procedure was developed to ensure daily dose reproducibility for fractionated HDR-EBT.
    • Methods for applicator rotational alignment and longitudinal dwell position shifts were described and illustrated.
    • The impact of longitudinal applicator shifts on treatment delivery was assessed in a patient cohort.

    Conclusions:

    • Daily dose reproducibility is crucial for successful fractionated 3D brachytherapy.
    • Image guidance procedures involving applicator adjustments are necessary for precise HDR-EBT.
    • The presented methods aid in achieving accurate dose distribution in preoperative rectal cancer brachytherapy.