Estimation of Absorbing Components in a Local Layer Embedded in the Turbid Media on the Basis of Visible to Near- Infrared (VIS-NIR) Reflectance Spectra

Nishidate, Izumi; Aizu, Yoshihisa; Mishina, Hiromichi

doi:10.1007/s10043-003-0427-7

Cited by 24 publications

(14 citation statements)

References 24 publications

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“…The optical parameters of μ s (λ) and μ a (λ) for the phantom were determined by the inverse Monte Carlo method for measured diffuse reflectance and total transmittance. 8,30,31 Optical properties for the skin tissue phantoms estimated by the inverse Monte Carlo method are shown in Figure 5. The refractive index n for each layer was assumed to be 1.33 at three wavelengths.…”

Section: Experiments Using Phantomsmentioning

confidence: 99%

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Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

et al. 2011

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Section: Experiments Using Phantomsmentioning

confidence: 99%

“…The optical parameters for the phantom were reported previously. 8,30,31 Before measurement, the four sides of the dermis layer were surrounded with saline, as shown in Fig. 3(b).…”

Section: Experiments Using Phantomsmentioning

confidence: 99%

Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

et al. 2011

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“…The spectral response of the normal and diseased skin can be analyzed for hidden variables such as erythema index, oxygen saturation, dermal blood volume, and concentration of various chromophores in the skin [3][4][5][6][7] . Point spectrometers measure spectral response as a single point on the body.…”

Section: Introductionmentioning

confidence: 99%

Bruise chromophore concentrations over time

et al. 2008

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During investigations of potential child and elder abuse, clinicians and forensic practitioners are often asked to offer opinions about the age of a bruise. A commonality between existing methods of bruise aging is analysis of bruise color or estimation of chromophore concentration. Relative chromophore concentration is an underlying factor that determines bruise color. We investigate a method of chromophore concentration estimation that can be employed in a handheld imaging spectrometer with a small number of wavelengths. The method, based on absorbance properties defined by Beer-Lambert's law, allows estimation of differential chromophore concentration between bruised and normal skin. Absorption coefficient data for each chromophore are required to make the estimation. Two different sources of this data are used in the analysis-generated using Independent Component Analysis and taken from published values. Differential concentration values over time, generated using both sources, show correlation to published models of bruise color change over time and total chromophore concentration over time.

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“…With the modified MCML, we executed the cMCS and phase 1 of the sLWMCS and gLWMCS. The number of photons for each condition was 10 5 [20]. For the standard condition for the skin model, the incident angle was set to 0°, and the reflectance was integrated over all exit angles.…”

Section: Mcsmentioning

confidence: 99%

Rapid calculation of diffuse reflectance from a multilayered model by combination of the white Monte Carlo and adding-doubling methods

Yoshida

Nishidate

2014

Biomed. Opt. Express

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Abstract:To rapidly derive a result for diffuse reflectance from a multilayered model that is equivalent to that of a Monte-Carlo simulation (MCS), we propose a combination of a layered white MCS and the addingdoubling method. For slabs with various scattering coefficients assuming a certain anisotropy factor and without absorption, we calculate the transition matrices for light flow with respect to the incident and exit angles. From this series of precalculated transition matrices, we can calculate the transition matrices for the multilayered model with the specific anisotropy factor. The relative errors of the results of this method compared to a conventional MCS were less than 1%. We successfully used this method to estimate the chromophore concentration from the reflectance spectrum of a numerical model of skin and in vivo human skin tissue.

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Estimation of Absorbing Components in a Local Layer Embedded in the Turbid Media on the Basis of Visible to Near- Infrared (VIS-NIR) Reflectance Spectra

Cited by 24 publications

References 24 publications

Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

Bruise chromophore concentrations over time

Rapid calculation of diffuse reflectance from a multilayered model by combination of the white Monte Carlo and adding-doubling methods

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