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
Bidirectional scattering distribution function measurements from volume diffusers: correction factors and associated uncertainties.
TL;DR: This work derives expressions for correction factors that can be used when the reduced scattering coefficients and the index of refraction are known and uses them to guide the assessment of measurement uncertainty.
Journal ArticleDOI
Characterization of bulk optical properties of pear tissues in the 500 to 1000 nm range as input for simulation-based optimization of laser spectroscopy in diffuse transmittance mode
TL;DR: In this article , the authors quantified the bulk optical properties (BOP) of skin, outer cortex, inner cortex, and core tissue of three pear (Pyrus communis) cultivars (Thimo, Cepuna, and Conference) using double integrating spheres measurements in combination with the inverse adding doubling method.
Journal ArticleDOI
Calibration of Spectral Imaging Devices With Oxygenation-Controlled Phantoms: Introducing a Simple Gel-Based Hemoglobin Model
TL;DR: Gel-based phantoms using Agarose, polystyrene microsphere, purified hemoglobin and yeast are developed with stable oxygen saturation (StO2) and optical properties (OPs) and a robust fitting algorithm was used to extract StO2.
Journal ArticleDOI
Multimodal hyperspectral fluorescence and spatial frequency domain imaging for tissue health diagnostics of the oral cavity.
Ben E. Urban,Hrebesh M. Subhash +1 more
TL;DR: A multimodal, hyperspectral imaging system was built for diagnostics of oral tissues as discussed by the authors, which combines the principles of spatial frequency domain imaging, quantitative light fluorescence, and CIELAB color measurement.
Proceedings ArticleDOI
Soft optically tuneable fluorescence phantoms based on gel wax and quantum dots: a tissue surrogate for fluorescence imaging validation
Yijing Xie,Efthymios Maneas,Shahraz Islam,William J. Peveler,Jonathan Shapey,Wenfeng Xia,Sebastien Ourselin,Ivan P. Parkin,Adrien E. Desjardins,Tom Vercauteren +9 more
TL;DR: In this paper, a soft tissue-mimicking fluorescence phantoms (TMFP) was developed for brain tumor resection, which is based on gel-wax which is an optically transparent mineral-oil based soft material.
References
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Journal ArticleDOI
A simplex method for function minimization
John A. Nelder,R. Mead +1 more
TL;DR: A method is described for the minimization of a function of n variables, which depends on the comparison of function values at the (n 41) vertices of a general simplex, followed by the replacement of the vertex with the highest value by another point.
Book
Introduction to Numerical Analysis
Josef Stoer,Roland Bulirsch +1 more
TL;DR: This well written book is enlarged by the following topics: B-splines and their computation, elimination methods for large sparse systems of linear equations, Lanczos algorithm for eigenvalue problems, implicit shift techniques for theLR and QR algorithm, implicit differential equations, differential algebraic systems, new methods for stiff differential equations and preconditioning techniques.
Journal ArticleDOI
A review of the optical properties of biological tissues
TL;DR: The known optical properties (absorption, scattering, total attenuation, effective attenuation and/or anisotropy coefficients) of various biological tissues at a variety of wavelengths are reviewed in this article.
Journal ArticleDOI
New contributions to the optics of intensely light-scattering materials.
TL;DR: In this paper, the Gurevic and Judd formulas were derived from the Kubelka-Munk differential equations, and they are exact under the same conditions as in this paper, that is, when the material is perfectly dull and when the light, is perfectly diffused or if it is parallel and hits the specimen under an angle of 60° from normal.