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An interstitial light assembly for photodynamic therapy in prostatic carcinoma
L K Lee1, C Whitehurst, M L Pantelides
1Laser Oncology Programme, CRC Department of Experimental Radiation Oncology, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester, UK.
BJU International
|October 26, 1999
Summary
This study developed a multi-fiber laser system for photodynamic therapy (PDT) in prostate cancer treatment. The system achieved precise fiber placement but faced challenges with light delivery variations due to hemorrhage.
Area of Science:
- Oncology
- Biomedical Engineering
- Medical Physics
Background:
- Photodynamic therapy (PDT) is a promising cancer treatment modality.
- Effective light delivery is crucial for successful PDT outcomes.
- Prostate cancer treatment requires precise interstitial light delivery.
Purpose of the Study:
- To develop and evaluate a novel interstitial laser light delivery system for prostate cancer photodynamic therapy.
- To assess the feasibility of using multiple optical fibers for simultaneous light delivery.
- To investigate light penetration and attenuation in prostate tissue during in vivo PDT.
Main Methods:
- A 1x4 fiber splitter divided laser light for simultaneous delivery via four optical diffusers.
- Biplanar transrectal ultrasonography (TRUS) and a template guided percutaneous fiber placement.
- In vivo light fluence rates and penetration depth (1/micro[eff]) were measured in seven patients.
Main Results:
- The effective light attenuation coefficient (micro[eff]) in prostate tissue was determined.
- Significant variations (up to 10-fold) in light levels were observed between patients.
- Prostate stabilization ensured precise optical fiber positioning (within 2 mm).
Conclusions:
- The developed system is suitable for clinical PDT and in vivo light penetration studies.
- Hemorrhage around the optical diffusers presents a significant challenge affecting light delivery consistency.
- Further optimization is needed to address light delivery variability caused by intra-procedural bleeding.