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Proceedings Paper

Influence of multiple scattering effects on in vivo NIR spectroscopy
Author(s): Chongwu Du; Werner Nahm
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Paper Abstract

On the basis of both homogeneous and layered skin models this paper analyzes the influences of multiple scattering of skin on the measurements of NIR spectroscopy. Emphasis is laid on the wavelengths of 660, 805, and 940 nm which are used in clinical monitoring systems. The results of Monte-Carlo simulation show that the overwhelming scattering of tissue leads to a nonlinearity in the Lambert-Beer's relation between optical density and chromophore concentration. The consequences of this effect shall be discussed using as an example the non invasive measurement of Indocyanine Green (ICG) in the blood. In this case the multiple scattering of skin causes substantial non-linear relation between the optical density at 805 nm and the concentration of an injected NIR dye in the blood if the concentration of ICG exceeds 10 mg/l. This leads to a significant distortion of the ICG clearance curve and in consequence to a systematic error in the determination of physiological parameters. For multi-wavelength spectroscopy the wavelength dependency of scattering coefficients has to be noticed. The consequence of this effect is demonstrated for blood oxygen saturation (SaO2) measurements.

Paper Details

Date Published: 31 January 1995
PDF: 12 pages
Proc. SPIE 2326, Photon Transport in Highly Scattering Tissue, (31 January 1995); doi: 10.1117/12.200834
Show Author Affiliations
Chongwu Du, Medizinische Univ. Luebeck (Germany)
Werner Nahm, Medizinische Univ. Luebeck (Germany)


Published in SPIE Proceedings Vol. 2326:
Photon Transport in Highly Scattering Tissue

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