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Prostate brachytherapy post-implant dosimetry: a comparison between higher and lower source density.

Carys W Thomas1, Alexandra Kruk, Colleen E McGahan

  • 1Department of Radiation Oncology, British Columbia Cancer Agency, Vancouver, BC, Canada. carysthomas@doctors.org.uk

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
|March 21, 2007
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Post-implant dosimetry for prostate brachytherapy showed no significant differences between low density source implants (LDI) and high density source implants (HDI). This indicates that using higher strength Iodine-125 sources is cost-effective without compromising treatment quality.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Urologic Oncology

Background:

  • Prostate brachytherapy utilizes radioactive seeds to deliver radiation.
  • Source density (low density implant [LDI] vs. high density implant [HDI]) may impact treatment dosimetry.
  • Iodine-125 is a commonly used isotope for prostate brachytherapy.

Purpose of the Study:

  • To compare post-implant dosimetry between LDI and HDI in prostate brachytherapy.
  • To evaluate the impact of source density on dose distribution and coverage.
  • To determine if LDI or HDI offers dosimetric advantages.

Main Methods:

  • Dosimetric analysis of 39 LDI and 39 volume-matched HDI prostate brachytherapy cases.
  • Evaluation of whole prostate, prostate quadrants, rectum, and urethra dosimetric parameters.
  • Utilized Iodine-125 sources with differing prescribed doses (115 Gy for LDI, 144 Gy for HDI).
  • Repeated measures analysis of variance for statistical comparison.

Main Results:

  • No significant differences in whole prostate volume between LDI and HDI groups.
  • Identical post-implant dosimetric parameters for whole prostate, quadrants, urethra, and rectum.
  • No significant variation in V200, V150, V100, D90, D80, or external index.

Conclusions:

  • Iodine-125 LDI and HDI demonstrate equivalent post-implant dosimetry.
  • Lower source density does not compromise dose homogeneity or conformality.
  • Higher strength sources offer potential for cost savings and reduced morbidity in prostate brachytherapy.