Overcoming pubic arch interference with free-hand needle placement in men undergoing prostate brachytherapy

Area of Science:

• Radiation Oncology
• Medical Physics
• Urology

Background:

• Prostate brachytherapy is a common treatment for localized prostate cancer.
• Pubic arch interference can complicate needle placement during the procedure.
• Free-hand needle placement is an alternative technique to navigate anatomical challenges.

Purpose of the Study:

• To evaluate the effectiveness of postimplant dosimetry when free-hand needles are used.
• To compare dosimetry outcomes in patients requiring free-hand needle placement versus those who do not.

Main Methods:

• Retrospective review of prostate brachytherapy patients treated between 2001 and 2006.
• Comparison of postimplant dosimetry parameters (D(90), V(100), V(150), rectal V(100)) between two patient groups.
• Analysis of free-hand needle usage in relation to pubic arch interference.

Main Results:

• Eight out of 145 patients required free-hand needle placement due to pubic arch interference.
• The free-hand cohort had a larger mean prostate volume (46.0cc) compared to the standard group (39.7cc).
• Dosimetry outcomes, including D(90) and V(100), were comparable between the free-hand and standard groups, with no significant difference in rectal V(100).

Conclusions:

• Free-hand needle placement is a viable technique for prostate brachytherapy when pubic arch interference is present.
• This method allows for adequate postimplant dosimetry, ensuring treatment efficacy.
• The study supports the use of free-hand needles to overcome anatomical limitations in prostate brachytherapy.