Related Experiment Video
Updated: Jun 26, 2025
06:06
High-Throughput Dissociation and Orthotopic Implantation of Breast Cancer Patient-Derived Xenografts
Published on: December 20, 2024
569
Seed distribution stability in permanent breast seed implant brachytherapy
Claire Zhang1, Cassidy Northway2, Juanita Crook3
1Department of Medical Physics, BC Cancer - Kelowna, Kelowna, British Columbia, Canada; Department of Computer Science, Mathematics, Physics and Statistics, The University of British Columbia Okanagan, Kelowna, British Columbia, Canada.
Brachytherapy
|May 9, 2024
Summary
Permanent breast seed implant (PBSI) brachytherapy shows seeds remain stable in breast tissue one month post-procedure. Dosimetry meets clinical goals, indicating effective treatment quality despite minor seed migration.
Area of Science:
- Oncology
- Medical Physics
- Radiotherapy
Background:
- Permanent breast seed implant (PBSI) brachytherapy is a treatment for breast cancer.
- Assessing seed stability and its impact on dosimetry is crucial for treatment efficacy.
Purpose of the Study:
- To quantitatively evaluate the stability of implanted seeds in PBSI brachytherapy.
- To assess the impact of seed migration on treatment quality and dosimetry.
Main Methods:
- Retrospective analysis of CT scans from 67 patients at Day 0 and Day 30 post-PBSI.
- Quantification of seed distribution using 90% isodose contour and seed spread.
- Comparison of dosimetry for target volumes and critical structures between Day 0 and Day 30.
Main Results:
- Seed distribution changed, with increased maximum spread observed by Day 30.
- The 90% isodose volume decreased over time.
- Target volume dosimetry parameters were lower on Day 30 but remained within clinical goals; critical structure doses were similar.
Conclusions:
- PBSI demonstrates acceptable seed stability in breast tissue up to 30 days post-procedure.
- The PBSI technique provides clinically effective dosimetry.
- This study offers evidence supporting the dosimetric efficacy of PBSI.
