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Reflectance-based determination of optical properties in highly attenuating tissue
T Joshua Pfefer1, L Stephanie Matchette, Carrie L Bennett
1US Food and Drug Administration, Center for Devices and Radiological Health, Rockville, Maryland 20857, USA. tjp@cdrh.fda.gov
Journal of Biomedical Optics
|April 10, 2003
Summary
This study developed a diffuse reflectance system for measuring tissue optical properties in the UVA-VIS range. The system achieved moderate accuracy, with potential for enhanced precision through further development.
Area of Science:
- Biomedical Optics
- Spectroscopy
- Tissue Optics
Background:
- Accurate in vivo tissue optical properties (UVA-VIS) are crucial for understanding light propagation and safety limits in biomedical applications.
- Current methods require further development for precise endoscopic measurements.
Purpose of the Study:
- To develop a diffuse reflectance system for endoscopic measurement of tissue optical properties.
- To establish accurate calibration models for determining optical properties in the UVA-VIS range.
Main Methods:
- Developed a diffuse reflectance system with <2.5 mm fiber separation.
- Generated reflectance datasets using Intralipid-dye phantoms and Monte Carlo simulations.
- Utilized artificial neural networks and partial least squares for multivariate calibration.
Main Results:
- Achieved root mean square errors of +/-2 cm(-1) for absorption and +/-3 cm(-1) for reduced scattering coefficients.
- Ex vivo bovine liver measurements showed 5-30% agreement with literature values.
- Neural network models with uniform optical property intervals demonstrated highest accuracy.
Conclusions:
- The developed diffuse reflectance technique is feasible for determining tissue optical properties.
- Moderate accuracy was achieved, with potential for improvement via system and algorithm modifications.