4D Brachytherapy, a novel real-time prostate brachytherapy technique using stranded and loose seeds

Area of Science:

• Urology
• Radiation Oncology
• Medical Physics

Background:

• Brachytherapy is a common treatment for prostate cancer.
• Existing techniques include two-stage and real-time methods with loose seeds.
• There is a need for more efficient and effective brachytherapy procedures.

Purpose of the Study:

• To describe the development and evaluate the efficacy of a new one-stage prostate brachytherapy technique called 4D Brachytherapy.
• To compare 4D Brachytherapy with the established Seattle technique in terms of efficiency, dosimetry, and clinical outcomes.

Main Methods:

• Development of a novel one-stage prostate brachytherapy technique (4D Brachytherapy) using a combination of stranded and loose seeds.
• Utilized a nomogram based on over 1000 procedures to pre-calculate seed requirements.
• Prospectively collected data comparing 4D Brachytherapy with the Seattle technique.

Main Results:

• 4D Brachytherapy demonstrated significantly improved dosimetry, with higher median D(90) and V(100) values compared to the Seattle technique.
• Reduced short-term urinary morbidity was observed in the 4D Brachytherapy group, as measured by the International Prostate Symptom Score (IPSS).
• The new technique resulted in more efficient operating room time due to pre-ordering and loading of seeds.

Conclusions:

• 4D Brachytherapy is a time-efficient, one-stage prostate brachytherapy technique with superior dosimetry and reduced urinary morbidity.
• The combination of stranded and loose seeds in 4D Brachytherapy may mitigate seed migration risks while optimizing dose distribution.
• This novel technique offers a promising advancement in prostate brachytherapy.