Journal ArticleDOI
Determining the optical properties of turbid media by using the adding–doubling method
TLDR
A method is described for finding the optical properties of a slab of turbid material by using total reflection, unscattered transmission, and total transmission measurements and the intrinsic error in the method is < 3% when four quadrature points are used.Abstract:
A method is described for finding the optical properties (scattering, absorption, and scattering anisotropy) of a slab of turbid material by using total reflection, unscattered transmission, and total transmission measurements. This method is applicable to homogeneous turbid slabs with any optical thickness, albedo, or phase function. The slab may have a different index of refraction from its surroundings and may or may not be bounded by glass. The optical properties are obtained by iterating an adding–doubling solution of the radiative transport equation until the calculated values of the reflection and transmission match the measured ones. Exhaustive numerical tests show that the intrinsic error in the method is <3% when four quadrature points are used.read more
Citations
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Journal ArticleDOI
Optical properties of human skin, subcutaneous and mucous tissues in the wavelength range from 400 to 2000 nm
TL;DR: In this article, the optical properties of human skin, subcutaneous adipose tissue and human mucosa were measured in the wavelength range 400-2000 nm using a commercially available spectrophotometer with an integrating sphere.
Journal ArticleDOI
Quantitative optical spectroscopy for tissue diagnosis
TL;DR: This review describes optical interactions pursued for biomedical applications (fluorescence, fluorescence lifetime, phosphorescence, and Raman from cells, cultures, and tissues) and provides a descriptive framework for light interaction based upon tissue absorption and scattering properties.
Journal ArticleDOI
Near-infrared optical properties of ex vivo human skin and subcutaneous tissues measured using the Monte Carlo inversion technique
TL;DR: The absorption and transport scattering coefficients of c Caucasian and negroid dermis, subdermal fat and muscle have been measured for all wavelengths between 620 and 1000 nm and the optical properties of caucasian dermis were found to be approximately twice those of the underlying fat layer.
Journal ArticleDOI
Optical properties of skin, subcutaneous, and muscle tissues: a review
TL;DR: An overview of published absorption and scattering properties of skin and subcutaneous tissues measured in wide wavelength range is presented and basic principles of measurements of the tissue optical properties and techniques used for processing of the measured data are outlined.
Journal ArticleDOI
Optical properties of human skin in the near infrared wavelength range of 1000 to 2200 nm.
TL;DR: From the measured optical properties, it was found that a 2% Intralipid solution provides a suitable skin tissue phantom and in vitro results show that values for mua) follow 70% of the absorption coefficient of water.
References
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Journal ArticleDOI
Determination of optical properties of turbid media using pulsed photothermal radiometry
TL;DR: An analytic theory for the time dependence of the PPTR signal in semi-infinite scattering and absorbing media has been derived and tested in a series of controlled gel phantoms and is shown to model the time course of the detected signal accurately.
Journal ArticleDOI
Accuracies of the diffusion approximation and its similarity relations for laser irradiated biological media
TL;DR: In general, fluxes can be computed more accurately with the diffusion approximation than fluence rates, and for anisotropic scattering, better results can be obtained by simple transforms of optical coefficients using the similarity relations.
Proceedings ArticleDOI
Quantitative Reflectance Spectrophotometry For The Noninvasive Measurement Of Photosensitizer Concentration In Tissue During Photodynamic Therapy
TL;DR: In this paper, a simple model of light propagation which allows quantitative prediction of the sensitivity of a photo-sensor was proposed, based on optical absorption and scattering coefficients obtained from two non-invasive measurements: the total diffuse reflectance and the spatial variation of local diffuse reflectances.
Journal ArticleDOI
Determination of absorption and scattering coefficients for nonhomogeneous media. 1: theory.
TL;DR: The equations are sufficiently simple to be used for spectroscopic determination of the absorption and scattering coefficients and show very good agreement for all cases except for reflectance in the highly anisotropic case, where agreement is only fair.
Journal ArticleDOI
Indirect versus direct techniques for the measurement of the optical properties of tissues
TL;DR: Two classes of technique may be used: indirect methods in which the properties are deduced from measurements of bulk tissue properties, and direct, model‐free measurements using optically thin tissue samples.