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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 7 — Mar. 1, 1996
  • pp: 1151–1160

Why do veins appear blue? A new look at an old question

Alwin Kienle, Lothar Lilge, I. Alex Vitkin, Michael S. Patterson, Brian C. Wilson, Raimund Hibst, and Rudolf Steiner  »View Author Affiliations


Applied Optics, Vol. 35, Issue 7, pp. 1151-1160 (1996)
http://dx.doi.org/10.1364/AO.35.001151


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Abstract

We investigate why vessels that contain blood, which has a red or a dark red color, may look bluish in human tissue. A CCD camera was used to make images of diffusely reflected light at different wavelengths. Measurements of reflectance that are due to model blood vessels in scattering media and of human skin containing a prominent vein are presented. Monte Carlo simulations were used to calculate the spatially resolved diffuse reflectance for both situations. We show that the color of blood vessels is determined by the following factors: (i) the scattering and absorption characteristics of skin at different wavelengths, (ii) the oxygenation state of blood, which affects its absorption properties, (iii) the diameter and the depth of the vessels, and (iv) the visual perception process.

© 1996 Optical Society of America

History
Original Manuscript: March 3, 1995
Revised Manuscript: September 28, 1995
Published: March 1, 1996

Citation
Alwin Kienle, Lothar Lilge, I. Alex Vitkin, Michael S. Patterson, Brian C. Wilson, Raimund Hibst, and Rudolf Steiner, "Why do veins appear blue? A new look at an old question," Appl. Opt. 35, 1151-1160 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-7-1151


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