Related Experiment Video
Updated: Apr 8, 2026
05:19
A New Technique for Treating Low-risk Prostate Cancer—Super Active Surveillance
Published on: November 7, 2025
1.1K
Sector analysis provides additional spatial information on the permanent prostate brachytherapy learning curve.
Ahamed Badusha Mohamed Yoosuf1, Darren M Mitchell2, Geraldine Workman1
1Department of Radiotherapy Medical Physics, Northern Ireland Cancer Centre, Belfast City Hospital, Belfast, Antrim, Northern Ireland, UK.
Brachytherapy
|July 1, 2015
Summary
Sector analysis reveals improvements in permanent prostate brachytherapy dosimetry with experience. This detailed approach correlates with better urinary outcomes and rectal dose, unlike global analysis alone.
Area of Science:
- Urology
- Radiation Oncology
- Medical Physics
Background:
- Permanent prostate brachytherapy (PPB) is a common treatment for localized prostate cancer.
- Evaluating the learning curve in PPB is crucial for optimizing treatment outcomes.
- Multisector dosimetric analysis offers a more granular assessment of treatment quality.
Purpose of the Study:
- To assess the learning curve of permanent prostate brachytherapy (PPB) using postimplant multisector dosimetry.
- To determine the correlation between sector-specific dosimetry and patient-reported outcome measures (PROMs).
Main Methods:
- Analysis of the first 200 patients treated with Iodine-125 PPB monotherapy (145 Gy).
- Postimplant dosimetry (PID) evaluated global and 12 prostate sectors for D90 (minimum dose to 90% of prostate).
- Correlation of global and sector PID with urinary and bowel PROMs (International Prostate Symptom Score, Expanded Prostate Cancer Index Composite).
Main Results:
- Significant improvement in global D90 with case number (0.11 Gy/case).
- Base sectors showed improved D90 mirroring global trends; midgland and apex sectors differed significantly.
- Posterior midgland sectors showed reduced D90 with experience and correlated with urinary symptom changes (International Prostate Symptom Score), unlike global D90 analysis.
Conclusions:
- Multisector analysis provides enhanced spatial insights into the PPB learning curve.
- Sector-specific dosimetry correlates with urinary PROMs and rectal dose, offering a more refined assessment than global dosimetry.
