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Optimized Cylindrical Diffuser Powers for Interstitial PDT Breast Cancer Treatment Planning: A Simulation Study.

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Optimizing cylindrical diffusing optical fibers (CDFs) power ensures effective light dose delivery for interstitial photodynamic therapy (iPDT) in large tumors. This study optimizes CDF output for precise iPDT dosimetry in breast tumors.

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Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Oncology

Background:

  • Interstitial photodynamic therapy (iPDT) requires precise dose delivery for large tumors.
  • Minimizing damage to surrounding healthy tissue is crucial in iPDT.
  • Cylindrical diffusing optical fibers (CDFs) are utilized as light sources in clinical iPDT.

Purpose of the Study:

  • To optimize the output power of CDFs for delivering a prescribed light dose to spherical tumor volumes.
  • To ensure efficient therapeutic dose delivery while minimizing damage to adjacent healthy tissues.
  • To develop a dosimetry system for measuring and controlling optical dose in breast tumors.

Main Methods:

  • Simulated the use of four CDFs placed vertically within a tumor.
  • Calculated fluence rate using the diffusion equation with specified optical properties of breast tumor tissue (μa = 0.085 cm⁻¹, μs' = 16 cm⁻¹).
  • Calculated dose delivery over a treatment time of 150 seconds for a target dose of 20-50 J·cm⁻².

Main Results:

  • Four CDFs delivered the target dose to over 90% of a 3 cm diameter tumor volume.
  • Dose delivery decreased to approximately 67% in larger tumor nodes.
  • Utilizing five CDFs improved the dose delivery ratio by over 10% in larger nodes.

Conclusions:

  • Optimized power distribution from CDFs allows for uniform therapeutic dose delivery.
  • This simulation is a key step in developing a dosimetry system for iPDT in breast cancer.
  • The findings support precise light dose management for improved iPDT outcomes.