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Related Experiment Videos

Rectal dosimetric analysis following prostate brachytherapy.

G S Merrick1, W M Butler, A T Dorsey

  • 1Schiffler Oncology Center, Wheeling Hospital, WV 26003, USA. oncology@hgo.net

International Journal of Radiation Oncology, Biology, Physics
|April 7, 1999
PubMed
Summary
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Maintaining anterior rectal mucosa dose averages around 85% in prostate brachytherapy minimizes rectal complications. This approach, with maximal doses around 120%, results in about 9% mild proctitis and no rectal ulcerations.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Urology

Background:

  • Prostate brachytherapy involves implanting radioactive seeds to treat prostate cancer.
  • Assessing rectal tolerance dose is crucial for minimizing treatment-related toxicity.
  • Transperineal ultrasound-guided brachytherapy is a common technique for seed placement.

Purpose of the Study:

  • To retrospectively evaluate rectal tolerance dose in transperineal ultrasound-guided prostate brachytherapy.
  • To correlate rectal mucosal dose parameters with treatment outcomes.
  • To establish dose-response relationships for rectal complications.

Main Methods:

  • Retrospective analysis of 45 patients undergoing prostate seed implantation (125I or 103Pd).
  • Computed tomography (CT)-based dosimetry performed within 9 days post-implant.

Related Experiment Videos

  • Evaluation of anterior rectal mucosal dose (average, maximal, minimal), surface area, and length irradiated at various dose levels.
  • Rectal complications assessed via patient reporting and follow-up (19-28 months).

    • Main Results:

    • Average anterior rectal mucosal dose was 82.5% ± 14.1% of the prescribed minimal peripheral dose (mPD).
    • Average maximal rectal mucosal dose was 120% ± 35% of mPD.
    • Mild, self-limited proctitis occurred in 4 patients (approx. 9%), with dose parameters correlating to complication occurrence.
    • Rectal surface area and length irradiated showed strong correlation (r² = 0.82-0.93).

    Conclusions:

    • Maintaining anterior rectal mucosa point dose averages around 85% of the prescribed dose is associated with a low incidence of rectal complications.
    • Average maximal rectal mucosal dose up to 120% of mPD and specific irradiated rectal lengths (approx. 10mm at 100% mPD, 5mm at 120% mPD) appear safe.
    • This approach leads to approximately 9% mild proctitis, with no rectal ulceration or fistula formation observed.