Determination of the optical penetration depth in tissues

The wavelengths data for nm and nm, chosen instead, are close to these absorption bands and may give an overall comparative impression of the scale of light propagation and absorption phenomena Figure The Lipometer operates withe LEDs at a wavelength of nm and with a single photodiode [21]. In clinic settings, the tissue optical properties are often heterogeneous, thus one needs to further account for the effect of tissue heterogeneity by solving the diffusion equation Eq. Figure 6 shows that the reduced scattering coefficient decreases with wavelength increasing, which, in general, corresponds to spectral behaviour of the scattering characteristics of most of tissues [ 5 , 37 , 39 ]. For realization of identical phantom samples an additional vessel was used for mixing the components four forms were cast with the resulting mixture. The reflectivity with known , the reflectivity of the detector and the other sphere properties are calculated from Equation 5.
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The optical penetration depth, delta [cm]

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Near-infrared window in biological tissue

This page was last edited on 1 April , at See other articles in PMC that cite the published article. Absorbance spectrum of the Intralipid test series Dermalog software. In that way, possible real light losses in the transversal direction could be modeled. Baranoski G, Krishnaswamy A Light and skin interactions: The tissue optical properties, in turn, are influenced by the concentration of photosensitizer and the concentration and oxygenation of the blood.
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Optical Properties of Aorta

Components of the tissue have the following refractive indices: For all of these methods very expensive equipment or specialized methodical know-how is necessary. This energy density matrix is used with a factor of total energy output within this defined area [ 24 , 25 ]. From a linear fit, the collimated transmittance can be determined. Figure 6 provides a more detailed representation of the wavelength-dependent penetration within the epidermis and the epidermal-dermal boundary. A method for noninvasive determination of fat and water content in the human body is examined. Latex sheaths with Intralipid-water mixtures.
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Unfortunately such data for the exact absorption wavelengths of fat, water and myoglobin were not available. To find out more, see our Privacy and Cookies policy. The samples of human cranial bone were obtained from postmortem examinations. This method combines measurements using two integrating spheres combined with a few system parameters in order to calculate optical properties of the sample. For each subgroup the photons are computed in the second loop. Below, the total concentration of hemoglobin is assumed to be 2.
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