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Extraprostatic seed placement and its effect on seed loss.
Elena Nedea1, Kent Wallner, Daniel Reed
1Department of Radiation Oncology, McGill University, Montreal, Quebec, Canada.
Cancer Journal (Sudbury, Mass.)
|June 23, 2005
Summary
Extraprostatic seed placement in brachytherapy does not significantly increase seed loss. Advanced imaging like CT and MR confirm this finding, ensuring treatment accuracy and patient safety.
Area of Science:
- Urology
- Radiation Oncology
- Medical Imaging
Background:
- Prostate brachytherapy involves implanting radioactive seeds for cancer treatment.
- Accurate seed placement is crucial for effective radiation delivery and minimizing side effects.
- Extraprostatic seed migration can occur, but its impact on seed loss is not fully understood.
Purpose of the Study:
- To investigate the relationship between extraprostatic seed placement and subsequent seed loss.
- To evaluate the utility of computed tomographic (CT) and magnetic resonance (MR) imaging in assessing seed migration post-brachytherapy.
Main Methods:
- Twenty-two patients with T1-T2 prostate cancer received Iodine-125 (I-125) brachytherapy.
- Patients underwent CT and MR scans on day 0 (post-implantation) and day 30.
- Seed localization and counting were performed using plain radiographs, CT, and MR imaging to determine extraprostatic seeds and seed loss.
Main Results:
- Extraprostatic seeds ranged from 17% to 48% of the total implanted seeds.
- Ten out of 22 patients experienced seed loss between day 0 and day 30 (mean loss: 1.1 seeds).
- No significant correlation was found between the percentage of extraprostatic seeds and the number of seeds lost.
Conclusions:
- Extraprostatic seed placement, as assessed by CT and MR imaging, does not substantially increase the risk of seed loss after brachytherapy.
- Advanced imaging techniques provide reliable seed localization and aid in understanding seed migration patterns.