Comparison of spatially and temporally resolved diffuse-reflectance measurement systems for determination of biomedical optical properties
Författare
Summary, in English
Time-resolved and spatially resolved measurements of the diffuse reflectance from biological tissue are two well-established techniques for extracting the reduced scattering and absorption coefficients. We have performed a comparison study of the performance of a spatially resolved and a time-resolved instrument at wavelengths 660 and 785 nm and also of an integrating-sphere setup at 550-800 nm. The first system records the diffuse reflectance from a diode laser by means of a fiber bundle probe in contact with the sample. The time-resolved system utilizes picosecond laser pulses and a single-photon-counting detection scheme. We extracted the optical properties by calibration using known standards for the spatially resolved system, by fitting to the diffusion equation for the time-resolved system, and by using an inverse Monte Carlo model for the integrating sphere. The measurements were performed on a set of solid epoxy tissue phantoms. The results showed less than 10% difference in the evaluation of the reduced scattering coefficient among the systems for the phantoms in the range 9-20 cm(-1), and absolute differences of less than 0.05 cm(-1) for the absorption coefficient in the interval 0.05-0.30 cm(-1). (C) 2003 Optical Society of America.
Avdelning/ar
Publiceringsår
2003
Språk
Engelska
Sidor
4612-4620
Publikation/Tidskrift/Serie
Applied Optics
Volym
42
Issue
22
Fulltext
- Available as PDF - 149 kB
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Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Optical Society of America
Ämne
- Atom and Molecular Physics and Optics
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 2155-3165