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Related Experiment Videos

Centralized multiinstitutional postimplant analysis for interstitial prostate brachytherapy

W S Bice1, B R Prestidge, P D Grimm

  • 1Radiation Oncology Service, Wilford Hall Medical Center, Lackland AFB, TX, USA.

International Journal of Radiation Oncology, Biology, Physics
|July 4, 1998
PubMed
Summary
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Centralized analysis of transperineal interstitial permanent prostate brachytherapy (TIPPB) is feasible. This pilot study shows it can effectively evaluate implant quality across institutions for multi-institutional trials.

Area of Science:

  • Radiation oncology
  • Medical physics
  • Urologic oncology

Background:

  • Transperineal interstitial permanent prostate brachytherapy (TIPPB) is a treatment for prostate cancer.
  • Standardizing quality assessment across multiple institutions is challenging.
  • A pilot study was designed to assess centralized analysis feasibility.

Purpose of the Study:

  • To investigate the feasibility and utility of centralized postimplant analysis for TIPPB.
  • To compare 125I implant results from five different institutions.
  • To establish a basis for multi-institutional trial quality control.

Main Methods:

  • Dose-volume histogram (DVH) analysis of 125I implants from five institutions.
  • Analysis included implanted activity, prostate volumes (ultrasound and CT), target-volume ratios, homogeneity, dose coverage, and rectal doses.

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  • Prostate contours were redrawn by a single physician to ensure consistent analysis.

    • Main Results:

    • Differences in TIPPB techniques were identified between institutions based on activity and volume.
    • Variability in CT-based prostate contouring was observed, but had minimal impact on dose coverage.
    • Rectal doses varied significantly, reflecting differences in implant techniques.

    Conclusions:

    • Centralized, outcome-based evaluation of TIPPB is viable and appropriate.
    • This approach can be effectively used in multi-institutional trials.
    • Centralized analysis enhances the reliability of efficacy studies for TIPPB.