Overlapped seed localization in seed implant brachytherapy

Area of Science:

• Medical Physics
• Radiotherapy Imaging
• Image Processing

Background:

• Accurate localization of prostate implant seeds is crucial for effective permanent prostate brachytherapy.
• Overlapping seeds in projection views pose a challenge for precise 3D positioning.
• Existing methods may struggle with determining the exact location of multiple, superimposed seeds.

Purpose of the Study:

• To develop and validate a novel procedure for determining the location of wholly overlapped prostate implant seeds.
• To assess the efficacy of an in-house developed localization software utilizing a three-film technique.
• To enhance quality assurance protocols in permanent prostate brachytherapy.

Main Methods:

• Development of a procedure involving image processing and specialized localization software.
• Utilizing a three-film technique with images from anterior-posterior and oblique angles.
• Testing the software with a simulation phantom and performing nine simulation sets to evaluate seed separation.

Main Results:

• The developed software successfully separates wholly overlapped seeds by calculating inter-seed distances across multiple projections.
• The procedure demonstrated efficacy in locating seeds even when multiple seeds were overlapped in all projection images.
• Image processing techniques were applied to enhance imaging quality and remove background noise.

Conclusions:

• The developed procedure and software provide a reliable method for localizing overlapped prostate brachytherapy seeds.
• This technique offers valuable information for improving quality assurance in permanent prostate brachytherapy.
• The approach addresses a significant challenge in post-implant seed localization.