Pre- and post-implant dosimetry: an inter-comparison between UK prostate brachytherapy centres

Area of Science:

• Urology
• Radiation Oncology
• Medical Physics

Background:

• Prostate brachytherapy involves precise radioactive seed placement.
• Dosimetry, measuring radiation dose, is crucial for treatment effectiveness and safety.
• Evaluating consistency across treatment centers is vital for quality assurance.

Purpose of the Study:

• To assess the consistency and reliability of pre- and post-implant dosimetry procedures.
• To identify variations in prostate brachytherapy practices among different centers.

Main Methods:

• Evaluation of dosimetry data from five prostate brachytherapy centers.
• Comparison of ultrasound-based pre-planning protocols.
• Analysis of computed tomography-based post-implant dosimetry techniques.

Main Results:

• Pre-implant planning protocols and techniques were largely consistent across centers.
• Ultrasound-based pre-planning showed minor variations potentially linked to seed activity.
• Significant variability was observed in post-implant dosimetry due to differing prostate volume estimations.

Conclusions:

• While pre-implant dosimetry is consistent, post-implant assessments require standardization.
• Standardizing prostate volume estimation in post-implant dosimetry is essential for reliable brachytherapy quality assurance.