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Related Experiment Videos

Rectal-wall dose dependence on postplan timing after permanent-seed prostate brachytherapy.

Daniel Taussky1, Ivan Yeung, Theresa Williams

  • 1Department of Radiation Oncology, Princess Margaret Hospital, Toronto, Canada.

International Journal of Radiation Oncology, Biology, Physics
|March 28, 2006
PubMed
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Rectal wall dose after permanent seed prostate brachytherapy increases significantly over time due to resolving edema. This finding is crucial for accurate dose reporting and minimizing toxicity in radiation oncology.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Urology

Background:

  • Permanent seed prostate brachytherapy delivers radiation directly to the prostate using radioactive seeds.
  • The anterior rectal wall is a critical organ at risk for radiation-induced toxicity.
  • Postimplant periprostatic edema can influence the radiation dose delivered to the rectal wall.

Purpose of the Study:

  • To analyze the effect of postimplant timing on the radiation dose delivered to the anterior rectal wall.
  • To investigate the relationship between periprostatic edema resolution and rectal wall dose.
  • To determine if the timing of dosimetry assessment impacts reported rectal wall dose after prostate brachytherapy.

Main Methods:

  • Twenty patients undergoing permanent seed 125I brachytherapy (145 Gy) were studied.

Related Experiment Videos

  • Transrectal ultrasound (TRUS) was used for preimplant planning.
  • Postimplant dosimetry was assessed using MRI-CT fusion on Days 1, 8, and 30, reporting anterior rectal wall dose as isodose volumes (RD [1 cc], RD [2 cc]) and RV100.

    • Main Results:

    • Rectal wall radiation dose increased progressively from Day 1 to Day 30 post-implantation.
    • The median increase in dose to 1.0 cc of rectal wall (RD [1 cc]) was 39.2 Gy (p < 0.001).
    • The volume of rectal wall receiving 100% of the prescription dose (RV100) increased from 0.07 cc to 0.67 cc over 30 days; time of evaluation was the most significant predictor (p < 0.001).

    Conclusions:

    • The radiation dose to the anterior rectal wall significantly increases over time as prostatic and periprostatic edema resolve.
    • Current postimplant imaging methods do not quantify periprostatic edema.
    • Critical organ dose reporting and toxicity minimization guidelines must consider the timing of dose assessment in permanent seed prostate brachytherapy.