Integrated light dosimetry system for prostate photodynamic therapy.

Area of Science:

• Biomedical Engineering
• Medical Physics
• Oncology

Background:

• Prostate cancer treatment often requires precise light delivery for photodynamic therapy (PDT).
• Accurate dosimetry is crucial for ensuring uniform light distribution and therapeutic efficacy.
• Heterogeneity in prostate tissue optical properties complicates treatment planning.

Purpose of the Study:

• To develop and validate a comprehensive light dosimetry system for prostate PDT.
• To optimize light delivery for uniform dose coverage in heterogeneous prostate tissue.
• To enable real-time measurement and control of light fluence rates during treatment.

Main Methods:

• Developed a kernel algorithm for rapid 3D light fluence rate calculation, accounting for optical heterogeneity.
• Implemented a Cimmino optimization algorithm to optimize cylindrical diffusing fiber parameters for uniform dose.
• Designed a 12-channel light delivery system with individually controlled motorized attenuators.
• Integrated an in vivo light fluence rate measurement system.

Main Results:

• The light fluence rate calculation demonstrated speed and accuracy comparable to finite-element methods.
• Optimizing cylindrical diffusing fibers improved light fluence rate prediction accuracy.
• The system allows for real-time adjustment of light source intensities.
• The integrated system provides comprehensive dosimetry for prostate PDT.

Conclusions:

• The developed dosimetry system is effective for prostate PDT planning and delivery.
• Real-time control and accurate fluence rate calculation enhance treatment precision.
• The system's integration of key components makes it suitable for clinical application in prostate PDT.