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Nonprostate Cancer Deaths Best Predict Long-Term Survival in Men Aged ≤59 Years Treated With Low Dose Rate Brachytherapy With or Without Supplemental Therapies: A Mandate for Health Enhancement.

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Multisector prostate dosimetric quality: analysis of a large community database.

Gregory S Merrick1, Wayne M Butler1, Peter Grimm2

  • 1Department of Radiation Oncology, Schiffler Cancer Center & Wheeling Jesuit University, Wheeling, WV.

Brachytherapy
|September 19, 2013
PubMed
Summary

Prostate brachytherapy shows inferior dosimetric quality in anterior and base sectors. Further critique of planning and technique is needed to improve coverage and minimize dosimetric differences in these areas.

Keywords:
BrachytherapyDosimetryImplant qualityProstate cancer

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Area of Science:

  • Oncology
  • Medical Physics
  • Radiotherapy

Background:

  • Prostate brachytherapy is a common treatment for localized prostate cancer.
  • Multi-institutional studies are crucial for evaluating the quality and consistency of radiotherapy techniques.
  • Dosimetric quality assessment is essential for optimizing treatment outcomes and minimizing side effects.

Purpose of the Study:

  • To evaluate the multi-institutional prostate brachytherapy dosimetric quality.
  • To analyze dosimetric quality using a novel multisector approach.
  • To compare dosimetric quality across different radionuclides used in prostate brachytherapy.

Main Methods:

  • Retrospective analysis of 4547 prostate brachytherapy implants (I-125, Pd-103, Cs-131).
  • Dosimetry recalculated after segmenting the prostate into 12 sectors (anterior, lateral, posterior, base, midgland, apex).
  • Comparison of dosimetric parameters (V100, D90) across sectors and radionuclides.

Main Results:

  • 33.0% of base sectors, 4.6% of midgland sectors, and 10.5% of apical sectors had minimal dosimetric quality (V100 < 80%).
  • Anterior sectors showed notably inferior coverage (e.g., 59.2% of anterior base sectors were minimal).
  • Lateral and posterior sectors demonstrated excellent or standard quality in most cases; no significant dosimetric differences were found between I-125 and Pd-103.

Conclusions:

  • Prostate brachytherapy planning and intraoperative techniques require further critique.
  • Inferior coverage in anterior and base sectors necessitates targeted improvements.
  • Minimizing dosimetric differences across sectors is crucial for optimizing treatment efficacy.