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Intraoperative factors associated with stranded source placement accuracy in low-dose-rate prostate brachytherapy.
M F Jamaluddin1, S Ghosh1, M P Waine2
1Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.
Brachytherapy
|February 14, 2017
Summary
Lower needle insertion speed during low-dose rate prostate brachytherapy is linked to reduced radioactive seed misplacement. This finding helps improve treatment accuracy for prostate cancer patients.
Area of Science:
- Oncology
- Medical Physics
- Urology
Background:
- Accurate radioactive seed placement is crucial for effective low-dose rate (LDR) prostate brachytherapy.
- Intraoperative factors can influence the precision of source delivery during the procedure.
Purpose of the Study:
- To investigate intraoperative factors contributing to radioactive seed misplacement in LDR prostate brachytherapy.
- To identify specific needle insertion parameters associated with improved source placement accuracy.
Main Methods:
- Video analysis of needle insertions during brachytherapy procedures to determine maximum and average velocities.
- Recording of needle insertion attempts and manual manipulation.
- Ultrasound-based analysis of radioactive seed (Iodine-125) misplacement.
Main Results:
- A maximum needle insertion velocity below 12 cm/s was statistically associated with decreased seed misplacement (p=0.0121).
- The mean overall seed misplacement was 0.49 cm.
- Factors such as average needle speed, manual needle manipulation, and the number of needle passes did not show a significant correlation with seed misplacement.
Conclusions:
- Slower maximum needle insertion velocity is a key factor in reducing seed misplacement during prostate brachytherapy.
- Optimizing needle insertion speed can enhance the precision of LDR prostate brachytherapy implants.
