Photoplethysmography- fundamental aspects of the optical properties of blood in motion

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  • V.C. Roberts
    Biomedical Engineering Department, King's College Hospital Medical School, Denmark Hill, London SE5

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<jats:p>This paper outlines a simplified theory to explain the behaviour of photoelectric plethysmographs used for the measurement of blood flow in the skin. The paper reports the finding that light diffusing through blood, from a source outside a blood vessel, can diffuse preferentially in the direction of motion of the blood, and that this preferential diffusion is likely to arise from a combination of the plasma skimming which occurs at the vessel wall and from the orientation effects of the erythrocytes in motion.</jats:p>

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